Re: IEEE interface

From: Andre Fachat (a.fachat_at_physik.tu-chemnitz.de)
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
on http://www.tu-chemnitz.de/~fachat/8bit/c64/kernal/index.html

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
Andre

-- 
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Andre Fachat, Institute of physics, Technische Universitšt Chemnitz, FRG
		http://www.tu-chemnitz.de/~fachat
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