Re: z80 card dip switches

[Marsha <menacechgo@aol.com>]

[posted and mailed]

jon@i-manila.com (Jon Co) wrote in 
a2c2f792.0303090854.570f3c16@posting.google.com:">news:a2c2f792.0303090854.570f3c16@posting.google.com:

> Also, I did some experimenting and plugged the working card into my
> IIGS, and of course it didn't work.  either screen full of garbage or
> "cannot detect z80 softcard"

from http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-
8&selm=c_qdnYUyUOVoa_ujXTWcog%40comcast.com

> 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