I do like the VID design, but here are a few things I thought of:
If you don’t have an aversion to using a PLD, a small GAL like a 16V8 might be useful for decoding and would still be period-appropriate. There are several “new” designs in both the Retrobrew S100 and ECB designs that use them,
and they’re still available online from secondary suppliers or eBay.
For the RAM, if you don’t need 128k, I might consider something like a Cypress 32kx8 which is in a 0.300” DIP28 (rather than the normal 0.600”). That saves some space.
Rich
Get
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Richard Cini wrote:
>
>
> The 9958 is a weird DIP packaging so maybe the 9918. The Retrobrew Computers N8 Home Computer uses it. Looks like the VDP, RAM, three buffer chips and some decoding.
Thanks Rich,
Designing video was "hard" back in the 70s/80s, so there were lots of
specialized controller chips for people eager to get something out the
door quickly. The Motorola 6845 was popular, but each IC manufacturer
had their own. Intel had the 8275/76, RCA had the 1861, TI had the 9958
and 9918, etc.
They all work, but have also become rare and expensive today. I hesitate
to design something with one, unless I have a bucket of them.
So, I'm inclined to follow in the footsteps of Woz, Sinclair, Lancaster,
and other designers who used clever circuits to produce video with
standard chips. I've attached two of my "brainstorms" in this path:
Z80-VID.PDF has 12 ICs, outputs 384x192 pixel NTSC/PAL video (enough for
24 lines of 64 characters), 128K RAM, PS2 keyboard interface, SPI, and a
bit-banger serial port. It's an accessory board for the Z80MC, (kind of
equuivalent to the Z80-SIO), and multiplexes the RAM between Z80 and
video, so the Z80 does not stop while video is being output.
Z80-VIP.PDF has 11 ICs, outputs the same video, but is a complete
free-standing "terminal". It has its own Z80, 32K RAM, 32K EPROM, UART
serial port, and switch matrix keyboard. It uses the Z80's BUSRQ/BUSAK
signals to stop the Z80 while video is being output (so the Z80 runs at
about 25% speed). It's patterned after my 1802 VIP2K
<>, and uses a simple state machine
(counter/EPROM/latch) to create the video.
But both lack "elegance", and have too many parts to fit on an Altoids
card. I could obviously use a bigger board; but keep "scheming" in case
there's a way...
Lee Hart
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
???????? -- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377,
|
Hi Mark, Thanks for checking your stock.? I will let Lee contact you off line, since he's the one who stocks and kits the kits. I believe I can say "kits the kits"... both a verb and noun right?? LIke who's gonna kid a kid? If you need any help or advice on RS-485, please don't hesitate to ask me.? I'm practically an expert on that subject! Isolating the RS-485 is definitely a good plan.? I hope you are using 3 wires for the bus (A, B and Ground).
On Tuesday, July 28, 2020, 2:40:12 PM EDT, Mark Moulding <mark@...> wrote:
Actually, I'm already doing a re-spin of the product, to make it more environmentally robust, use a better A-D converter (the one I'm using now has caused many problems), and fully isolate an RS-485 interface.? I'll still need to produce a limited number of my existing design, in order to support spares for existing installations, but in the future I'll "mass"-produce only the newer version.
So, although it wasn't my original intention, I'll see what I can do about changing to a more off-the-shelf display.? A quick perusal of DigiKey doesn't turn up *any* 7- or 8-digit displays, and the 4-digit ones start at about twice the size (and twice the price, and I'd need two), but I'll keep looking.
In the meantime, if a smaller quantity would help out, I'm sure I can spare a few (or a few dozen, probably - I'll check my stock the next time i get to my warehouse). Contact me off-list and we can work out the details.
~~
Mark Moulding
|
Actually, I'm already doing a re-spin of the product, to make it more environmentally robust, use a better A-D converter (the one I'm using now has caused many problems), and fully isolate an RS-485 interface.? I'll still need to produce a limited number of my existing design, in order to support spares for existing installations, but in the future I'll "mass"-produce only the newer version.
So, although it wasn't my original intention, I'll see what I can do about changing to a more off-the-shelf display.? A quick perusal of DigiKey doesn't turn up *any* 7- or 8-digit displays, and the 4-digit ones start at about twice the size (and twice the price, and I'd need two), but I'll keep looking.
