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  • JonB's Avatar
    Today, 09:23 AM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    Another update. I've merged the two BIOSes and removed all the hard coded addresses. Then changed the OFFSET value (this is the address all others...
    14 replies | 1406 view(s)
  • JonB's Avatar
    Yesterday, 05:53 AM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    Thanks - the uIDE warm boot is working now. Next up: Merge BIOS and hidden BIOS. The cs30bios.asm file is in 8080 so I need to convert to Z80 first....
    14 replies | 1406 view(s)
  • JonB's Avatar
    February 19th, 2019, 10:38 AM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    OK, fixed. Boot from uIDE, warm boot from floppy. Now to update the BIOS with drivers..
    14 replies | 1406 view(s)
  • JonB's Avatar
    February 19th, 2019, 09:43 AM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    After a bit of a slog I have the Superbrain booting from the uIde card. It still access a: though, because it's logging the disk in, and it crashes...
    14 replies | 1406 view(s)
  • JonB's Avatar
    February 18th, 2019, 02:16 PM
    OK, so first off I doubt it is only reading 3 bytes of the second sector. Surely it has to read the whole sector? Anyway.. it could load the second...
    4 replies | 95 view(s)
  • JonB's Avatar
    February 18th, 2019, 12:15 AM
    JonB replied to a thread Its Back!!! IMS 8000 in S-100
    Nice one, Alan! What about the Superbrain? :D As you can see I have just joined the S100 club. This'll be fun!
    10 replies | 249 view(s)
  • JonB's Avatar
    February 18th, 2019, 12:14 AM
    JonB replied to a thread Mystery S-100 card in S-100
    If only the paint hadn't been rubbed off that VLSI IC. I may find some clues in the collection of disks that came with the machine, but I have...
    11 replies | 221 view(s)
  • JonB's Avatar
    February 17th, 2019, 01:20 PM
    JonB replied to a thread Mystery S-100 card in S-100
    ..but it seems a bit sparse for an MFM controller. What might that VLSI chip be?
    11 replies | 221 view(s)
  • JonB's Avatar
    February 17th, 2019, 12:55 PM
    JonB replied to a thread Mystery S-100 card in S-100
    Ooh, exciting! I didn't dare hope...
    11 replies | 221 view(s)
  • JonB's Avatar
    February 17th, 2019, 09:06 AM
    JonB started a thread Mystery S-100 card in S-100
    Hi Just got an S-100 system. It has a Teletek FD-1 processor board and various other known cards, but there is one card I can't find any info on....
    11 replies | 221 view(s)
  • JonB's Avatar
    February 17th, 2019, 06:44 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    Keep the faith Alan, and keep plugging on. You will get there in the end, I am sure. I'm at the stage where I have a uIDE boot but the screen is...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 17th, 2019, 06:39 AM
    Hi I have source code for ACT and CMS hard drives on the Superbrain, although it looks like I already posted it on the other thread. FYI, the...
    4 replies | 95 view(s)
  • JonB's Avatar
    February 13th, 2019, 01:20 PM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    Formatting the drive was so 2017, Alan (check the date on that post).. I will make them available when the new CP/M is ready, not before... have...
    14 replies | 1406 view(s)
  • JonB's Avatar
    February 13th, 2019, 11:05 AM
    JonB replied to a thread uIDE on the Superbrain in CP/M and MP/M
    Fellow Superbrainers After a bit of a long delay, I have some progress to report. I've reverse engineered the ROM 1st stage boot loader code and a...
    14 replies | 1406 view(s)
  • JonB's Avatar
    February 10th, 2019, 04:15 AM
    And so, after much mucking around.. https://www.youtube.com/playlist?list=PL2L62b7tPEXut4B3zgTygFQxfKM3o-x99 The driver installs below the CCP...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 10th, 2019, 03:57 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    Ah, you let out the magic smoke! :D Occupational hazard, I'm afraid. Definitely replace the PPI socket. It is clear there's a bad connection...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 9th, 2019, 08:45 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    That is the video (luminance) output from the CRT8002. Put a 'scope on it. I'll check mine, but I don't think it should be high. (Edit: Yes, should...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 9th, 2019, 05:15 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    Beat me to it. Also try probing around Z55, the shift register that feeds the character generator. We should have activity on its input and...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 9th, 2019, 05:10 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    Oops.. Obviously you will have swapped Z56 back to the "sane" one. Have you attempted without the boot disk? We're looking for the "Insert...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 8th, 2019, 01:08 AM
    Interesting.. What I am trying to do is install a driver for an IDE interface, which JohnElliot might be familiar with as he advised me on writing...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 7th, 2019, 09:27 AM
    Oh, sorry, you already knew it's CP/M 2.2! I think I may have made a blunder. When I examined the Superbrain's CP/M implementation, it seemed to...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 7th, 2019, 08:32 AM
    No, it's CP/M 2.2 - no RSXes. Looking at it, I can run the loader under ZSID, and all the load addresses get moved down. This means that ZSID is...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 7th, 2019, 05:53 AM
    This is why I couldn't patch Amstrad CP/M Plus for the uIDE device... (and the reason I asked the question). Thanks for the insights! Another...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 6th, 2019, 04:39 AM
    OK, thanks. so this demo will work until the next warm boot, then it will have to be reloaded. It'll only need to do some DIR, TYPE and PIP...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 6th, 2019, 01:40 AM
    Hi A question about conventions here. I want to determine the size of my TPA. That is easy enough (it runs from 100h to the address in 0006h), but...
    17 replies | 512 view(s)
  • JonB's Avatar
    February 5th, 2019, 07:19 AM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    OK, so it isn't booting fully to CP/M. Darn it. Might be worth putting your 'scope on the HSYNC. VSYNC and Video. Or the logic probe (you can see...
    81 replies | 2352 view(s)
  • JonB's Avatar
    February 4th, 2019, 01:44 PM
    JonB replied to a thread Superbrain QD repair in CP/M and MP/M
    No, check the 15v supply line first. Test the connections to the video board using a multimeter (continuity). It needs GND, power, HSYNC, VSYNC and...
    81 replies | 2352 view(s)
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