Ah finally I can read my mail again. Couldn'tb read it for the last three weeks due to network renovation and maintenance. Hope I didn't miss anything send to me.
>BTW: The DPU is an 8MHz clock crystal, with an XOR gate (I think - >could be a NAND, its been a while) acting in its non-linear mode to >generate the clock pulses. It's three INVerters instead of XOR gate. >Circuit diagram? Or was Dean's one the one? I made a gif picture of my DPU. Is it allowed to send it to list ? Some additional info: SAM drive with amber LED is a normal 800K drive SAM drive with a red LED is a 1.44M drive The drive led of the 1.44 drive stays on because of a disk controllor flaw. Drive LED burns whenever the the MOTOR ON signal is active. The FDC turn it off after a number of index pulses have passed. When no floppy is inserted the drive doesn't produce index pulses. Once a disk is inserted the FDC can count the index pulses and the LED goes off. On a 800K drives the LED only burns when the motor on signal is active and a disk is inserted. FDC Command &D0 (Forced interrupt, terminates any command in progress). This Command is used at the start of most disk routines to check if theres a disk in the drive. Edwin Blink.
