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Forum Index : Microcontroller and PC projects : CMM2: Z80 Simulator Running CP/M 2.2
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| GerryL Newbie  Joined: 24/01/2019 Location: AustraliaPosts: 31 |
Attached is a zip file of a Z80 Simulator for the CMM2 I have been playing around with that others of my vintage may find interesting. This will also run CP/M 2.2 which was originally placed in the public domain in 2001 (reconfirmed and clarified in July 2022) http://www.cpm.z80.de/license.html Note this is a simulator and not an emulator so I have not covered off on some of the hardware and it will ONLY run the Zilog ‘documented’ instructions. Can be run with or without a mouse. The CP/M side is using the original Digital Research assembly files dated Jan and Feb of 1980. To assemble the CP/M files and build some testers I wrote a Windows Console macro assembler that I have included. The macro assembler is based on Digital Research’s 1980 CP/M Macro Assembler Manual. This will assemble both 8080/85 and Z80 instruction mnemonics. This simulator was written as a fun project so I’ll guarantee there will be glitches and the assembler may not understand every way you can write an assembly instruction (the Z80 has about 694 legitimate combinations of opcodes and operands so there is bound to be a screw up somewhere). Also, it is not lightning fast, it runs about an average of 2.5 times faster than a standard 4MHz Z80, or a bit over 1 microsecond per instruction (of course the times depend on the instruction type). For anyone wanting to have a play around the zip file contains a number of guidance instructions and examples. The analog clock example is a good demo of using an in-line repeat macro in the assembly code to do all the heavy lifting during assembly in generating the pixel location tables for the minute tick marks, second hand line, and minute and hour hand triangles. Note I have not checked if inputting or setting CMM2 pins actually works as the intent of the project was focused on the software side. I have a lot of fond memories of the Z80 and CP/M 2.2, my first encounter was back in the early 1980’s when work purchased some Prolog boxes with a STD Bus cage, power supply and two 8 inch hard drives. We used a Z80 ‘Little Big Board’ (manufactured by Pulsar in Melbourne) running CP/M 2.2. This was used extensively to log strain gauges using a compiled Microsoft Basic program. We also used a CMOS Z80 board manufactured by JED Microprocessors in Melbourne for field work, logging a range of sensors and GPS. Below is the image of the main display panel and below that is a snap-shot of a Tera Term screen of using the TBS Benchmark Basic tests in CP/M. The first set of times is running directly in Microsoft MBASIC while the second set of times is from a compiled and linked version.   CMM2 Z80.zip Gerry |
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| Volhout Guru  Joined: 05/03/2018 Location: NetherlandsPosts: 3488 |
That is amazing. I myself was in the 6502 camp, but looking at this I can only congratulate you on such an achievement. That is stunning. Great work! All the more since it actually runs real code (cpm). Edited 2022-09-20 15:38 by Volhout PicomiteVGA PETSCII ROBOTS |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
Truly beautiful! An excellent piece of work. :) I'm going to have to have a play with this, that's a lovely simulator panel. I first played with the Z80 about 43-odd years ago, on the Nascom-1 and I still have a soft spot for it. I also built a Vero-wrapped version of the MBC1 SBC with a couple of flash chips on it to act as disc drives (running CP/M, of course). I'm just considering getting a proper PCB and re-building it into a MBC2. Another ongoing project is a Nascom-4, which is actually a Nascom-2 plus add-ons but all running on a FPGA. It might even get a Gotek drive yet. I saw a Z80 simulator running CP/M 2.2 or CP/M 3 on a ESP-32 with a SD card pretending to be a pile of disks the other day. I might try that too. :) Edited 2022-09-20 17:42 by Mixtel90 Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 8566 |
Brilliant bit of coding - many congratulations. |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3649 |
Goodness me!! Amazing. (I used to write drivers for CP/M, MP/M, CP/M-86, MP/M-86, MS-DOS as well as UNIX etc.) John |
