Commodore PET disk drive power-up error codes

[Tony Duell]

> 
> 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