From: Mikael Holm (mikael.holm_at_se.danskebank.com)
Date: 2003-01-28 10:40:31
Hej Ruud, Okay, now I see what you mean... And what I want to is to do just as CP/M is doing, use the original 8502-routines to access the command channel. This is not supported by any CP/M service calls, with the exception of the USER function that can execute 8502 code... But as I wrote in another message, I have no idea about how to use this USER-service call. About the Z80-boot ROM, is there a commented disassembly of it available anywhere on the net? Or any disassembly of it, commented or not... //Mikael Hallo Mikael, > But for me it's not an option, because I know even less about > sending pulses over the serial cable to a drive than I know > about CP/M... :-) This knowledge is not needed. What I meant was that the drive cannot know with what it is exchanging data. You also can reason the other way around: a normal C64 and C128 don't notice that 64HDD isn't a real 1541. Unfortunately a speedloader will as 64HDD doesn't execute 6502-ML ie. it is a simulator, not an emulator. But the C128 CP/M uses the original 8502- routines to address drives ie. no reprogramming of the drive. So IMHO CP/M won't see at all that the drive it is talking to a fake drive. Another remark: a good source is the C128's own Z80-bootROM. -- ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org <FONT SIZE=1 FACE="Arial">_______________ Please note that this message may contain confidential information. If you have received this message by mistake, please inform the sender of the mistake by sending a reply, then delete the message from your system without making, distributing or retaining any copies of it. Although we believe that the message and any attachments are free from viruses and other errors that might affect the computer or IT system where it is received and read, the recipient opens the message at his or her own risk. We assume no responsibility for any loss or damage arising from the receipt or use of this message. </FONT> Message was sent through the cbm-hackers mailing list
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