Re: odd cards

[Patrick Schaefer <Patrick.Schaefer@topmail.de>]

Paul Grammens schrieb:

> This may be true, but the Mac Plus is one of the earliest computers to use
> SIMMs,
> (1986?) and only uses 1 meg SIMMs max.  Yet I just tried, and 3 chip SIMMs
> from a PC work fine in the Mac Plus. I tried several sets, and had no
> problem booting and running applications.

The Plus takes its video information from the main RAM, like the Apple
II series. This is your refresh signal. If the video area is big enough
to cover the required number of address lines, 3chip SIMMs will work.

The same applies to the Apple ][plus. The four rows of 4116 chips can be
replaced by a single row of 4164 (this is done in the IIe), because the
video timing generator provides the required refresh cycles.


Patrick