NETOPRBH@NCSUVM.BITNET (Brandon Hill) (09/07/89)
Does anyone have any info on the 6522 I/O chip (the one used in the 1541) ?
I have a couple off of a dead 1541, but no specs on them. I do have fairly
detailed specifications on the 6526 (used in C64 and 128), but i think that
the differences are enough that I should not trust the pin-outs to be similar.
Even just a pin-out description of the chip would be helpful. Are there any
reference books with this information?
BlHscott@max.u.washington.edu (09/08/89)
In article <915NETOPRBH@NCSUVM>, NETOPRBH@NCSUVM.BITNET (Brandon Hill) writes: > Does anyone have any info on the 6522 I/O chip (the one used in the 1541) ? > I have a couple off of a dead 1541, but no specs on them. I do have fairly > detailed specifications on the 6526 (used in C64 and 128), but i think that > the differences are enough that I should not trust the pin-outs to be similar. > > Even just a pin-out description of the chip would be helpful. Are there any > reference books with this information? > BlH Yes I believe there are. Here are some titles of books that might be of help to you: Commodore 1541/VIC 1541 Computerfacts from SAMS (photos, schematics of hardware, tips) Commodore 1541 Disk Drive from SAMS Trouble Shooting & Repair Guide 1541 Repair and from Abacus Software Maintenance Guide The Anatomy of the (more software oriented with ROM listings, 1541 Drive Book description of the DOS, but perhaps hardware specification too.) Once again, I don't want to play favoratism by mentioning any sources where you can obtain this books, but most companies that carries commodore hardware and software should have them. Check inside commodore magazines for mail order companies if your local sources don't carry them. Also check your local commodore repair centers (in the phone book) if they have and sell these books.
seven@nuchat.UUCP (David Paulsen) (09/09/89)
In article <915NETOPRBH@NCSUVM> NETOPRBH@NCSUVM.BITNET (Brandon Hill) writes: >Does anyone have any info on the 6522 I/O chip (the one used in the 1541) ? > >Even just a pin-out description of the chip would be helpful. Are there any >reference books with this information? > BlH I'm looking at page 107 of _The Complete Commodore Inner Space Anthology_, a book published in 1985 by Karl Hildon, once-editor of The Transactor. Page 107 contains pinouts for most (if not all) of the Commodore chips, including the 6522 and 6526. The 6522 is remarkably like the 6526, with the following exceptions: PIN 6522 6526 ------------------ 18 CB1 PC 19 CB2 TOD | 23 CS2 CS 24 CS1 FLAG | 26 D7 DB7 27 D6 DB6 28 D5 DB5 29 D4 DB4 30 D3 DB3 31 D2 DB2 32 D1 DB1 33 D0 DB0 | 39 CA2 SP 40 CA1 CNT Beyond that, the book does not say much more. David -- David Paulsen ..uunet!nuchat!seven ||| The Curiosity Shop BBS, 713/488-7836 ------------------------------------------------------------------------------- "She moans. He moves the camera up, slowly, deeper inside her, f/22 at 1/60th of a second..." --Dark Thoughts, from the Mind Of Minolta
jb@cbmtor.UUCP (Jim Butterfield ) (09/10/89)
from programmer's standpoints, so you don't get pinouts or timing diagrams. -- -- M: My boss doesn't understand me... : Jim Butterfield, Toronto : : .. and I'm my own boxxss! : cbmjb@cbmtor :
jb@cbmtor.UUCP (Jim Butterfield ) (09/10/89)
** the line-eater got me !! ** trying again ** If you can find it: Vic-20 Programmer's reference Guide, pages 218 to 226 Or: Machine Language for the Commodore 64, 128, and Other Commodore Computers (Jim Butterfield), appendix I. Both the above are written from a programmer standpoint, so no pinouts or timing diagrams. --jim -- -- M: My boss doesn't understand me... : Jim Butterfield, Toronto : : .. and I'm my own boxxss! : cbmjb@cbmtor :
Geoffrey.Welsh@p0.f171.n221.z1.fidonet.org (Geoffrey Welsh) (09/11/89)
> From: NETOPRBH@NCSUVM.BITNET (Brandon Hill) > Message-ID: <915NETOPRBH@NCSUVM> > Does anyone have any info on the 6522 I/O chip (the one used in the 1541) ? > I have a couple off of a dead 1541, but no specs on them. I do have fairly > detailed specifications on the 6526 (used in C64 and 128), but i think that > the differences are enough that I should not trust the pin-outs to be > similar. > > Even just a pin-out description of the chip would be helpful. Are there > any > reference books with this information? The 6522 VIA (Versatile Interface Adapter) should be documented to some degree in almost any book about the 6502. It was used in the PET and thus should feature prominently in such books as "Programming the PET/CBM" and "The PET Revealed", not to mention "The Complete Commodore Inner Space Anthology". If you can't get a hold of these publications, email me (izot@zswamp) and I will send you any specific info you're after. -- Geoffrey Welsh - via FidoNet node 1:221/171 UUCP: {{uunet!}watmath!xenitec!}zswamp!171.0!Geoffrey.Welsh ARPA: Geoffrey.Welsh@p0.f171.n221.z1.fidonet.org
martens@ketch.cis.ohio-state.edu (Jeff Martens) (09/17/89)
Another place to get info on really old chips like the 6522 is in the KIM-1 manual set. I've got it in a crate somewhere at my parents house, and could dig them up over Christmas if anyone's really desparate and patient. Alternatively, I'd expect these to be in some university libraries, or just look for other 30ish former hackers like me ;-). -=- -- Jeff (martens@cis.ohio-state.edu) Reagan had brain surgery? They didn't let Igor pick out the brain again, did they?