Geoff Oltmans wrote: > Willi Kusche wrote: > > > > Hi! > > > > First of all, the 8032 has only 32K of RAM. Video RAM lives at $8000. > > The BASIC, screen editor and kernel logic live in ROMs at $B000 to $FFFF. The > > 8032 has sockets for two 4K ROMs at $9000 and $A000. Those Oracle and > > Paperclip ROMs must be in the $9000 and $A000 sockets. > > Whenever one of my PETs won't boot up properly, carefully removing and > > re-inserting all socketed chips usually fixes the problem. But you're getting > > the startup chirp so it sounds as if your problem is in the video circuitry. > > Well, this one has 64KB. No lie. > > There's a little board that goes on top (with the CPU on it) has four > rows of 8 4116's. In my book, that's 64KB. :) So I guess looking at the > motherboard, that means I've got 96kb! :) So it seems you have a 8096 instead of a 8032. This model uses an extension board to expand the RAM to 96, with a special banking scheme. For this see the PET index at http://www.tu-chemnitz.de/~fachat/8bit/petindex/petindex.html But if it has, in addition to the RAM, a 6809 CPU and a 6551 ACIA you have a SuperPET instead. Andre P.S.: Ahm, if you are able and willing to reverse-engineer the schematics to this board... Ok, probably asking too much. It's just one of the very few schematics missing on ftp.funet.fi/pub/cbm. -- Email address may be invalid. Use "fachat AT physik DOT tu-chemnitz DOT de" ------Fight SPAM - join CAUCE http://www.cauce.org------Thanks, spammers... Andre Fachat, Institute of physics, Technische Universität Chemnitz, FRG http://www.tu-chemnitz.de/~fachat - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
Archive generated by hypermail 2.1.1.