19 May
2006
19 May
'06
1:01 p.m.
On 5/19/2006 at 7:58 PM Jules Richardson wrote:
Hmm, always knew they were 16Kx1's, didn't
think they were 3-rail though -
I'll have to check what my board has when I get
back to the UK.
They were 4116's (I've used enough of 'em). Pin 1 = VBB = -5, Pin 8 = VDD
= +12, Pin 9 = VSS = Gnd, Pin 16 = VCC = 5.
There was a way to upgrade a 64K PC mobo with suitable cuts and patches
with 4164's. There was a 5v only 16K DRAM (4516), but it' wasn't terribly
common, and, while similar to the 4116, the pinout wasn't 100% compatible
(Pin 1 was given over to REFRESH*). The 4164 kept the Pin 1 = REFRESH*
idea, and gave pin 9 over to A7, so upgrading wasn't terrible.
The 150 ma output of the -5 v rail on the PC PSU was more than enough to
supply the bias to a whole bunch of DRAM, as current consumption runs only
a couple hundred microamps per chip.
Cheers,
Chuck