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  1. Replies
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    Since port 1ch is the Z80-PIO, it makes sense...

    Since port 1ch is the Z80-PIO, it makes sense that there would be more access to it. Also, the code could fairly-reliably "test" whether the Z80-PIO is present, and thus detect which kind of Kaypro...
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    My guess would be that the ROM is trying to...

    My guess would be that the ROM is trying to function on both old (Z80-PIO at 1ch) and new (latch at 14h) mainboards.
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    I've never heard of "stock" Kaypros with 80-track...

    I've never heard of "stock" Kaypros with 80-track drives. The Kaypro technical manual doesn't describe that. I don't recall any code in their ROM BIOS that supports that. Perhaps that was part of the...
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    A lot of people are build (selling kits) modern...

    A lot of people are build (selling kits) modern machine that runs CP/M. Lots of those to choose from, one I know of is the https://rc2014.co.uk/
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    As I recall reading, the QD drives (if by that...

    As I recall reading, the QD drives (if by that you mean the very high density 192 tpi drives) were not only problematic but also required special pre-formatted diskettes. I think they could still...
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    As Chuck pointed out, the multi-sector count is a...

    As Chuck pointed out, the multi-sector count is a major improvement in this area. Can't say whether your CP/M 3 BIOS also lets the BDOS do sector blocking, but if it does then you get an additional...
  7. Examining the only phone I have that still uses a...

    Examining the only phone I have that still uses a corded handset, I see that cable is reversed - contrary to my memory (seg-fault, core dump). Anyway, cable wire gauge is important (conductance) so...
  8. Larry, your post has got me concerned. Telephone...

    Larry, your post has got me concerned. Telephone handset cables are straight-through, but your instructions show a reversed cable. Unless the Kaypro II used a different pinout at the Keyboard from...
  9. This topic always seems to generate lots of...

    This topic always seems to generate lots of argument. My own experience was that telephone handset cords are not sufficient. The wire used in them was too small to provide reliable operation. You...
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    Thanks, Rob. I can view these latest attachments....

    Thanks, Rob. I can view these latest attachments. It is great to see those old (new) boards up close! And the block diagrams, and details like this latest post on address handling, will help keep me...
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    Excellent progress. Still trying to view the...

    Excellent progress. Still trying to view the attachment, but something is wrong. Sent a note to the administrators. Is that same diagram available on your HoneyPi web site?
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    Are you sure the drives are single-sided? I...

    Are you sure the drives are single-sided? I thought all 2X (and beyond) shipped with double-sided drives. Of course, as previously commented, Kaypro is notoriously inconsistent. But, I thought the...
  13. Yes, it does seem that CPM3.SYS was destroyed by...

    Yes, it does seem that CPM3.SYS was destroyed by your running GENCPM. I assume that is on the harddisk? If you have a bootable floppy, you may be able to restore it. Typically, that vintage of...
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    Based on the back panel, you have the newer...

    Based on the back panel, you have the newer mainboard. So, probably a 2X (2/84) model. Still, the thing that really determines the version of CP/M is the ROM. So look at the labeling on the chip at...
  15. I'm guessing your performance is governed by I/O....

    I'm guessing your performance is governed by I/O. The floppy, and to a lesser degree the CRT, operate at fixed frequencies. You might see scaling beyond 4MHz for things that were compute-intensive,...
  16. Think thing that the "squeezing" makes me think...

    Think thing that the "squeezing" makes me think of is drooping voltage, or possibly interference, related to a high current spike when the motor tries to start (perhaps because of the spindle not...
  17. Previously I got the impression you were seeing a...

    Previously I got the impression you were seeing a "squeezing" of the screen? This jitter sounds like something different. Sounds like something is affecting the dot-clock, but for it to only affect...
  18. One more thing, as the "wow" you described could...

    One more thing, as the "wow" you described could be due to the diskette media spinning slightly off-center, be extra careful when inserting diskettes when the motor is not running. Be very gentle...
  19. So, if the signal is better when written on the...

    So, if the signal is better when written on the drive, that suggests head alignment. It may also be possible for the heads to get knocked off "square" - which might also make "foreign" diskettes...
  20. Can you tell what the "wavering signal" is...

    Can you tell what the "wavering signal" is synchronized to? For example, if you trigger the scope on the index pulse, does the wavering vary or lock-on? I'm not familiar with the drive electronics,...
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    I'm not experienced making that sort of...

    I'm not experienced making that sort of modification, but looking at the schematics I think it is more complicated than it sounds. You've got the Z80 peripheral chips that also need to be upgraded,...
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    Jan, there is nothing wrong with doing your...

    Jan, there is nothing wrong with doing your sysgen on a modern PC. If fact, that is the model Digital Research used - they produced their distribution image on a minicomputer. If you are eventually...
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    that behavior depends on the ROM version you...

    that behavior depends on the ROM version you have. Some timeout and print a message like "no system disk" (RESET required to retry), others just continually try to access media - in which case as...
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    I use 'zmac' for cross-assembly....

    I use 'zmac' for cross-assembly. http://48k.ca/zmac.html. It has a CP/M compatibility option "--dri" that should allow you to assemble DRI source code. My favorite options for assembling CP/M source...
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    More importantly, when I try to compile the...

    More importantly, when I try to compile the CCP+BDOS_BIOS code, I get all sorts of "multiple definition" errors. At the very least, the symbol "status" is defined three places, once as a memory...
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