Re: 1540 Prototype

On 10/23/2011 11:11 PM, Mike Naberezny wrote:

> I have what appears to be a 1540 drive prototype.
>
> Here are some photos of the board:
> http://mikenaberezny.com/hardware/1540-prototype
>
> Externally, it is a 2031S (a single full-height 5.25" drive for PET/CBM
> in a metal case). Unlike a normal 2031S, this drive has a completely
> different circuit board and has an IEC port instead of IEEE-488.
>
> The top of the board has the markings:
>
> ASSY 15400000
> SERIAL FLOPPY CONTROLLER
> (C)1980 COMMODORE INTL
>
> and on the bottom:
>
> FAB 1540001
> ARTWORK 1540000
> REV 1
>
> The board is unlike any production drive I've seen. It has no solder
> mask and looks like it was soldered by hand. It has a few trace cuts and
> fixes. It's clear that the board was made specifically for the 2031S
> chassis and the full-height drive.
>
> I have not powered it up. A previous owner has installed a 6502 where a
> 6522 should be. It also has the ROMs for a 2031 installed, which can't
> work with the IEC interface. I plan to compare the board against the
> 1541. If it's close, I'd like to try and bring it up with the 1541 ROMs.
>

Great find! Keep us posted if you can repair it and make it work with 
the 1541 ROMs. You might want to compare the board to a 1540/41 long 
board though since that one is all TTL like yours and doesn't have the 
40pin Gate Array of the 1541 short board. Here are pictures of one:

  http://sid.fi/~tnt/c64/pic/VC1541_PCB_top.jpg

  http://ist.uwaterloo.ca/~schepers/CABLEPIX/1541/1541LB.JPG


Gerrit


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