18 Sep
2004
18 Sep
'04
4:44 p.m.
As I stated earlier, I have cannibalized three HP laserjet series II
printers. In looking over the parts recovered I find that I have three
(3) totally different memory boards.
The first is populated with small chips on BOTH sides of the board with
a total of 128 soldered in chips that appear from their part numbers to
be 256K memory chips, That is the number 256 appears within the part
number. Now I don't know how wide the buss is but I am assuming 8 bits
because of its age. If so this board is a 4 Megabyte memory board.
The bus width doesn't matter in determining the memory size. If you had
16 1 megabit memory chips arranged as 2 megs * 8 bits, that a 2 megabyte
board. If you had them arrangeded as 1 meg * 16 bits, that's still a 2
megabyte board.
The Series 2 formatters use a 68000 processor (the 64 pin chip on the
formatter board) and thus have a 16 bit wide databus.
-tony