In the meantime, if a smaller quantity would help out, I'm sure I can spare a few (or a few dozen, probably - I'll check my stock the next time i get to my warehouse). Contact me off-list and we can work out the details.
~~
Mark Moulding
|
Actually, I'm already using the MAX7219, because it does save so much work and there are easily-available libraries to drive it.? The reason I liked the display I'm using is that it's the right size (about 1-1/2" / 35mm wide), and has some separate indicator LEDs built in.? If they do run out, I'll just plant some smaller 4-digit displays directly on the board, along with some separate indicators.? This is all inside a chassis anyway, used for setup, configuration, and calibration, so it doesn't need to meet up with a fancy front panel.
One of the advantages of providing niche products is that they're not particularly sensitive to component pricing; most of the unit price goes to amortize the original engineering.? In most cases, there simply isn't a competitive product available, and other ways of accomplishing the customer's job are far more expensive, so everybody wins.
Thanks for the pointer to this display, though - having a couple of these around for quick knock-together projects could be pretty handy!
~~
Mark Moulding
|
Mark,??
Can your product handle an 85mm wide display?? Here's what is very popular and inexpensive on ebay. 8 digit, bright blue display (unlike the hard to read red displays), with MAX7219 chip to take away the complexity of a multiplex display and handles the constant current. SPI interface with only 5 wires (not sure why so many.. I would have thought 2 should be enough).
Not sure where $1.69 fits in your price point?? But these are production LED modules that will never run out.
On Sunday, July 26, 2020, 03:19:02 p.m. EDT, Mark Moulding <mark@...> wrote:
Lee, I probably caused the availability problem with the original display you were using.? I found that to be a really neat display, so I designed it into a specialized low-volume product I produce for a client, and to ensure enough stock, I bought all they had (about 1,100 of them).? I figure that once that supply is exhausted, the product will have made enough profit to justify re-spinning the board for a new display.? I did the same with the user-interface buttons I'm using, too.
This may not seem like a particularly sound practice for a real commercial product, but it's worked out well for me; if I guess right about the projected quantity, it can save quite a lot of money.? There's certainly plenty of precedent: Many of the 70s- and 80s-era home computer kits used this model, as did (and still do) many of the "boutique" audio and musical instrument manufacturers.
~~
Mark Moulding
|
Hi Mark,
They are definitely a cute display.? But they are just about the only kind of display that fits inside the Altoids tin.? Does your product need to be small?? Perhaps before the 1100 are used up, I/we can help you migrate to another display?? The 6502 Badge can also migrate to another display, but the Z80MC is kind of dead in the water without a small enough display.
Cheers,
Josh
On Sunday, July 26, 2020, 03:19:02 p.m. EDT, Mark Moulding <mark@...> wrote:
Lee, I probably caused the availability problem with the original display you were using.? I found that to be a really neat display, so I designed it into a specialized low-volume product I produce for a client, and to ensure enough stock, I bought all they had (about 1,100 of them).? I figure that once that supply is exhausted, the product will have made enough profit to justify re-spinning the board for a new display.? I did the same with the user-interface buttons I'm using, too.
This may not seem like a particularly sound practice for a real commercial product, but it's worked out well for me; if I guess right about the projected quantity, it can save quite a lot of money.? There's certainly plenty of precedent: Many of the 70s- and 80s-era home computer kits used this model, as did (and still do) many of the "boutique" audio and musical instrument manufacturers.
~~
Mark Moulding
|
Mark Moulding wrote: Lee, I probably caused the availability problem with the original
display you were using. I found that to be a really neat display, so I
designed it into a specialized low-volume product I produce for a
client, and to ensure enough stock, I bought all they had (about 1,100
of them). Hi Mark, Aha! So THAT's where they all went! When we designed the badge, I ordered a couple hundred for the VCFMW show and follow-on orders. These were quickly gone; but when I tried to order more, MPJA said they were all sold. That was the "end" of the 6502 badges. Luckily, I still had a couple boxes set aside for the Z80MC. Otherwise, I would have been out of business on it as well. Then last year, one of the VCFMW guys (Mike Lee) found some more on ebay. So we were able to make another batch of badges for the show. I still have ~30 left, so the 6502 badges are currently available again. (Just don't buy 'em all). Lee Hart -- A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. -- Antoine de Saint Exupery -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
smmccown@... wrote: Do you have a datasheet or part number for the replacement LED display?
I would like to read about it. I bought them on ebay. No data sheet or manufacturer's name. It's marked 72R02PHIL, date code T9718. Lee Hart -- A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. -- Antoine de Saint Exupery -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
Richard Cini wrote:
The 9958 is a weird DIP packaging so maybe the 9918. The Retrobrew Computers N8 Home Computer uses it. Looks like the VDP, RAM, three buffer chips and some decoding.
Thanks Rich, Designing video was "hard" back in the 70s/80s, so there were lots of specialized controller chips for people eager to get something out the door quickly. The Motorola 6845 was popular, but each IC manufacturer had their own. Intel had the 8275/76, RCA had the 1861, TI had the 9958 and 9918, etc. They all work, but have also become rare and expensive today. I hesitate to design something with one, unless I have a bucket of them. So, I'm inclined to follow in the footsteps of Woz, Sinclair, Lancaster, and other designers who used clever circuits to produce video with standard chips. I've attached two of my "brainstorms" in this path: Z80-VID.PDF has 12 ICs, outputs 384x192 pixel NTSC/PAL video (enough for 24 lines of 64 characters), 128K RAM, PS2 keyboard interface, SPI, and a bit-banger serial port. It's an accessory board for the Z80MC, (kind of equuivalent to the Z80-SIO), and multiplexes the RAM between Z80 and video, so the Z80 does not stop while video is being output. Z80-VIP.PDF has 11 ICs, outputs the same video, but is a complete free-standing "terminal". It has its own Z80, 32K RAM, 32K EPROM, UART serial port, and switch matrix keyboard. It uses the Z80's BUSRQ/BUSAK signals to stop the Z80 while video is being output (so the Z80 runs at about 25% speed). It's patterned after my 1802 VIP2K <>, and uses a simple state machine (counter/EPROM/latch) to create the video. But both lack "elegance", and have too many parts to fit on an Altoids card. I could obviously use a bigger board; but keep "scheming" in case there's a way... Lee Hart -- A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. -- Antoine de Saint Exupery -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
Found this... The 9958 is a weird DIP packaging so maybe the 9918. The Retrobrew Computers N8 Home Computer uses it. Looks like the VDP, RAM, three buffer chips and some decoding. Rich -- Rich Cini ?On 7/26/20, 2:44 PM, "Lee Hart" < [email protected] on behalf of leeahart@...> wrote: Richard Cini wrote: > Lee -- I know decidedly unvintage, but you can use an ATMEGA88 as a composite > color video chip... Of course I can. *Any* modern micro can generate video. For that matter, there are many little boards I can buy that do it all for me. Nothing to design, no software to write. But what's the fun in that? :-) I guess it's like doing a jigsaw puzzle. You could just buy the finished picture; no assembly required. But the fun is in the assembly. And for me, the fun is in the design. Not the modern "beat every problem to death with a sledgehammer" approach, but rather the Dr. Dobbs "running light without overbyte" philosophy. So, I set a hard goal for myself, and then see if I can achieve it. How simple can it be and still do the job? For inspiration, I look back on things like the Heathkit H19 terminal (1979), Sinclair ZX80 (1980), and Voja Antonic's Galaksija computers (1982). They all used a Z80 with minimal vintage hardware to produce a terminal with keyboard and video. There are also Don Lancaster's "cheap video" tricks, which mostly centered on the 6502. I have several designs that *almost* fit on an Altoids size card. But none have quite given me that "aha" moment yet. Lee Hart -- "We do these things not because they are easy; but because they are hard." -- President Jack Kennedy, on the Apollo moon mission -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
Hi Lee,
Do you have a datasheet or part number for the replacement LED display?? I would like to read about it.
Thanks, Steve
|
Lee, I probably caused the availability problem with the original display you were using.? I found that to be a really neat display, so I designed it into a specialized low-volume product I produce for a client, and to ensure enough stock, I bought all they had (about 1,100 of them).? I figure that once that supply is exhausted, the product will have made enough profit to justify re-spinning the board for a new display.? I did the same with the user-interface buttons I'm using, too.
This may not seem like a particularly sound practice for a real commercial product, but it's worked out well for me; if I guess right about the projected quantity, it can save quite a lot of money.? There's certainly plenty of precedent: Many of the 70s- and 80s-era home computer kits used this model, as did (and still do) many of the "boutique" audio and musical instrument manufacturers.
