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Hi Scott, XModem by Martin Eberhard uses a config file.?The DISK-A image at Lee's website has recently (Nov 2019) been updated with the correct config file to use SIO address. SURVEY, I don't know

scotty264b@... wrote: Hi Scotty, The CP/M DDT.COM debugger can single-step without using interrupts; thus, no front panel or timer is needed. But it requires that the program you are tracing is

scotty264b@... wrote: Hi Scotty, Thanks for alerting us. Glad you found it. The XMODEM on the DISK-A image was the *unconfigured* one. Josh added the configured one, and I put it in the DISK-A

Okay, I found a version of XMODEM that assembles and works properly. It seems that the one provided with the SDcard images is V2.2 (7 Oct 2014 @ 8KB), while the one I found is V2.4 (4 August 2016 @

Hello All: I have Z80MC + SIO card. No FP. If I wish to implement the single-step feature of the ZMC monitor, is it as easy as providing a 1KHz interrupt (derived and thus sync'd with Z80 clock) and

Hello All: I have the Z80MC w/ SIO (no FP). I know there are some Z80MC specific programs supplied within the DISK-A.BIN image but I see no source code for them. I see no files populating the

I guess binary would have to be 1's and 2's then! LoL... I have no idea how the hell that would work, but it's funny to try thinking about it.

Roman numerals require a larger jump as there is no numeral for 0-zero. That had to wait for the Arabic mathmatitions to invent. Think of computing without the concept of zero. Allison

joshbensadon via Groups.Io wrote: We switched from decimal to binary when we started inventing computers. That was necessitated by the hardware. So if the Romans invented computers, I suspect they

Wow, ok, that's a bug I didn't know about..? I'll post that to my v16 to-do list. Josh.

All good information, and definitely some things to play with, but the problem isn't failure to preserve the registers but unable to modify the registers via the "r" command after returning via

Hi Rich, Yeah, I think it was even less than 2 years.? I believe I saw ads for IMSAI as early as Feb 1976 (13 months after ALTAIR's announcement Jan 1975). On the topic of Octal vs HEX.? I might

Bob Kircher wrote in, "If I were to write a program to run on the Z80MC in high memory (not? under CPM) what is the preferred way to return to the monitor?? I had? been using JP 0042H ( JP

Just compare the Altair to the IMSAI front panels. They are separated by 2-3 years and the grouping changed from an octal grouping to a hex grouping. I’ve seen a few Altairs in which the user put

I should note... the original idea of using colours for HEX / Octal wasn't mine, I got it from the IMSAI 8080, the switches could be re-arranged for HEX or Octal.? I'm not sure if that was an

Paul Bigwood wrote: It's one of those "someday..." things. My Heathkit H8 and H89 computers both support both octal and hex displays. The H8 uses two different ROMs (2K each). The H89 has a bigger ROM

Hi Lee and Josh, Different colored LEDS would do the same. Grest idea. It would be good if the ROM monitor could .support both Hex and Octal, but understand the issues. Yes, that was the site for

Paul Bigwood wrote: Do you mean George Morrow's "Keyed-Up" combination front panel and 8080 CPU board? This one? <http://ferretronix.com/march/sbc/morrow_s100/> joshbensadon via Groups.Io

Hi Paul, There is barely enough space for the LED's they're packed in there like commuters on the 5 O'clock train! But, you can very easily alternate colours of LED's.? I'm using Red and Yellow, in

Lee,?I was very interested in the G Barrow 8080 S100 board octal display and keypad. A Google search turned up the user manual with cct and rom code.I first learnt octal coding when i worked at DEC