Re: Need help identifying 1541 drive mod

Wolfgang Moser wrote:

Steven Hirsch schrieb:

I picked up (2) VIC20s and a "VIC-1540" disk drive at a flea market. When I got it home, I discovered that the drive (which says 1541 on the front, BTW) has some sort of modification installed.

many congratulations for this great pickup. If the drive
tells it would be a 1541 at the front, but being a 1540
at its back label, then it probably is an early VIC-1541
and the front label should tell "VIC-1541" instead of
VC-1541 or just 1541. And it should contain the so named
"long board" PCB; description from the parts lists is:

1540007 P.C.Board 315x155x1.6t MTL: Glass Epoxy G-10

That is what I'm seeing. Nice to know it's somewhat collectable!


Pin 22 is bent up from the board and one clip is on it.

That's the R/W line

The other intercepts Pin 23 (which is still connected to the PC board).

Which is named /CS2, being the active low chip select
signal for the VIAs.

I apologize! In my haste, I counted from the wrong side of the chip. The clips are actually on Pin 18 & 19.

Peter Schepers may be right with the ROM, that it is
that Flash! speeder. As for the cables conected to
the VIA I really don't know. It doesn't look like a
parallel cable extension, although I know of a C64
expansion port extender card called FloppyFlash which
comes with a dedicated 6522 to build the other end
for such a parallel cable.

Maybe it is that "CableCard" as mentioned in the
1541-Flash! manual from:

http://www.zimmers.net/anonftp/pub/cbm/manuals/drives/1541-Flash!.txt

I've since discovered that I'm missing the adapter board on the computer end :-(. I bought what I thought was the entire collection of C64/VIC-20 related stuff from this guy, but must have missed the Flash! adapter. Drat.

Another tip: If the drive is working with the
Flash! enabled, you may connect it to a C64 and read
out the error channel just after the drive got
switched to on. That way you can read out the drive
identification string which may help us to verify
out assumptions. From:

http://www.infinite-loop.at/Power20/Documentation/Power20-ReadMe/AB-Floppy_Commands.html

Thanks for the tip!

Steve
.

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