Gregory's Serverjust have to move this hacked up ST-225 logic board over. it's cabled to an Arduino that runs the stepper motor so i can get to the hidden tracks.
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 looks like this came out of an Apple system. this is on track 0 which is user data. track -1, head 0, sector 19 contains the drive serial number as ASCII text. interesting. track -2 contains the same 32 sectors on all heads. it seems to be 8051 code (02 is the LJMP instruction). i'm guessing this is the main drive operating code.   @tubetime Lot of drives had the firmware on hidden tracks. I am entertained that it's an 8051 though. The newer drives got much better CPU  |
it spins up and i've captured the negative tracks! (the Marker bit is a signal pulsed by the Arduino when it changes tracks or heads. it just cycles through all the heads in order, then goes to the next track)