RE: PC as 1541

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: Ruud.C64.org


 
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