Re: IEEE interface

From: Andre Fachat (
Date: 1998-09-04 09:23:52

MagerValp wrote:
> Hi,
>   I just received a replacement 6525 so now I have a working IEEE-488
> interface. I have a few questions that I hope someone could answer:
> Is it possible to use IEC devices together with IEEE devices? The 1541
> on device 8 and the 1581 on device 9 just give me a device not present
> error. Currently there's nothing plugged into the IEEE interface since
> I haven't soldered a cable yet.
> There's an 8K ROM in the interface that I'd like to read out, but it
> gets swapped out. How do I swap it in? One of the 6525 registers at
> $dfxx i guess, but which one?

If you have an original CBM IEEE488 interface, you can use
my new kernal. But I have the EXROM/GAME lines disconnected
from the module.... :-)
The schematics is on my homepage and the kernal used is

You can map any of the drives to either serial or parallel IEC bus.

The Software copies itself from the ROM area to $C*** (pretty
unusable...) and then swaps out the ROM. However, I have not
documented the ROM switch, but it should be easy to find out
from the module with a beeper...

hope it helps

Email address may be invalid. Use "fachat AT physik DOT tu-chemnitz DOT de"
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Andre Fachat, Institute of physics, Technische Universitšt Chemnitz, FRG
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