~~
Mark Moulding
|
I was thinking in the context of bang-for-buck more so than the Woz kind of challenge. Most video designs I’ve seen (post Don) use a CRTC like the 6845 or something close. I think they need too many support chips to fit. There are
a couple others on S100 that use TTL but that’s a lot of chips. Same with the TMS9918 used in the MSX and I’m guessing TI designs.
How about something from the Apple I or the Elf? I’m sure you’ve looked at those already, though, and the chips are hard to get if I remember. I’ll page around my archive and see what else I can find.
Get
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Show quoted text
Richard Cini wrote:
> Lee -- I know decidedly unvintage, but you can use an ATMEGA88 as a composite
> color video chip...
Of course I can. *Any* modern micro can generate video. For that matter,
there are many little boards I can buy that do it all for me. Nothing to
design, no software to write. But what's the fun in that? :-)
I guess it's like doing a jigsaw puzzle. You could just buy the finished
picture; no assembly required. But the fun is in the assembly.
And for me, the fun is in the design. Not the modern "beat every problem
to death with a sledgehammer" approach, but rather the Dr. Dobbs
"running light without overbyte" philosophy.
So, I set a hard goal for myself, and then see if I can achieve it. How
simple can it be and still do the job?
For inspiration, I look back on things like the Heathkit H19 terminal
(1979), Sinclair ZX80 (1980), and Voja Antonic's Galaksija computers
(1982). They all used a Z80 with minimal vintage hardware to produce a
terminal with keyboard and video. There are also Don Lancaster's "cheap
video" tricks, which mostly centered on the 6502.
I have several designs that *almost* fit on an Altoids size card. But
none have quite given me that "aha" moment yet.
Lee Hart
--
"We do these things not because they are easy; but because they are
hard." -- President Jack Kennedy, on the Apollo moon mission
? --
Lee Hart, 814 8th Ave N, Sartell MN 56377,
|
Richard Cini wrote: Lee -- I know decidedly unvintage, but you can use an ATMEGA88 as a composite
color video chip... Of course I can. *Any* modern micro can generate video. For that matter, there are many little boards I can buy that do it all for me. Nothing to design, no software to write. But what's the fun in that? :-) I guess it's like doing a jigsaw puzzle. You could just buy the finished picture; no assembly required. But the fun is in the assembly. And for me, the fun is in the design. Not the modern "beat every problem to death with a sledgehammer" approach, but rather the Dr. Dobbs "running light without overbyte" philosophy. So, I set a hard goal for myself, and then see if I can achieve it. How simple can it be and still do the job? For inspiration, I look back on things like the Heathkit H19 terminal (1979), Sinclair ZX80 (1980), and Voja Antonic's Galaksija computers (1982). They all used a Z80 with minimal vintage hardware to produce a terminal with keyboard and video. There are also Don Lancaster's "cheap video" tricks, which mostly centered on the 6502. I have several designs that *almost* fit on an Altoids size card. But none have quite given me that "aha" moment yet. Lee Hart -- "We do these things not because they are easy; but because they are hard." -- President Jack Kennedy, on the Apollo moon mission -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
Lee -- I know decidedly unvintage, but you can use an ATMEGA88 as a composite color video chip. I use it on my 6502 SBC. It needs an oscillator (16MHz), two resistors, the chip and an RCA jack (or flying leads to an RCA jack). There are VGA solutions too, using for example the Propeller chip. Take a look at the board from S100Computers. Obviously you can cut a lot out of the design (like decoding and port selection, the LED displays, etc.). Rich -- Rich Cini ?On 7/26/20, 1:31 PM, "Lee Hart" < [email protected] on behalf of leeahart@...> wrote: ajparent1/kb1gmx wrote: > Thump thump.. testing 123 test test... > IS there any life or is it dead? Hi Allison, It's alive; just sleepy. Too many distractions, I guess. Let me see... what have I been doing with the Z80MC lately? 1. The 7-digit LED display has become hard to get. I found a replacement, with green 7-segment LEDs. It's also a surplus part, but I got enough to last a while; so I can keep producing kits for the forseeable future. Physically, it has wire leads instead of pins (they have to be bent slightly to fit the holes in the PCB) and lacks the "steps" in the corners of the old red LED display. That's it in the picture of the Front Panel card on my web page <>. 