ATN trap needed for C128 as well?

From: Baltissen, GJPAA (Ruud) <>
Date: Thu, 23 Feb 2012 15:43:08 +0100
Message-ID: <>
Hallo allemaal,
I was given a PC case made of Perspex. It is quite wide and that gave me
the idea of placing a C128 left of the drives and in such a way that all
connectors were accessible. As the C128 was placed on the left side,
there would be no room for the original PC board. But before cutting the
needed holes, I got the weird idea to exchange the side plates and turn
the back plate upside down. This still enabled me to install a PC as
My IEEE drive emulator originates from Server64. At that time I replaced
the IEC routines by IEEE ones. The idea rose to add the IEC routines so
I could use this PC as IEC drive emulator. I started with the original
program to make sure things worked out fine. But it didn't. two
problems: after a reset READY wouldn't appear until I disconnected the
cable and directories didn't appear on the screen as they should. (I
didn't try more things) I remembered that that happend as well when I
tried to improve the program 15 years ago. But at that time I bcame more
interested in the CBM's and decided to use for IEEE drives alone.
But yesterday evening I booted the C128 into the 64 mode by pressing the
C= key and things ran fine, but why ???
Today I had a look at CBM-HD to see what I had to change. With an
exception everything was quite low-level so I didn't forsee many
problems. The exception were the routines to de/activate the ATN trap. I
first thought about adding a line in the sprit of "if it is an IEC
devive, simply exit the routine now". But then I realised that this
phenomen looked like the problems I had with the IEEE drives years ago
(that is, IIRC). If this is indeed the case, I have to have another look
at the software to see if I can create a ATN trap there: Nick Coplin's
64HDD can do it as well! In the worst case I have to tinker a bit with
my hardware.
But I have no idea what causes the C128 NOT to start up as long as the
PC is connected. I see on the screen that Server64 goes into action the
moment the C128 has been reseted but haven't any idea yet what it is
waiting for. Anyone an idea (could save me some time)?
Many thanks!
    / __|__
   / /  |_/     Groetjes, Ruud
   \ \__|_\
    \___|       URL:

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Received on 2012-02-23 15:00:07

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