Date: 2007-12-12 08:33:57
Hallo Jim, > but I thought I read somewhere else you felt the > 16 bit IDE circuit was to complex. Not for me:) No, it is I just like to keep things simple so that other, less gifted people can solder it as well. I actually built a board with the 16 bits design some years ago but the first reaction was: "WOW, very nice. But that is a bit too complex for me :(". About your design: CS1 of the IDE bus is not not needed AFAIK. That I used it in my designs was for the simple fact that other designs used it as well and I wasn't that familiar with the bus. So far things run fine without using it so one could think about discarding it. > ... and I think I may have turned it into a 8/16 bit design ... Pure curiousity: why didn't you use the SCH I sent you as base? For every one else: http://www.baltissen.org/images/1541ide.png > as you need to shift the addresses to the IDE channel <<1, + > My idea is to shift all the address lines up by 1, using A0 > to determine whether one wants the low or hi byte. Sorry to say, but this is a very bad idea IMO. At this moment I store several parameters, like the size of the disk, the start of the directory and the link to the next sector, as four bytes in a row. Copying them to disk can be done like this: ldx #3 1 lda LBA0,X sta IDE_reg,X dex bpl 1 With a shifted address a more complex routine is needed. That's why I used this scheme: A0..3 : basic IDE registers A4 : choosing CS0 or CS1 A5 : high/low byte When I started with the 8 bit design, I could use a lot of the original 16-bits sources as I only had to drop everything conneted with A5. > Since I gate the 74LS42 line through 1 more level of logic, it > might require ALS or H variants for the '139, '244, and '00 parts. No, IDE is very forgiving. Regarding the debug port: I'm busy with soldering two intelligent HP 7-segments displays to the free A port of one of the 6522's. It should display POST codes while everything is working. In this way I can see what part of the Kernal it is executing. In the future the ports of the other 6522 can be used as we don't need the .... WOW, no kidding, the house on the other side of the street is on fire !!!!! .... need this 6522 anymore as we can get rid of the drive. Hallo André, > The problem is the PET memory map Eh, Jack was reffering to the 8250 which is drive IMHO, not a computer. OK, that was just a quick reaction. I'm having another MCSE course this week which means quite some studying in the evening, so I don't have much time for other things. Sorry for that but I'm sure you understand. I have to go again... :( -- ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| URL: Ruud.C64.org 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. Stichting Pensioenfonds ABP is gevestigd te Heerlen en ingeschreven bij de Kamer van Koophandel Zuid Limburg onder nummer: 41074000 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. Stichting Pensioenfonds ABP, having its registered office at Heerlen, is registered in the Traderegister of the Chamber of Commerce Zuid Limburg (Maastricht), the Netherlands, registration number: 41074000 Message was sent through the cbm-hackers mailing list
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