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Re: Welcome to [email protected]

ajparent1/kb1gmx
 

SC131 z180 computer?
?
Screen shots for the system booting and menues along the way.
?
Z180 cpu at 18.432mhz?
512K EEROM??
512K RAM
2 serial lines to 115Kbaud.
uSD interface and device.? (sliced into eight 8mb CP/M accessible disks)
uses less than 250ma@5V
And very tiny!
?
The images are minicom on my Linux Rpi400 using a FTDI TTL serial cable.

IMG_1004.jpg
IMG_1005.jpg
IMG_1006.jpg

Re: Welcome to [email protected]

ajparent1/kb1gmx
 
Edited

For fun I got a new machine to play with...
?
It replaces (I still use it) my YASZBC (Yet Another Z80 Single Board Computer)
with was a Z180 with 256K and 8K of eprom, and 765 FDC.
?
The latest is Z180 at 18.4mz with 512K of ram, 512K of EEPROM,
and a uSD for storage.? Its from Small Computer Central
WWW.SCC.ME.UK.? Its the RomWBW CP/M computer.
?
The difference is the YASZBEC is the same foot print as a 5.25" floppy
(6x 8.5") plus the two FD55 drives.? The new is small (4.375x3x1.25 inches)
and puts in a pocket... sans terminal (or PC running minicom).
Compared to earlier machines at nearly 10mhz (internal Z80 speed)
its fast and the uSD is more than enough storage with eight? 8mb
CP/M or Zsystem disks plus the romdisk.? There is Basic and others
like Forth.? It features two serial ports.
?
?
?
Allison
?
Re: Welcome to [email protected]

ajparent1/kb1gmx
 
Edited

FYI:
?
TRS80 M100 slab is 80C85...? LCD display and typical unit
has 8k to 32K of ram. Mine have been upped to 32K.
Those ran on penlite (AA) cells!
?
I tend up lump 8080, 8085, NSC800 and the whole Z80 family
(z8000 series excluded) as upward software compatible
processors.? That is if you write code for 8080 it should
generally run on all of them.
?
Then again Epson PX-8 was a z80 cmos? with? CP/M in rom
and 8 line by 80 character display.? Fully portable with self
contained battery.? Of the three I have all have wedges
on them that extend ram and give it a ram disk(64/128K).
?
There was a great diversity of systems from the late 80s
though the early 90s.
?
Re: is the group alive?

ajparent1/kb1gmx
 

Shot of my Vt320 screen, KB is out of field.
Z80 amproLB+ with SCSI disk 45mb running CP/M.
Its to the left of the I7 Laptop running Linux.
?
?

IMG_0998.jpg

Re: is the group alive?

ajparent1/kb1gmx
 

On Tue, Aug 27, 2024 at 07:02 PM, Tom C wrote:
I still have some small Z80 SBC systems in my workshop, although they don't get used...
Mine do.? Running CP/M on multiple machines allowed me the opportunity to
amass a lot of software and the WC-CDrom assured I'd have what I needed.?
Generally I use a lot of stuff that source was available as then I could correct
bugs.
?
Best answer given int ehpas as to why I have old systems running is they work.
That and I know the software well and over time I know where, if any, bugs are.
?
Besides the Kaypro 4/84 I have a Kaypro-II and a Osborne-1.
?
The bigger issues from the 80s and 90s for me was assuring the Cp/M systems
could talk to the VAX systems and my PDP-11s.? That covered file transfers and
common editors and at least BASIC language compatibility.
?
?
Re: is the group alive?

 

开云体育

Your ref to the Kaypro triggered a lot of memories from that era.

I had built, in late 70's, a Big Board system at home, added a pair of 8" FDDs (very $$$, even used!), and did a lot of early work and learning with it.? Part of that was developing an application at home, to solve a big problem at work, involving major issues loading large software packages from cassette tape into major industrial control systems, over a 1200 baud serial interface.? Lots of load errors and plant downtime!
The app I wrote stored the apps on the computer, and loaded at a much faster baud rate, and never failed!? We bought a lot of Kaypro 10's after that proof of concept.? I think it was the first approval of a desktop computer in the company (Yes, several of us got spares to use on our desks...).? Very nice creds also, when the industrial systems builder bought the application from us, to use with their other customers.

I still have some small Z80 SBC systems in my workshop, although they don't get used...

