Re: Microsoft Z80 SoftCard Question

[Marsha <menacechgo@aol.com>]

[posted and mailed]

"Bryan Parkoff" <BParkoff@satx.rr.com> wrote in
Z_ucnWuMfM6GSvujXTWQlg@giganews.com:">news:Z_ucnWuMfM6GSvujXTWQlg@giganews.com: 

>     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.