30 Dec
2008
30 Dec
'08
11:08 a.m.
Oliver Lehmann wrote:
My Zilog S8000 Winchester Controller board carries 2 ceramic DIL16
packaged chips labeled (beside a logo) just with the two lines of text.
The chip looks like this (tried to ASCII-art the logo in front of the
text)
+----------------------------------------+
| +-------+ |
| |----- | |
\ | > ----| 6306-1J |
/ |----- | 8147 |
| | > ----| |
| +-------+ |
+----------------------------------------+
I guess the 2nd line means:
81 == 1981
47 == calendar week 47
So I wonder what 6306-1J stands for? I've not analyzed the circuit to see
if it is a PROM or something like that. It is put in a socket so I guess
it must be something (onetime?) programmable...
Your guess sounds like a good one.
IC Master 1982 lists a 6306-1 as a 512*4 PROM from MMI.
60nS, TTL, 5V, 16 pins, tri-state outputs.
MMI is Monolithic Memories Inc.
It's also listed with alternate sources of:
AM27S13 AMD
AM29770
AM29771
93446 Fairchild
HM7621 Harris
IM5624 Intersil
DM74S571 National
N82S131 Signetics
SN74S370 TI