Re: Whats a ROM card?

["Charlie" <charlied@NOSPAMbboard.com>]

"Matthew S. Carpenter" <msc1983@mac.com> wrote in message
B785E5D3.9ECB%msc1983@mac.com">news:B785E5D3.9ECB%msc1983@mac.com...
> Hello,
>
>     I was going through all the things I got with My IIGS, and I opened up
> this one box, and found a card and what looks like a bunch of chips that I
> guess you're supposed to interchange on the card.  The card is labeled as
a
> "ROM CARD", it was made by Apple Computer.  I'd say its quite a bit older
> than the IIGS though, it has a copyright date of 1978.
>
> Here are some pictures.
>

Plug it into slot 0 on an Apple ][ or an Apple ][+ and by flipping the
switch on the back (which conveniently sticks through the hole on the back)
you can switch between the motherboard ROMs and the ROMs on the card.
The ROMs map into memory from $D000 to $FFFF so the six labeled chips (D0 to
F8) are another set of ROMs for the card.  The two chips with round windows
are EPROMs that may have been burned for some custom use.

I had one of these cards for my Apple ][+ back in 1980.  It had the Integer
BASIC, Programmer's Aid, and old monitor ROMs on it.  It would work in slot
4 (and maybe other slots) but with some limitations.

Mine wouldn't work in my Apple IIgs ROM 01.

Charlie