RE: PC as 1541

From: Baltissen, GJPAA (Ruud) <>
Date: Wed, 27 Apr 2011 08:48:24 +0200
Message-ID: <>
Hallo Spiro,

> Adding to the question of Ruud: ...

Reading your comment and rereading my question I realize it can be
misunderstood. The original I/O accesses of a PC can be slow, as slow as
only 500 KHz. This is one of the reasons I built some memory mapped I/O
in the past: 8 MHz or faster access :)
If these newer cards can handle DMA, IMHO they must have faster I/O
access as well. This faster I/O access, and not the DMA, was in my mind
when I wrote my previous message.

> BTW, the 1541EMU uses another trick: It helps with hardware, using
> the same "ATN trap" as present on an original 154x, 157x or 1581,
> using an XOR gate. 

I had problems with CBM-HD for years until someone of CBM-hackers
suggested to build an ATN-trap. Why can't this idea be used here as
well? This would mean that any LPT port can be used IMHO.

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

De informatie in dit e-mailbericht is vertrouwelijk en uitsluitend bestemd voor de 
geadresseerde. Wanneer u dit bericht per abuis ontvangt, verzoeken wij u contact op te 
nemen met de afzender per kerende e-mail. Verder verzoeken wij u in dat geval dit 
e-mailbericht te vernietigen en de inhoud ervan aan niemand openbaar te maken. 
Wij aanvaarden geen aansprakelijkheid voor onjuiste, onvolledige dan wel ontijdige 
overbrenging van de inhoud van een verzonden e-mailbericht, noch voor daarbij 
overgebrachte virussen.

APG Algemene Pensioen Groep NV is gevestigd te Heerlen en is ingeschreven in het 
handelsregister van de Kamer van Koophandel Limburg onder nummer 14099617

The information contained in this e-mail is confidential and may be privileged. 
It may be read, copied and used only by the intended recipient. 
If you have received it in error, please contact the sender immediately by 
return e-mail; please delete in this case the e-mail and do not disclose it's 
contents to any person. We don't accept liability for any errors, omissions, 
delays of receipt or viruses in the contents of this message which arise as a 
result of e-mail transmission.

APG Algemene Pensioen Groep NV is registered in the trade register of the Chamber 
of Commerce Limburg, The Netherlands, registration number: 14099617

       Message was sent through the cbm-hackers mailing list
Received on 2011-04-27 07:00:07

Archive generated by hypermail 2.2.0.