Hi, Frankly I would have a terrible pleasure to drop a commodore pc In an active volcano .... Commodore and PC ... contradiction the terms... Hopefully I stopped working on commodore before I saw this error... euh horror... Lol have fun :=) -- didier -----Message d'origine----- De : email@example.com [mailto:firstname.lastname@example.org] De la part de Ruud@Baltissen.org Envoyé : mardi 18 octobre 2011 21:33 À : email@example.com Objet : Hacking a Commodore PC10-III Hallo allemaal, Most of the time we are talking about hacking the C64, PET, CBM, etc. with as latest "victim" the Plus/4. To be very honest, after twenty years of 6502 I was a bit fed up with all the 6502 related stuff. And having various Commodore PC's on the shelf doing nothing at all, I decided to give them a bit more of attention. For example, I wanted to find a better replacement for onboard harddisk than the old 20 MB MFM I had. Indeed "had" because it just died two days ago. So I started to disassemble the BIOSes of the PC 10/20- III and the PC-1 By accident I could lay my hands on a XT-IDE card: http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=XT-IDE I equiped it with the XTIDE universal BIOS: http://code.google.com/p/xtideuniversalbios/ After some puzzling I was able to replace the original code for the unusable 8 bits IDE harddisk with the above one. Advantage: now I can solder the relative simple IO interface W/O the need for the onboard ROM. I attached a 2.5 GB HD and installed MS-DOS 5. FYI: I chose the 2.5 GB one for the simple reason it made the lessest noise of all harddisks I have. MS-DOS 5 supports UMB (= upper memory block), memory between the "famous" 640 KB limit and the maximum of 1 MB. Something the PC 10-III doesn't have so I added an old IBM memory expansion card, adding 64 KB in the 0Exxxx area. But this memory needs to be initialised as well. So I added the needed routines to the BIOS as well. Now I have to install my 23 years old UMB software and see if things work out fine. I have no doubt here as I have done this 20 years ago as well but with an IBM AT. Next steps: replace the 8088 with a NEC V20 and installing a 8087. And maybe a VGA card, less original but the original IBM CGA screen weights about a ton :( If interested, all sources are free! Next project: doing the same for my PC-1, just for fun! And then I'm going to pay attention to my just bought CMD hard disk, which is 6502 again :). -- ___ / __|__ / / |_/ Groetjes, Ruud Baltissen \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2011-10-18 22:00:14
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