Re: Apple II vintage

[shack@onyx.southwind.net (Randy Shackelford)]

John Jackson (John.Jackson@launchpad.unc.edu) wrote:
: In article <jesse-2004951522210001@jesse2.gi.alaska.edu>,
: Jesse P. Atencio <jesse@dino.gi.alaska.edu> wrote:
: >Just for the heck of it...
: >
: >I have an Apple II.  Not a II plus, or IIe here.  It has serial number
: >8050 hand written on the motherboard.  Sticker on the bottom of case lists
: >serial # A2S1-75884.  Also lists models available as:
: >A2S0016 - 16K model
: >A2S0032 - 32K model
: >A2S0048 - 48K model
: >
: >So I guess these are the three configurations available at the time for
: >the Apple II.

Mine is A2S1-30123. It doesn't have the 16-32-48 sticker on the bottom.

: Yes, your assumption is correct.  As you face the keyboard one would see
: to the left of each of the 3 rows of memory a configuration block. By
: setting this block the machine would know which of the 3 amounts of ram it
: had.  Then came the language card containing AppleSoft, the a 16K memory
: card, etc.

In the red book it talks about 4K and 8K systems. I'm pretty sure that those
jumper things set whether a row has 4K or 16K chips in it. My logic board
has plastic blocks that say 16K on them. The machine can figure out on its own
how much memory it has. One time I couldn't get a 48K slave disk to boot on 
mine, only the system master would boot. So I had a look at the page 3 DOS 
vectors and figured out that DOS was loading in the 32K location. I had a bad
chip in the third row and the machine thought it only had 32K. So I found the 
bad chip and replaced it and I suddenly had 48K again.
-- 
Randy Shackelford                                 I was internet
shack@southwind.net                               when internet wasn't cool