On Mon, 5 Jul 1999, Ruud Baltissen wrote: > I once connected a MGP-card to my C64. The card disappeared during moving from > one houde to another. > If the sound blaster only uses I/O, one half of a 74LS39 will do the trick. > Connect the PHI2-clock with input A and the R/W-line with input B. Output C > reflects the needed WR-line, output D the needed RD-line. Connect the IRQ-input > thru an invertor with IRQ5 of the card. The only thing I don't have a solution > for is the DMA. > You must hardwire the addresslines A8 and A9 so that the card sees the range > $200-2FF. The AEN-line is connected to PHI2-clock AFTER it has been inverted. Can you point me to an ISA bus reference? I'm afraid I know nothing about how it works - whether it's multiplexed or not, what the timing of the address lines, READ# and WRITE# lines is like, how DMA request and acknowledge lines work, etc etc etc > For those interested how I connected the MGP-card which needs RAM-addressing as > well: I added a 8255. Two ports I used for A8..A19 and one line I used for > telling it was an I/O- or Memory-operation. The other lines I used to read the > IRQ-lines of the ISA-slot. These lines were connected to the IRQ-input of the > C64 thru a NOR-gate. I propose that the SoundBlaster 64 interface use non-Plug'n'Play cards configured for the 'normal' SoundBlaster settings - ie. 220h - 22Fh, certain IRQs and DMAs. Richard - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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