Re: what apple is this? (more photos)

[dempson@actrix.gen.nz (David Empson)]

Michael J. Mahon <mjmahon@aol.com> wrote:

> Guillaume Tello wrote:
> >     Here it is:
> > http://pagesperso-orange.fr/gtello/whatapple8.jpg
> > 
> >     But why are there four Roms places?
> >     One is clearly labelled F0-F8 Apple (Prodos)
> >     And I think the other one is BASIC 8K, but I might be wrong.
> 
> I'd guess that the card is set up to accept ROMs of different
> sizes, so there are more places for ROMs.
> 
> In the photo, one ROM is 4KB, replacing the F0 and F8 ROMs, and
> one ROM is 8KB, replacing the four (D0, D8, E0, E8) Applesoft ROMs.

Minor detail: Applesoft is five ROMs: D0 through F0. The F8 ROM is the
monitor and associated firmware such as lo-res graphics, text routines,
etc.

With Integer BASIC, the language itself occupies E0, E8 and part of F0,
with the rest of F0 taken up with utilities such as the mini-assembler.
D0 was the optional "Programmer's Aid #1". Apple didn't supply a D8 ROM
but there must be something there in the INTBASIC file from DOS. I think
there was a third-party ROM which was occasionally used in that
position, but I didn't start using the Apple ][ until the ][+ was well
established.

As to the ROM saying "F0-F8 Apple (Prodos)": that doesn't make much
sense, since ProDOS doesn't live in the ROM. It operates out of the
language card RAM (in the D0-FF pages, also using part of the second
D0-DF bank). Whoever wrote the label was probably confused.

-- 
David Empson
dempson@actrix.gen.nz