More Commodore PET drives - more help?

From: Tony Duell <>
Date: Fri Sep 24 19:10:55 2004

> 1) Commodore SFD-1001
> This is the IEEE-488 (PET) single-drive that looks
> very much like a VIC/C64 1541 serial drive.
> The drive powers on, and both the POWER and drive LED
> come on solid RED and stay that way - no other activity
> is observed - it doesn't matter if the IEEE bus is
> connected or not, and resetting the IEEE bus (via PET
> power-on) has no effect. If the PET tries to access the
> IEEE bus, it hangs, presumably waiting for an acknowlege
> that never comes (?)
> It looks like the on-board CPU is not running at all.

I would guess that's likely to be the case (although I've never worked on
this unit).

In which case I'd start by checking the +5V power rail, then check the
CPU clock and reset pins (make sure the thing isn't held in the reset
state), then see what the aaddres and data lines are doing.

Received on Fri Sep 24 2004 - 19:10:55 BST

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