On Sat, Jul 23, 2016 at 06:29:33PM +0200, Michał Pleban wrote: > > Next project would be a replacement 8501 since those also die easily... > > That should be much easier, as no analog stuff (video) is needed and a > 6502 core is easily obtainable... Somebody should really make such > project :-) The visual6502 project has a die picture of an 8501. From the picture it seems clear that both the 8500 (c64c) and 8502 (c128) used the same silicon, with different contacts bonded out. <http://visual6502.org/images/pages/MOS_8501_die_shots.html> From the top left (counting the corner as "left"), going counter-clockwise, you have: left: AEC Vcc A0 A1 A2 A3..A10 bottom: A11 A12 A13 Vss A14 A15 GATE P6 P5 right: P4..P0 D7..D3 top: D2 D1 D0 R/#W PHI2 #RES PHI0 RDY #IRQ SYNC #NMI 8500 does not have GATE P6 SYNC 8501 does not have PHI2 SYNC #NMI 8502 does not have GATE PHI2 SYNC (I am not sure "SYNC" really is SYNC; it is an output only though). Segher Message was sent through the cbm-hackers mailing listReceived on 2016-07-23 18:22:18
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