2. I changed the LED-photoresisor optocoupler (used to control the piezo speaker) to a standard LED-phototransistor part. It added a resistor (and I always fight to minimize parts), but it's a standard part and so easier to get. 3. I made a few improvements to the CPU board: - I flipped the 5v regulator upside down, so its metal tab faces *away* from the PCB; this provides better cooling. - It also made room to add a 6-pin power/serial header (same as on the Front Panel card). Use this header with a USB-serial cable run the CPU board "barefoot" (without any other cards). The plan is to sell the CPU board by itself for half the price, for any little Z-duino projects you may have. - I added jumper options to put BUSAK and BUSRQ on the bus in case they're needed. but there's an error in the silkscreen; the HALT and BUSAK are swapped. I'll fit it in the next batch of PCBs. 4. I've been "scheming" for a way to add a video/keyboard "terminal" card. I have several designs, none of which I'm entirely happy with. We can discuss them if anyone's interested. 5. A customer found a bug in the Dunfield BASIC; it can crash when handling strings. I haven't had time to track this one down yet. Anybody? What have YOU been doing with the Z80MC? Lee Hart -- If happiness is on your mind, here's a daily list to find: - something to do - something to look forward to - someone to love - someone to take good care of - and misbehave, just a little -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
ajparent1/kb1gmx wrote: Thump thump.. testing 123 test test...
IS there any life or is it dead? Hi Allison, It's alive; just sleepy. Too many distractions, I guess. Let me see... what have I been doing with the Z80MC lately? 1. The 7-digit LED display has become hard to get. I found a replacement, with green 7-segment LEDs. It's also a surplus part, but I got enough to last a while; so I can keep producing kits for the forseeable future. Physically, it has wire leads instead of pins (they have to be bent slightly to fit the holes in the PCB) and lacks the "steps" in the corners of the old red LED display. That's it in the picture of the Front Panel card on my web page <>. 2. I changed the LED-photoresisor optocoupler (used to control the piezo speaker) to a standard LED-phototransistor part. It added a resistor (and I always fight to minimize parts), but it's a standard part and so easier to get. 3. I made a few improvements to the CPU board: - I flipped the 5v regulator upside down, so its metal tab faces *away* from the PCB; this provides better cooling. - It also made room to add a 6-pin power/serial header (same as on the Front Panel card). Use this header with a USB-serial cable run the CPU board "barefoot" (without any other cards). The plan is to sell the CPU board by itself for half the price, for any little Z-duino projects you may have. - I added jumper options to put BUSAK and BUSRQ on the bus in case they're needed. but there's an error in the silkscreen; the HALT and BUSAK are swapped. I'll fit it in the next batch of PCBs. 4. I've been "scheming" for a way to add a video/keyboard "terminal" card. I have several designs, none of which I'm entirely happy with. We can discuss them if anyone's interested. 5. A customer found a bug in the Dunfield BASIC; it can crash when handling strings. I haven't had time to track this one down yet. Anybody? What have YOU been doing with the Z80MC? Lee Hart -- If happiness is on your mind, here's a daily list to find: - something to do - something to look forward to - someone to love - someone to take good care of - and misbehave, just a little -- Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
|
I attached a picture (not sure if the forum software allows it, but let’s give it a shot). I think there was a thread on this a while ago, but basically it’s two parts. ? First, a 2000mAH LiPo battery and power/charger module and second, a Bluetooth BLE module. The power module (Adafruit PowerBoost 1000C) has a charger input (with voltage pass-through so you can use the device when charging), a JST battery connector, power switch and power output pins (in the form of a USB A footprint; no jack installed). 5V power from the power board connects to an Adafruit BlueFruit BLE module (used for Arduino projects I suspect). This module has standard serial RX/TX CTS/RTS pins. Power and serial signals are then wired to a 0.1” 1x6 Molex-style connector which then connects to header P1 on the front panel board. All of these are mounted in an insulated Altoids tin which can sit in the lid of the tin holding the Z80MC. ? I got tired of having a serial cable dangling on my desk so this makes it way easier to use. ? ? ?
