From: Baltissen, GJPAA (Ruud) (ruud.baltissen_at_abp.nl)
Date: 2006-05-29 09:22:45
Hallo allemaal, > I have my 1541LPT project working :) I tested it with the programs 'check disk' and 'performance test', found on the original 1541 test disk and all worked fine. Some additional technical information: - The PC runs a little Pascal program. At start-up it loads an hardcoded D64 image. But I altered the Initialize command in a way that it accepts an extra parameter. This parameter tells the PC what D64 image to 'load'. - The speed: - The original Kernal has to wait for the wanted sector to pass the head. In case of 1541LPT the wanted sector is presented the moment it is asked for. - I shortcircuited the stepping routine and it is definitively is faster then the original. But the routine checking if the motor is running or not is still in place so things could be improved here yet. - Formatting a track is now sending two bytes to the PC and that's it. Future: - Maybe using G64 image. At this moment I use the ID found in the BAM as ID found in the sector header as well. Programs using different ID's in different sectorheaders as copyprotection will detect an error and stop. Using G64 can avoid this. - Making a version for JiffyDOS, SpeedDOS and other speedloaders. FYI, the only part of JiffyDOS that my program affects is the format routine. - Using 'bigger disks'. This could be done by shifting all needed 'calculations' to the PC; in this way the 1541 only acts as a pass-through station. This could have an impact on the compatibility of course, but imagine the gain. - Now I'm using an extra 6522 as interface. Imagine using an USB interface instead.... My future plans: - First thing to do: creating a page on my site with all info, schematics etc. - Making a 16 KB version - Making at least a JiffyDOS version - Bigger disks - Knowing how to do the trick with a 1541, I could do the same trick with a 1571 and 1581. With the 1571 no additional hardware is needed as we can use the onboard 6526! -- ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org =====DISCLAIMER================================================================= De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij overgebrachte virussen. The information contained in this e-mail is confidential and may be privileged. It may be read, copied and used only by the intended recipient. If you have received it in error, please contact the sender immediately by return e-mail; please delete in this case the e-mail and do not disclose its contents to any person. We don't accept liability for any errors, omissions, delays of receipt or viruses in the contents of this message which arise as a result of e-mail transmission. Message was sent through the cbm-hackers mailing list
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