> It sounds harder to me. As well as everything else you have to work out > which port to read from next...
Oh, it's dead easy... one port is the upper byte of the word, the other is the lower byte and transmit port -- the upper one is the receive port, the lower just reads from the latch... or something like that.. Anyway, Martin's nearly finished the schematic for the new one sooo... > If you've asked for some data, then you presumably know what it is so why > isn't it easier to read it all from the same port? Because, to save on logic, we have no way of resetting the system to a default setting -- ie we can't say "instead of reading new data, I want to read the high byte of the word this time round... in that kind of sytem you *always* have to do Read low byte, read high byte, read low byte... etc... > Even if it is, then why not get the drive to write out the sector data with > only one byte per word so that you only need one port? Yeah.. and reduce the size of the drive by half? Only some machine support that function -- a lot of them treat the register that handles it as a write precomp register, and ignore it... > imc > Si
