ray@ariel.ucs.unimelb.edu.au (Douglas Ray) (05/11/91)
I've just got one of these (8 bit da/ad) cards: has anyone already worked out how to run one from the i/o ports (as opposed to using the supplied software)? Or has anyone disassembled the library routines rec8 and say8? I'd rather avoid disassembling the binary. Also, the encoding format: 2's complement? - douglas doug@unimelb.EDU.AU
ray@ariel.ucs.unimelb.edu.au (Douglas Ray) (05/13/91)
From article <652@ariel.ucs.unimelb.edu.au>, by doug@unimelb.edu.au (Douglas Ray): > I've just got one of these (8 bit da/ad) cards: has anyone already > worked out how to run one from the i/o ports (as opposed to using the turns out this is easy. Just read from or write to the port; there's no interrupts to tell you when data's ready or such, it just goes as fast as it can. Card uses all standard chips: NS ADC0804, and so forth. encoding is 8 bit: FF h -> +1 80 h(or 7F) -> 0 00 h -> -1 and I think linear but not certain. - douglas doug@unimelb.EDU.AU