Re: 1540 Prototype

From: Gerrit Heitsch <>
Date: Mon, 24 Oct 2011 20:47:39 +0200
Message-ID: <>
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:
> 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
> 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:


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Received on 2011-10-24 19:00:04

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