3 Mar
2002
3 Mar
'02
2:32 p.m.
I've got an add-on memory board for the Apple ///, but that certainly doesn't
count where the IIe is concerned. That one used one row of normal 4116's and
two rows of the wierd 18-pin parts with two 4116 dice on the same substrate,
bearing an Apple logo, BTW. The one I've got, is modified in terms of the
connectors, as I used it in another application, way back when, and the
connectors didn't suit me. It does count as another Apple memory board,
though.
Could someone address that business with the 80-column aspect? I've had
several of these around and never yet had one that didn't have the key that
switched from 40 to 80-column mode. Was there an earlier version that
required this as an add-on?
Dick
----- Original Message -----
From: "Sellam Ismail" <foo(a)siconic.com>
To: "Classic computing mailing list" <classiccmp(a)classiccmp.org>
Sent: Sunday, March 03, 2002 12:27 PM
Subject: Re: Apple IIe memory board
On Sun, 3 Mar 2002, Gary Hildebrand wrote:
Festival
Trying to figure out what this one is:
I think it is an Apple built memory board, has two rows of ram chips, 32
total, PLCC custom chip and a 24 pin (rom?) chip at the bafk end of the
board. Number silk screened is 670-0024-A
Are you sure it's for the //e? The only memory boards that I know Apple
made were for the //gs (if you don't count the 16K "Language Card" and the
expanded 80 column text card).
I'm wondeing if I can just plug and play, or
if there is some sort of
software driver to access this memory? any web pages on it???
It's most likely plug and play, or else the drivers are built in to ProDOS
or GS/OS to access it. Or the "drivers" are on the firmware.
I have a 1 megabyte AE Ramfactor in my //e that can be programmed in a
very simple way. The memory is basically accessed serially through a
single memory location (or port if you will). There are three registers
where you program the address location you want to access, and then you
read the port to read the byte at that location or write to the port to
write a byte to that location. In either case, the address register is
automatically incremented. A snap to program.
I was able to record 5 minutes of reasonable quality (for the Apple ][ :)
digitized sound into it. I was able to get the whole of Led Zeppelin's
"The Song Remains The Same" recorded on it :)
Sellam Ismail Vintage Computer
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