HP Laserjet ..again....

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat Sep 18 23:44:43 2004

>
> 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
Received on Sat Sep 18 2004 - 23:44:43 BST