Hi,
I am trying to resurrect a dead Apple2 clone for a friend.
This machine is called "Orange Peel", and is packaged as a
small rectangular box with three slots accessable on one
end by sliding back the top, and a separate keyboard.
I believe the machine is running, at least it clears video
memory to zero (familier '_at_' pattern) on powerup, but goes
no further - the ROM/RAM configuration seems odd:
The main board contains 8 4564 DRAM's along with video
and I/O circuitry etc.
The CPU lives on a separate board which is suspended above
the mainboard on long, hard-to-insert pins.
The CPU board has 7 sockets. At one end is a single 2716
EPROM chip labled "New boot", near the other end of the
line is a label on the board which reads "2kb/2716" - this
suggests that the whole line should be ROM's (which would
be consistant with other apples), however the remaining
sockets contain 5517 CMOS RAM's !!! - clearly there is no
other code on this board.
Inside the "New Boot" ROM, the only strings I can see are:
FBPASIC OR INTBASIC FILE REQUIRED
INSERT APPLICATION DISC AND PRESS ESC
This suggests that it loads basic from disk and would not
have it in ROM.
So - I have a bit of a paradox : the "2kb/2716" label suggests
ROM's, and the 64k of RAM on the mainboard also indicates that
all the RAM is on the lower board, however the ROM strings
suggest that this may be the only ROM.
Perhaps it loads code from the disk into "Pseudo-ROM" 5517 bank?
(If so, anyone got the disk code)?
The fact that several of the riser pins were not inserted and
bent under the CPU board indicates that someone with low skills
"worked" on this system at one point. The fact that the attached
power cord was cut off indicates that it was given up on ... so
I cannot assume that it is configured correctly.
Is anyone familier with this system? Can anyone tell me if the
CPU board accepts RAM or if it should be ROM? If so, does anyone
have the proper code? If it loads the RAM's from disk, does anyone
have the disk?
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
Received on Sat Jul 17 2004 - 05:55:01 BST