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thwill Guru Joined: 16/09/2019 Location: United KingdomPosts: 3828 |
Most impressive. I didn't know you could call back from CSUBs into MMBasic - very interesting. Good work, Tom Game*Mite, CMM2 Welcome Tape, Creaky old text adventures |
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| William Leue Guru Joined: 03/07/2020 Location: United StatesPosts: 381 |
My goodness! That is a brilliant piece of work! -Bill |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3008 |
Ditto. Terrific job. I started building a Z80 CP/M machine from boards in 1977, and got it working in 1979 (power supply was the big holdup). Did a lot of Z80 assembler coding. But I'm spoiled now by MMBasic, and don't want to go back. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
Me too. :) Happy memories of using Zeap on the old Nascom-1 though. Seeing the OP's pictures suddenly brought back a lot of memories of register pairs and the alternate register set. I'm going to have to get the Nascom-4 completed now. It has real chips for PIO, CTC and FDC. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 328 |
OHH ME OHH MY, this is a pleasant morning, a step to unlocking Walnut Creek CP/M GOODNESS I turned the volume on the monitor to max and could hear sound. Thanks Stanleyella |
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| twofingers Guru Joined: 02/06/2014 Location: GermanyPosts: 1133 |
@Gerry Sweet memories! Thanks!  Michael |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 1985 |
this is really amazing work, well done! almost tempted to get a CMM2 just for this. Hate to be Billy Boring... no R register? also Is the HALT="back to basic" functionality programmable? I would love to run some of my old stuff on here and we used the HALT signal as a single bit of I/O (well, O) as part of the memory swap hardware design. While I know the hardware would not be emulated it would still need to continue after the HALT (and subsequent INT to trigger the hardware re-configure). Small point, probably tweakable by yours truly. Edited 2022-09-21 01:45 by CaptainBoing |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
Are you using dynamic flash, Cap'n? ;) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 1985 |
LOL, I bought some off ebay... wasn't up to much. The R register was often used to seed RNGs... just for compatibility's sake. As an aside, how short sighted of Zilog to make it only 7-bits.... why Zilog, Why? (and don't get me started on the 4-bit ALU!!!) I can only assume fab prices were hideous back in the 70s |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 5705 |
They didn't need 8 bits for a DRAM refresh register at the time so they didn't provide them. :) Some later derivations of the Z80 did have 8-bit refresh. The 4-bit ALU was very clever. The aim was to equal or better the 8080 in performance and by using 4-bits with pipelining they did it. There was also a separate 16-bit "ALU" that could just increment and decrement, but it was direct on the internal bus so very fast. That was used for all sorts of purposes. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| GerryL Newbie Joined: 24/01/2019 Location: AustraliaPosts: 31 |
thanks guys, appreciate the kind words. Gerry |
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Quazee137 Guru Joined: 07/08/2016 Location: United StatesPosts: 521 |
Wonderful ! ! I LOVE my Z80 and CP/M and ZCP/M years. Big THANKS, now I need to look through some boxes for my BIG Board and 8" drives. Quazee137 |
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| LechU Newbie Joined: 18/01/2022 Location: PolandPosts: 3 |
Is it possible to migrate this to MMBasic Windows/DOS? |
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| Rickard5 Guru Joined: 31/03/2022 Location: United StatesPosts: 328 |
OHH WOW you must be in Dallas to have a Big Board :), Jim Tanner has a Whole Stack of Blank unbuilt Big Boards :) I had a Big board back in the late 80's I turned the volume on the monitor to max and could hear sound. Thanks Stanleyella |
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| TrevorC Newbie Joined: 15/07/2020 Location: United KingdomPosts: 14 |
Hi. I am having problems with running Z80CPM22.bas. The OPTION to create the controls needs to be OPTION MAXCTRLS 120 Then when I select LOAD CP/M I get an error Error in line 527 : IF without THEN Can you help me with this error. Thanks Trevor |
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