RE: Data transfer methods

From: Baltissen, GJPAA (Ruud) (
Date: 2005-05-09 16:30:49

Hallo Marko,

> Your page basically says "email me for details"; it does not
> contain any schematic diagrams or offer any source code (or even
> executable code) for downloading.

It is all available at  <> now.
Please have a look at it and give me your comment.

The layout of the page is not 100% OK yet. I just got some feedback from
Spiro which I still have to put into the text.

Regarding the program: It works fine with the exception of one feature: the
CBM-DOS mode. CBM-HD supports the DOS mode which means access to any
DOS-file but, unfortunately, only in 8.3 format. CBM-DOS should enable one
to use the CBM naming convention by means of a table that keeps track of the
user provided name and the real name under DOS. But implementing this
feature caused much more trouble then expected.

Regarding the hardware: there are four different cables. All of them have to
be connected to a COM- and a LPT port. Why four? Partly historical reasons
but in fact you could say that three of them are the IEEE equivalent of the
X1541 (version 1), XE1541 (version 3) or XA1541 (version 4) cable. Have a
look at the schematics and you probably will understand.
Version 3 and 4 are 'transistor only' cables. The 'why' is explained in the
text. I'm thinking about making a TTL version but that means it needs a
power supply. But these new versions will be full compatible to the original
Version 2 is based on an integrated COM/LPT port. That can be a older ISA
card but I also already used the onboard ports of a Pentium-75 MHz
motherboard. In these particulary cases the transformed MB and card could
run the same software. In fact, by adding some extra invertors, I could have
made them behave like a version 1 cable (but I discovered that to late). But
that is not always possible so therefore I only mentioned it, not giving a
ready software solution.
Version 2, 3 and 4 can be used under CBM-HD and the future IEEE version of
Star Commander. Version 1, as it is now, can only be used for CBM-HD. A
version 1 that can be used for SC as well is possible, but then I have to
make a full transistor version of it as well.

Looking forward to your comment.

    / __|__
   / /  |_/     Groetjes, Ruud
   \ \__|_\
    \___|       URL:


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