Re: Microsoft Z80 SoftCard Question

["GarberStreet Enterprises" <willy46pa@comcast.net>]

> >     What is Microsoft Z80 SoftCard's red box with four dip switches?
> >     Can it
> > be used in Apple II+, IIe, and IIgs?  Can slot 1 + 2 be used rather
> > than slot 4?
>
> The manual(1980) says "You may plug the card into any unused slot(except
> slot zero)"
>
> The 4 switches
> S1-1 Address offset  (Normally off)
> [ lets Z80 address contiguous from $0000-$DFFF when actually using Apple
> memory $1000-FFFF (avoiding zero page $0000-$0FFF and $C000-$CFFF pages)]
> when on memeory addresses are not shifted.
>
> S1-2 Z80 DMA Enable (usually off)
> when off it preserves the interrupt daisy chain
>
> S1-3 Non-Mask Int (usually off)
> S1-4 Z80 Interrupts (usually off)
> when on the Z80 will be able to respond to interrups in the Apple.

I also checked the docs on Apple Knowledge Base for you,
and they recommend "Normal" speed on the IIgs.

Bill @ GarberStreet Enterprises
http://garberstreet.netfirms.com



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