Re: companion product for GSBarnDoor

[mdj <mdj.mdj@gmail.com>]

On May 19, 4:23 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:

> I'm not sure how the IIgs fast memory operates, except that accesses
> run at 1MHz when they occur to addresses "shadowed" in the "slow"
> RAM space of the traditional Apple II.

I was under the impression a more 'usual' approach was used with the
DRAM controller stealing some cycles for refresh purposes.

ISTR this makes the effective bandwidth of fast memory closer to
2.5Mhz than 2.8, which due to the nature of the 65xx series
effectively means the IIgs's processing speed is effectively 2.5Mhz
(ish)

Matt