Hi, The P500 roms should be considered BETA. There must have been some hardware issues in the early prototypes because commodore had to put in a loop in the screen writing routine. IE: write a byte, loop until you verify the write was successful. Luckily they seem to have got the hardware fixed, but apparently forgot to remove the loop. Here's some info: http://www.davidviner.com/cbm3.html?name=Discoveries+Part+2 It says the loop can be removed and will double the speed of screen writes... At some point I was hoping to patch the ROMs and release an updated kernal. It should be fairly trivial. Here's a disassembly of the rom: http://www.von-bassewitz.de/uz/oldcomputers/p500/rom500.s.html Steve >________________________________ > From: Christian Dirks <Toast_r@IdeaLine.info> >To: cbm-hackers@musoftware.de >Sent: Tuesday, November 6, 2012 4:15:04 PM >Subject: P500 > >Hi, >a few days ago I got a P500 mainboard. >The brun-in test showed a bad DRAM in bank 2, but only because it was a bit loose in it's socket. >Someone soldered sockets to bank 2 and 3 and populated it with DRAMs. >The test does not show errors anymore, but I think there maybe some issue. >The screen scrolling seems very slow to me. >Since I haven't seen a working P500 before, I don't know, if it is alwas that slow. >The ROMs are -02's. > >Does anybody have a spare case and/or a psu (230V) which he could offer ? > >Is there any software around beyond the burn-in program ? > >-- Christian Dirks >Toast_r@Idealine.info > > > > Message was sent through the cbm-hackers mailing list > > > Message was sent through the cbm-hackers mailing listReceived on 2012-11-06 22:00:56
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