Tom


On 8/27/2024 9:46 PM, ajparent1/kb1gmx via groups.io wrote:
I have to admit I have a few favorite machines:
?
AmproLB+ that is the version that can support SCSI and mine does
a fugitsu 45mb partitioned as 5 8mb drive and a 5mb drive the software
BIOS was modded to remap as needed for drives G-K.
?
Kaypro4/84? this has 1MB ramdisk, two 3.5" 760Kb drives, and a?
CF hard disk (64gb partitioned as 8 8mb drives).? Also
Handyman, and advent disk mods.? A utility manages dynamic
assignments of what two of the 8 partitions are drives E and F.
?
NorthStar Horizon (1977 build) with 10MHZ 84C050 (Z80 with
2K internal ram), that has 512K ram, 512K eprom, external floppy
drives (8", 5.25", 3.5")and two internal 30mb hard drives.? Runs a
highly modified version of CP/M 2.2 configured for a 62K TPA
that is mapped into the 512K.? The CCP/DOS and Bios boots from
EPROM rather than system tracks.? System IO is handled by an
8085 (dual serial port controller), 8085 smart DMA floppy
controller,? and 8039 (printer buffer controller).??
?
SB180: A z180 with 256Kram and large Eprom, has the
SCSI board and a 20MB 3.5"disk, dual 720K 3.5" floppies.?
Runs ZCPR.
?
Standalone DEC Vt180 board a Z80/4mhz, 64k, 4 serial
ports and 1793 floppy controller and 8K rom.? Software
in rom is smaller version of NS S100 boots from eprom
to CP/M.? It copies low rom to top of ram for a 60K system.
Once up the roms are disabled.? ?That code fits in
8K eprom with a small 1K monitor.
?
If its not obvious storage is a issue with CP/M more is better
but? it has limits.
?


Virus-free.
Re: is the group alive?

ajparent1/kb1gmx
 

I have to admit I have a few favorite machines:
?
AmproLB+ that is the version that can support SCSI and mine does
a fugitsu 45mb partitioned as 5 8mb drive and a 5mb drive the software
BIOS was modded to remap as needed for drives G-K.
?
Kaypro4/84? this has 1MB ramdisk, two 3.5" 760Kb drives, and a?
CF hard disk (64gb partitioned as 8 8mb drives).? Also
Handyman, and advent disk mods.? A utility manages dynamic
assignments of what two of the 8 partitions are drives E and F.
?
NorthStar Horizon (1977 build) with 10MHZ 84C050 (Z80 with
2K internal ram), that has 512K ram, 512K eprom, external floppy
drives (8", 5.25", 3.5")and two internal 30mb hard drives.? Runs a
highly modified version of CP/M 2.2 configured for a 62K TPA
that is mapped into the 512K.? The CCP/DOS and Bios boots from
EPROM rather than system tracks.? System IO is handled by an
8085 (dual serial port controller), 8085 smart DMA floppy
controller,? and 8039 (printer buffer controller).??
?
SB180: A z180 with 256Kram and large Eprom, has the
SCSI board and a 20MB 3.5"disk, dual 720K 3.5" floppies.?
Runs ZCPR.
?
Standalone DEC Vt180 board a Z80/4mhz, 64k, 4 serial
ports and 1793 floppy controller and 8K rom.? Software
in rom is smaller version of NS S100 boots from eprom
to CP/M.? It copies low rom to top of ram for a 60K system.
Once up the roms are disabled.? ?That code fits in
8K eprom with a small 1K monitor.
?
If its not obvious storage is a issue with CP/M more is better
but? it has limits.
?
Re: is the group alive?

ajparent1/kb1gmx
 

CPM/86 ...
?
It never made it past 386 machine with a meg of ram.? There was concurrent CP/M
but it was unrecognizable as CP/M.? There are sources in C for the brave.
However those sources needed a VAX computer to compile them which
DRI had along with the commercial compiler.
?
Myself I've worked with 8085/Z80/z180 (also others) CP/M and is fine as is.?
The Z280 project is fairly simple electronically but the OS to use its
abilities is the project.
?
?
Allison
Re: is the group alive?

 

Not at my end, as my life seems to want to get and stay a bit complicated. I unloaded all my Z80 systems about 30 years ago. Except a Z80a cpu and some odd & ends of support chips, including a Heathkit H89/Z90 system rom. Bought an SBC131 kit, several years ago, and a soldering station that gave up the ghost the 2nd time I powered it up...

Hands shake enough I may not be able to solder a board anymore.?

I think I'm cursed!?

One of the things I want* is a version of CPM/86 that would run on and use all the memory on a modern gaming PC.?

*I don't expect to get it, and I've never been programmer enough to have a chance at doing it myself. ?

Bill in OKC?

William R. Meyers, MSgt, USAF(Ret.)

Aphorisms to live by:
Good judgement comes from experience. Experience comes from bad judgement.?
SEMPER GUMBY!
Improvise, Adapt, and Overcome.
Physics doesn't care about your schedule.
The only reason I know anything is because I've done it wrong enough times to START to know better.
Expect in one hand, expectorate in the other. See which one gets full first.



On Thursday, August 22, 2024 at 09:58:13 AM CDT, ajparent1/kb1gmx <kb1gmx@...> wrote:


I did and still do a lot of engineering as well as hobby with Z80.
That ranges from 1977 z80 in S100 through a recent project using Z280.
Even ordered a SC131 SB180 to play with as I'm a long time CP/M user.
?
Any life here???
?
Allison
Re: is the group alive?

