VIC-1011A (fwd)

From: Marko Mäkelä (
Date: 2001-05-28 12:49:01

Hello Colin,

I think that I got such a cartridge about two years ago.  I haven't tested
it, since I prefer to use my Digital VT-420 or VT-220 terminal.  Is there
a halfway decent terminal program for the VIC-20?  I think that the
VIC-1011A is a genuine VIC-20 product.

I'm forwarding your message to the cbm-hackers mailing list, in case
someone has anything to follow up to the discussion.  Note to cbm-hackers
audience: please remember to add a Cc: to Colin.

I didn't know that the RS-232 interface of the plus/4 user port was
pin-compatible with the software-emulated interface on the C64 and VIC-20
user ports, but it sounds plausible.

When it comes to wiring diagrams, you can find simpler ones at
I like especially the one described in the file
To my knowledge, its acceleration only works in the C64 and C128.


---------- Forwarded message ----------
Date: Sun, 27 May 2001 10:25:56 +0100
From: Colin McCormick <>
Subject: VIC-1011A


In the various lists I have seen of VIC20 cartridges, I am yet to see 
the serial adaptor (not a ROM cartridge of course), part number VIC-1011A.
I have one of these devices, and I think it is probably quite rare.  I 
can't prove however that it was not really a C-64 vintage device.  I've 
used it
in the past to connect a C/Plus 4 to a mainframe, which certainly 
produced a few chuckles at the time.  The plastic case was clearly 
intended for
a VIC-20/C64 shaped computer since it fouled the Plus/4 and had to be 
temporarily removed.

Is this device documented anywhere?  If you would like more info such as 
wiring diagram and pictures, just let me know.



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