Re: Mystery Card...

[James Noyes <jnoyes@quality.NOSPAM.net>]

Tom Kelly wrote:
> I am very curious how you use the ROM card in a IIe.
>
The card works perfectly, just as is.  I put it in slot
3, and switch the switch as necessary.

> The II+ had at max 6 ROMs at 16k each (96k).

The II and II+ had (up to) 6 ROMS at *2K* each, for a
total of 12K.  They map into the address space from
$D000 through $FFFF.

> The IIe has 1 128k or 2 64k ROMs (128k total).

The //e has two *8K* ROMS, or one *16K* ROM.  They
map to the address space from $C000 through $FFFF.
The area from $C000-$CFFF is expansion ROM, and is used
primarily for 80-column and extended memory functions.

> How do you make it work?

As mentioned above, I just plug it in and turn it on.
With the ROM card active, it overrides the motherboard
ROMs from $D000 through $FFFF, giving the machine the
personality of whatever ROMs are on the card.  The
expansion ROM from $C000 through $CFFF stays usable, so
80-column and extended memory functions still work.
It's totally transparent to the machine, and REALLY
slick.  IMNSHO.

James Noyes
(jnoyes@quality.NOSPAM.net)

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