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On 7/25/20, 3:24 PM, "Bill in OKC too via groups.io" < [email protected] on behalf of wmrmeyers@...> wrote: Can we have some details here? I did this stuff back in the late 70's and early 80's, but got into appliance computers when the TRS-80 Model 1, Level 1 came out. Something about releasing the magic smoke from my Cosmac Elf. I'm pretty good with cookbooks, not so much DIY. I can build a mean PC, but that's just assembly. Any mechanic can do it.? William R. Meyers, MSgt, USAF(Ret.) A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein) ? On Saturday, July 25, 2020, 02:08:21 PM CDT, Richard Cini <rich.cini@...> wrote: Here’s something for the group. One project I did was to make it wireless/portable. I have a LiOH battery, charger board and Bluetooth LE module (all from Adafruit) mounded in a second Altoids box. The new version of Serial (term emulator for OSX) can connect to the BLE module. So totally portable and wireless CPM fun.
comatose, but probably not dead. I just retired again, and I've been too busy to play with anything but SWMBO's Honey Do list. ;) OTH, I did find my copy of? Zaks Intro to Microprocessors. Somewhere here I know I have a Z80 and maybe some of the support chips. First I have to find the top of my electronics workbench.? William R. Meyers, MSgt, USAF(Ret.) A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein) ? On Saturday, July 25, 2020, 01:55:38 PM CDT, ajparent1/kb1gmx <kb1gmx@...> wrote: Thump thump.. testing 123 test test...
IS there any life or is it dead?
Allison
|
Can we have some details here? I did this stuff back in the late 70's and early 80's, but got into appliance computers when the TRS-80 Model 1, Level 1 came out. Something about releasing the magic smoke from my Cosmac Elf. I'm pretty good with cookbooks, not so much DIY. I can build a mean PC, but that's just assembly. Any mechanic can do it.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Saturday, July 25, 2020, 02:08:21 PM CDT, Richard Cini <rich.cini@...> wrote:
Here’s something for the group. One project I did was to make it wireless/portable. I have a LiOH battery, charger board and Bluetooth LE module (all from Adafruit) mounded in a second Altoids box. The new version of Serial (term
emulator for OSX) can connect to the BLE module. So totally portable and wireless CPM fun.
Get
comatose, but probably not dead. I just retired again, and I've been too busy to play with anything but SWMBO's Honey Do list. ;)
OTH, I did find my copy of? Zaks Intro to Microprocessors. Somewhere here I know I have a Z80 and maybe some of the support chips. First I have to find the top of my electronics workbench.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Saturday, July 25, 2020, 01:55:38 PM CDT, ajparent1/kb1gmx <kb1gmx@...> wrote:
Thump thump.. testing 123 test test...
IS there any life or is it dead?
Allison
|
Here’s something for the group. One project I did was to make it wireless/portable. I have a LiOH battery, charger board and Bluetooth LE module (all from Adafruit) mounded in a second Altoids box. The new version of Serial (term
emulator for OSX) can connect to the BLE module. So totally portable and wireless CPM fun.
Get
toggle quoted message
Show quoted text
comatose, but probably not dead. I just retired again, and I've been too busy to play with anything but SWMBO's Honey Do list. ;)
OTH, I did find my copy of? Zaks Intro to Microprocessors. Somewhere here I know I have a Z80 and maybe some of the support chips. First I have to find the top of my electronics workbench.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Saturday, July 25, 2020, 01:55:38 PM CDT, ajparent1/kb1gmx <kb1gmx@...> wrote:
Thump thump.. testing 123 test test...
IS there any life or is it dead?
Allison
|
comatose, but probably not dead. I just retired again, and I've been too busy to play with anything but SWMBO's Honey Do list. ;)
OTH, I did find my copy of? Zaks Intro to Microprocessors. Somewhere here I know I have a Z80 and maybe some of the support chips. First I have to find the top of my electronics workbench.?
Bill in OKC
William R. Meyers, MSgt, USAF(Ret.)
A human being should be able to change a diaper, plan an invasion,
butcher a hog, conn a ship, design a building, write a sonnet, balance
accounts, build a wall, set a bone, comfort the dying, take orders,
give orders, cooperate, act alone, solve equations, analyze a new
problem, pitch manure, program a computer, cook a tasty meal, fight
efficiently, die gallantly. Specialization is for insects.
LAZARUS LONG (Robert A. Heinlein)
On Saturday, July 25, 2020, 01:55:38 PM CDT, ajparent1/kb1gmx <kb1gmx@...> wrote:
Thump thump.. testing 123 test test...
IS there any life or is it dead?
Allison
|
Lee Hart
Bill in OKC too