Gregory's Serverand yes, the hard drive is vaguely like IDE but it uses the Micro Channel bus instead of ISA. IBM called it DBA (direct bus attach) ESDI. this drive uses the POS ID code DF9F.
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  @tubetime All this is making me miss my old Thinkpad 701 Butterfly. Damn that keyboard design was so neat. the operation won't start until the parallel port is ready--i had to pull the BUSY line low with a jumper, and now i instantly get this error! good luck figuring that one out  @tubetime @tubetime I'd really like the W variant to use external bubble memory just 'coz 1980s Intel. 🙂 But what the heck is it, only thing I can see is a Japan fab variant mentioned here: https://www.cpu-galaxy.at/cpu/Ram%20Rom%20Eprom/Microcontroller/Intel%208X196%20section.htm Even the 8XC196Lx Supplement PDF linked there does not mention it.  @tubetime *takes out a bucket of popcorn*   @tubetime I don’t know why I’m surprised that IBM used MCA in ThinkPads, but it does make sense!  @tubetime Where's the code setting up the DMA channel so the parallel port doesn't read/send data from the weeds? :D @tubetime for a second there I forgot these use the aptly-nicknamed "ThinkPad 700 drive". What a cursed thing it was, DBA-ESDI 2.5". |
i needed to figure out which interrupt lines were which, so i wrote a quick and dirty program to detect when an interrupt fires. then i manually triggered them by grounding each pin in turn.