9 Jun
2004
9 Jun
'04
3:19 p.m.
Ethan Dicks wrote:
On Wed, Jun 09, 2004 at 12:28:27PM -0500, Doc Shipley
wrote:
I figure you've read the thread by now, but here's the recap:
The Cheetah board is 256Kx1 16-pin DIPs. The A2091 needs 20-pin
256Kx4 chips.
I looked in my junk box and found a couple of PS/2 graphics boards
with the ROMs missing and one burnt up. Each had 8 TI TMS44C256-12N
DIPs, which are now running nicely on the A2091. As soon as I finish
cooking and eating dinner, I'm gonna see if it juked up the abysmal disk
I/O a little.
The whole list ganged up to teach me some memory basics. :)
Doc
So, more relevant to me, is the board itself
worth anything outside
the DRAMs? I have a friend doing a 68000 SBC project who could use
some, and I think some of the rest would look fabulous on my Amiga
2000's A2091 board.
So those DRAMS are 44256s? That's what the A2091 takes, 256Kx4.
Speed is not a problem - 150ns is fast enough, but ISTR 120ns was
more commonly available by the time 1Mbit chips were ordinary, and
I think they were available as fast as 80ns in DIP packages.
-ethan