--- Richard Atkinson <email@example.com> wrote: > On Sun, 18 Apr 1999, Ethan Dicks wrote: > > > > The schematic of the original board suggests that there is a PAL/NTSC > > > jumper, > > 1.0Mhz, IIRC. > > The NTSC VIC-20 runs at the same speed at the NTSC C64... I don't think that's correct. In my original 1541 manual, it mentions the U+ and U- commands to change the IEEE speed to match VIC-20 or C-64 speeds. I think the VIC-I and VIC-II chips have a different impact on their respective systems. > I need to search out these early VIC-IIs and rather quickly, for my VIC-II > reverse-engineering project... You are trying to fully define the chip to reproduce its behavior for an emulator? > I'm particularly looking for a 6567R5 and this plain '6567' > if indeed it hasn't just had the revision number scratched off. This VIC chip does not have the number scratched off. It's too close to the right edge of the lid for any other numbers to follow the 6567. When I unearth my tacklebox full of C= chips, I'll check to see what's in there. If you don't hear from me in a week, feel free to send me mail. I don't mind swapping anything out of the tacklebox, but I'd like to hang onto this board intact. Somewhere in the house, I've got the case for it... S/N 00002354, IIRC. I was told in 1982 that C= started production with the number 2001 in tribute to the PET, but that could just be a myth. -ethan _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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