Commodore PET disk drive power-up error codes

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Sep 11 14:26:50 2004

>
> 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?

UEs, it's a diagnostic code. From the 8050/8250 service manual (component
references will be different in other drives, I guess )

# flashses

1 Zero Page 6532 UC1,UE1
2 ROM $E000-$FFFF 2364 UL1
3 ROM $C000-$DFFF 2364 UH1
4 Not Used
5 Zero Page 6530 UK3
6 RAM $1000-$13FF 2114 UC4,UC5
7 RAM $2000-$23FF 2114 UD4,UD5
8 RAM $3000-$33FF 2114 UE4,UE5
9 RAM $4000-$43FF 2114 UF4,UF5
10 Cotnroller ROM 6530 UK3 or 6502 UH3

-tony
Received on Sat Sep 11 2004 - 14:26:50 BST