 

I would say yes, just a little.
Re: This weekend: MakerFaire

 

There was! there also was a huge setup at Free Play Florida in Lakeland.. and again there will be some at This years shows! I plan on bringing out stuff to FPF 2024, I help organize MFO, so can't really have a both setup.
is the group alive?

ajparent1/kb1gmx
 

I did and still do a lot of engineering as well as hobby with Z80.
That ranges from 1977 z80 in S100 through a recent project using Z280.
Even ordered a SC131 SB180 to play with as I'm a long time CP/M user.
?
Any life here???
?
Allison
Re: Welcome to [email protected]

ajparent1/kb1gmx
 

Partial list of what I have in systems..? I left out the
PDP-8/PDP11/MicroVAX section.
?
CPM speaking machines:
======================
S100 subgroup
-------------
Altair8800(pre-A) Built jan 1975 SN200!
Altair 8800B-T complete, factory 1978
2 Northstar Horizon, CP/M, NS*dos, hard disk (one I built in '77)
CCS-2200 (z80-full boat) CP/M2.2?
Compupro full boat with 8085/8088 or Z80 card and MPX-1 (CCPM)
Netronics Explorer 8085 ?w/VDM1

SBC/bounded systems:
--------------------
AmproLB+ CMOS modded and running with 45mb 3.5" SCSI
SB180 with SCSI adaptor, adptec scsi bridge and 20mb CPM2.2
3 Visual technolgies 1050, CPM-3 two with outboard 10mb SCSI disk
Kaypro 4/84 w/handyman and Advent turborom+personality card
Kaypro II complete
2 Vt180 complete
2 Vt180 CP/M board built up as standalone one modded for 6mhz
1 Vt185 Thats a Vt125 + Vt180.
Osborne 1
Several Epson PX-8 with 120k ram wedge and 300bd modem wedge
?
Other buses (not s100):
-----------------------
NS* Advantage (hard disk)
2 Hurkon Z80 Multibus system CP/M2.2
?
Re: Z80 CMOS version doesn't like single stepping

ajparent1/kb1gmx
 

Take care with reset as it has to be held for a minimum time.
Also when stopping clock I think it has to be stopped with clock high.
?
also are you saying single step as in slingle clock cycle or asserting
/wait after each /M1?
?
?
?
Allison
?
Re: This weekend: MakerFaire

 

I live in Tampa Bay, and here is a small list of what i own ( listed on my Twitch Channel that I Stream retro Repairs from )?

Commodore Pet
Commodore VIC-20
Commodore C64
Commodore C128
Amiga 500
Amiga 1000
Amiga 3000
IBM PC 5150
IBM PC 5151
Tandy 1000 SX
Tandy 1000 TX
Tandy 1000 HL
TRS 80 Model 4P
TRS CoCo
TRS MD-10
Atari 400
Atari 800
Atari 800XL
Atari 1200XL
Atari 520ST
Atari 1040STF
Aquarius
Coleco Adam
Intellivision
SGI Indigeo 10000
Timex 1000
Apple IIe
Apple IIgs
Apple III
Franklin Ace 1200
Macintosh LC
Macintosh Performa 5XX
Macintosh IIfx
Macintosh PowerBook ( m68K )
Osbourne Luggable OCC1
Osbourne Luggable OCC2
Amstrad PC640 ( Dead )
KayPro II
KayPro 10
IMSAI 8080
Zenith Data Systems ZWG-121-32

William Stillwell




On Sun, Nov 5, 2023 at 10:11?AM David (Admin) <billsbrough@...> wrote:

William,

Thanks for the update. I didn't think that were active groups in Central Florida though Tampa is a little far away for me.

I still have an Health H8 and a Radio Shack Model 4. Neither has been powered on in a long time.

regards,

David
Re: This weekend: MakerFaire

 

William,

Thanks for the update. I didn't think that were active groups in Central Florida though Tampa is a little far away for me.

I still have an Health H8 and a Radio Shack Model 4. Neither has been powered on in a long time.

regards,

David
Re: This weekend: MakerFaire

 

David, there is a small setup of retro computers this year at the faire, most are members of the central Florida and Florida Retro Computer Clubs

There is also another event coming up in 2 weeks at Free Play Florida ,and then on 12/9 there is a free retro computer event at Tampa Hackerspace.
This weekend: MakerFaire

 

I hope to get to this event tomorrow:

 https://www.makerfaireorlando.com/

Can not tell if there a a retro-computer groups this year.

Any one still playing with this stuff?

regards,

David
Re: Z80 CMOS version doesn't like single stepping

 

Well I may have spoken too soon.? I was testing with the clock frequency low-ish.? I turned it up? to 500kHz and now it works after a reset.? Next I need to create a power on reset circuit.
Re: Z80 CMOS version doesn't like single stepping

 

Good news, the IOREQ line on my Z80 is functional.? I had two data bus lines that were swapped resulting in the instruction not arriving at the CPU as the OUT instruction.? Now the only issue I'm facing I believe is timing related.? When I first plug the circuit into power, the PIO doesn't appear to be to initialize properly.? The only way I can get it to activate is to bounce the IOREQ line a little until it outputs on port A.? After that I can reset the CPU and the code executes fine.? Any suggestions?
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