RE: Article PC-card
Date: 2001-03-01 14:50:19

On Thu, 1 Mar 101 wrote:

> > Correct me if I"m wrong, but the ISA bus's only NMI line, per se, is the
> > parity error line.
> As I said before, I develloped a card for the PC where we deliberatly used 
> the NMI line. I don't see why other designers could not have done the same. 
> FYI: handling the NMI interrupt is, just like with the C64, a matter of 
> software. You only have to bend the vector.

I dont even want the c64 to GET the nmi.  Perhaps a latch that can be set to
mask it?  The idea isnt to block the NMI (is there a separate nmi line? I
didnt notice), but to block the parity error signal.

> >   Since the c64 wont be generating parity (anyone got a
> > parity gen circuit?), 
> Here you got me confused. The idea is to connect a PC-card to the C64, not 
> to connect a C64 to a PC ????

The idea is to put the c64 on an empty isa bus as the primary isa bus

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