Re: Question about Apple ][ ROM chips!

[david@uow.edu.au (David Wilson)]

sark314@hotmail.com (Charles Forbin) writes:
>Basically, I'm trying to verify the authenticity of these machines.  I
>know that, on an original ][, one could access Applesoft from the
>Language or Firmware Cards, or load it from disk or cassette, but was
>it possible to physically replace the motherboard Integer BASIC ROM
>chips with Applesoft chips?  I'm also wondering what the chance is
>that either motherboard is in fact a ][+ motherboard.  I know the ][+
>was released in 1979, but does that mean its motherboards would only
>have copyright dates from '79 onward?

The only difference between an Apple ][ and an Apple ][+ is the ROMs.

If it has Integer BASIC and the old Monitor it is a ][.
If it has Applesoft BASIC and the Autostart monitor it is a ][+.
Look for the Microsoft & Apple copyrights on the Applesoft ROMs.

The motherboard came in a number of revisions:

Non-RFI - p/n 820-0001-XX (found under 6502 socket on early revs, near F1 later)

00	no aux video pin, 3x RAM size selector blocks
01-06	aux video pin, 3x RAM size selector blocks
07	aux video pin, no RAM size selector blocks

RFI - p/n 820-0044-XX (near F1)

A-D	just minor changes to improve RFI
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia