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Soon, I shall be making the leap from 2.2 to 3.0, and as I go through the various docs I have downloaded, I'm trying to find a simple, native Z-80, assembler, that I can run in a CP/M 3 environment. I see the MAC and RMAC, but I'm just looking for something that I can write some Z-80 (not 8080)...

I'm sure there are many of you that have put together a system using the S100computers.com boards, and I am now in those ranks as well. My current Z-80 STD bus system is running CP/M 2.2, but my new S-100 Z-80 system is going to run CP/M 3.0. I'm just wondering if anyone has a list of some of...

I'm putting together an S-100 CP/M machine that consists of a CPU board, a memory board, a dual CF disk storage board, and a keyboard, mouse, and display board. There is no disk controller card,and the CPU Monitor program is setup to use a serial interface that I do not have. I got to thinking...

Since my S-100 will only have boards, besides the CPU Board (https://forum.vcfed.org/index.php?threads/homebrew-s100-cpu-board.1245502/), I noticed something that may be an issue. The I/O Board uses a couple 74LS138s for port decoding, and the port decode for the two 8251A serial chips go...

Well, after many months of digging through documents, schematics, and websites, I have finally gotten my CPU card designed, and built. Part of it is based on the STD bus Z-80 board I use in my development system and the rest is based on designs from Ithaca, Vector Graphics, Wameco, Cromemco, and...

My development system is an STD/Z80/CPM system with 64K and uses a serial port for the console. As for storage, it has a CF to IDE adapter and uses address x8h to xFh. And since it does not decode the upper four bits of the port address, anything from 0xh to Fxh gets swallowed up. However, the...

The other day I got to thinking; modern computers have a network boot capability but I imagine that you could get a 1Gig ethernet interface working on a retro CP/M machine. But, what if you replaced the ethernet interface with a serial interface..... You have a boot ROM, that relocated code to...

I have this card for my 8560, and I put 4 MB of memory on it. Problem is, the ref disk recognizes the card, but POST does not seem to do any testing of the memory. In doing some more online searching, I found a link to something that discusses the "2-8MB Memory Expansion Option Diskette advanced...

Well, my IBM PS/2 8560 'restoration' project is coming along. Not so much restoring it, but 'tricking it out'. Anyway, I got hold of an 8514/A with memory expansion, and it works great, except that the display I hooked up to test with does not support the 1024x768 43Hz Interlaced video the...

I'm taking a break from finishing my suite of RAMdisk applications since I purchased an old IBM PS/2 8560. It now has a dual RS-232 card and I'm hooking each port to a serial port on each of my CP/M machines (one with STB bus and the other is S-100). The PS/2 will be my 'file server' (PS/2 Com...

Okay, so I know that is a bit 'weird', but my IBM PS/2 8560 BIOS support 360K & 1.2M 5-1/4" floppies and 720K and 1.44M 3.5" floppies. I have the external 5-1/4" drive adapter card, cable, and the part that plugs into the 3.5: Drive B: position. Since there are 34 pin to 50 pin 8" drive...

Having recently acquired this baby there are a few parts & pieces I like to look for as either replacements for something missing, or of questionable performance, or as a future spare: 1. 1.44MB (1/2 Ht.) Diskette Drive 72X8523 or 90X6766. These seem to be Mitsubishi MF355W-99M2, Alps Electric...

I'm really not 100% sure where to even post this, but this looks to be as good as any. In my digging through the BASICA, QuickBASIC, GW-BASIC, etc. books, I never seem to be able to find any reference to a Com port other than 1 or 2; as in, OPEN "COM3:9600,N,8,1,RS,CS,DS,CD" AS #3. I know you...

I remember using the $25 Network to hookup my two IBM XTs to my IBM AT, where the AT acted as the file server. This simple network was just RS-232 at 115K baud, but it worked great. I stall have a copy of that program. I do stuill wish I had my old copy of Software Carousel though. It was great...

Anyone familiar with a version of CP/M that can be installed on an IBM PS/2 Mod 60? Something that can utilize either MFM or ESDI drives? And how about programs to run on it as well? Just curious. Otherwise, the alternatives are either some Unix-link flavor, or the old standby DOS. Hey, just a...

Well, I'm at the point of putting design to keyboard and writing code. I'm going nice and slow to check things out in stages. I'm putting 'testing stubs' in the code so as not to screw things up too much. Format the RAMdisk (MDFRMT), put in the dummy directory entries, make sure they are there...

I was going through my list of S-100 board manuals & schematics, looking for a generic 80 charater by 24, or 25, line board. Something simple and generic that used a common Character Generator ROM that has descenders. But came up empty handed. Anyone have any thoughts or suggestions? I'm not...

I've often wondered why using the DTMF format for data recording was never used in the early days to record data to cassette for example. I've read many times about the inherent issues with properly detecting the single tones from KCS tapes, etc. As DTMF was introduced in the early 60's, it was...

I had a thought about this last night. How can I add more disk drives, without fiddling with the CP/M system files or designing more hardware. My thinking was to be able to have two identical disk drive interfaces, and just toggle their ports back and forth; somewhat like what is done with...

As I start to put together the framework of how I want this to work, there are 96 possible directory entries, each taking up 32 bytes. The first byte of each directory entry is a 0 if the entry is empty, or a 1 if the directory has an entry. So, in order to list all the files in the directory, I...