Commodore PET disk drive power-up error codes

From: Paul C. Mirams <>
Date: Mon Sep 13 13:43:26 2004

Here are the codes for the 8050/8250

The 6 flashes indicate a failure in the first bank of 2114 memory.


-----Original Message-----
[]On Behalf Of Dave Dunfield
Sent: Saturday, September 11, 2004 1:27 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Commodore PET disk drive power-up error codes

Hi Guys,

Does anyone have information on error-codes that are flashed by PET disk drives
after power-up diagnostics fail.

I have a drive set which after powerup, enters into a state where it flashes the
POWER LED alternating with both drive LEDs (together) - It repeats this flash
cycle exactly 6 times, then pauses, then another 6 ... forever.

I assume it's a diagnostic failure - Can anyone tell me what it means?


dave04a (at)    Dave Dunfield
dunfield (dot)  Firmware development services & tools:
com             Vintage computing equipment collector.
Received on Mon Sep 13 2004 - 13:43:26 BST

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