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  • deramp5113's Avatar
    November 25th, 2020, 01:38 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    From what I recall, the programmer address is the address of the socket you’re going to use to program. For example, if you enabled programming for...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 24th, 2020, 09:23 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    In CP/M, ctrl-s should pause and resume the output. There’s also an option in the program for a 16x64 character screen. Type “SS 0” and I think it...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 22nd, 2020, 05:32 AM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    So I assume the Matrox board must use PRDY because it has to stall reads/writes around video refresh access? In this case, the problem you’ve run...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 08:47 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    Yes, the Sol-20 PRDY circuit actively drives PRDY high and low, that's why I was wanting to know whether the Matrox board was trying to sink a...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 07:51 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    Were you seeing the Sol-20 erroneously drive the PRDY line high (asserted) or low (wait request)? Mike
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 06:08 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    It looks like the Sol-20 itself only drives PRDY for its own memory access (C000-CFFF) and for its own IN/OUT ports. Mike
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 06:06 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    Look at the help menu. You’ll have to set the ByteSaver type with the BS command, the memory bank (0) with the BB command, and the address of the...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 05:48 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    In general, boards driving PRDY or XRDY should do so with an open collector buffer or tri-state buffer that is enabled only when the board is...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 21st, 2020, 05:36 PM
    deramp5113 replied to a thread Bytesaver ii questions. in S-100
    Hugo, Martin Eberhard wrote a full featured CP/M program that supports all three ByteSaver programmers. I’ve used it a lot with my ByteSaver II. ...
    27 replies | 399 view(s)
  • deramp5113's Avatar
    November 20th, 2020, 07:26 AM
    That UART is made by several manufacturers under different part numbers. Compatible UARTS include AY-5-1012, AY-5-1013A, TMS6011, AMI S1883, COM2502,...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 20th, 2020, 07:23 AM
    Unlike PC2FLOP and FLOP2PC which I designed to run without needing an operating system, PCGET and PCPUT are CP/M programs. They will not execute...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 19th, 2020, 09:11 AM
    The content of the disk doesn't make any difference to the transfer, however, it could affect a failing UART. The UARTs used in the Sol-20 were...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 18th, 2020, 04:08 PM
    Have you had logging enabled the whole time or only after you encountered problems? If the whole time, don’t use logging during the transfer. Are...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 18th, 2020, 01:26 PM
    Did you turn off XON/XOFF? This can cause problems in XMODEM which does its own packet by packet handshake with ACK/NAK. Mike
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 18th, 2020, 08:34 AM
    "CPM22-48K-35T.DSK" is for the Micropolis disk controller running in the Sol-20, not the single density North Star controller. You MUST use the disk...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 18th, 2020, 07:55 AM
    What disk controller are you using in the Sol? Maybe you could run the Spectrum card in high RAM address like D000-EFFF depending on your disk...
    6 replies | 112 view(s)
  • deramp5113's Avatar
    November 16th, 2020, 06:02 PM
    Well that is odd... Thanks for catching that. I just uploaded FLOP2PC.COM. Mike
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 15th, 2020, 07:56 PM
    The .COM file is a binary file, so whatever escape character you're looking for in the code you added to LOADER.ASM is most likely going to be in the...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 14th, 2020, 01:34 PM
    You can reset the Sol-20 from the keyboard by holding down the REPEAT key and then pressing the UPPER CASE key. The easiest (and most common) way...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 13th, 2020, 08:44 PM
    See the “ReadMe” file in the same directory as PC2FLOP and FLOP2PC for more information. The programs run on your Sol-20. PC2FLOP writes a floppy...
    75 replies | 2317 view(s)
  • deramp5113's Avatar
    November 13th, 2020, 01:24 PM
    Here is the PC2FLOP utility for writing a disk from an image transferred from a PC. A few Sol-20 disk images are here too including CP/M and North...
    75 replies | 2317 view(s)
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