>> >positive half of PHI2. The trick is to slow down the rising edge of PHI2 >> >using the DOT-clock. Connect the DOT-clock to the CLK-input of a 74, [..] >> This explains why my attempts to interface an LCD controller directly to the >> bus using the 6502 method in the datasheets was such a failure :( >I used a simpler method of combining PHI2 and _I/Ox to make a latch >enable signal when I made a 256kB RAM expansion ~15 years ago. Looking at the MagicDesk and SuperGames schematics the Commodore way seems to be to do something similar using a 74LS139 chip. Now its clear why! PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your co-operation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such is explicitly the case (C) 2000: Orbital Engine Company (Australia) PTY LTD and its affiliates Message was sent through the cbm-hackers mailing list
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