There are lots of 4164-compatible chips, many with different part numbers. Note
that a Micron MT4264 is a 16 pin 64K x 1 chip, whereas a Matsushita MN4264 is
an 18-pin 16K x 4 chip.
Here's a list of 4164-type chips; ironically the MT4264 isn't on it ;-)
http://www.minuszerodegrees.net/memory/4164.htm
And here's an old 4164/4264 discussion on VCfed:
http://www.vcfed.org/forum/archive/index.php/t-20078.html
m
----- Original Message -----
From: Josh Bensadon
To: torontocbm@xxxxxxxxxxxxx
Sent: Friday, September 29, 2017 10:15 AM
Subject: [torontocbm] Re: 4164 vs 4264
Hi Guys,
Just a follow up, for anyone curious.
Stewart and I tried placing a mixture of 4164 and 4264 chips into the Apple
IIe and they both worked equally well.
What ever differences there are in these chips is buried in the data sheets,
but for this particular machine they don't matter.
Furthermore, the RAM TEST function works on the memory on the 80column card
first.
That is to say, if you have a bad chip on the mother board AND on the 80
column card, only the chip in the 80 column card will be reported.
As you may already know, it's always best to remove all cards and start the
testing on the base system, then add cards and test as you go along.
Cheers,
Josh
------------------------------------------------------------------------------
From: torontocbm-bounce@xxxxxxxxxxxxx <torontocbm-bounce@xxxxxxxxxxxxx> on
behalf of Stewart C. Russell <scruss@xxxxxxxxx>
Sent: Thursday, September 28, 2017 8:32 AM
To: torontocbm@xxxxxxxxxxxxx
Subject: [torontocbm] Re: computers and Amiga for sale:
On 2017-09-25 01:43 PM, Josh Bensadon wrote:
>
> I'm not sure, but I'll look to see if I have a 4264... strange sounding
> chip number. Does it go by any other number?
>
> 4464's are 64K by 4 bits, so is the 4264 a 64K by 2 bits?
Hi Josh - even though the chips are Apple-labelled Micron Technologies
4264s, it seems that 4164s as used in the C64 work just fine. My IIe is
evidence of this: chip 1 of 8 is a TMS 4164-15NL, and it's not the bad
one: https://flic.kr/p/YTCgBN ;
my apple iie ram
a mix of Apple-branded Micron 4264s and one TMS-4164-15NL. The 4th chip
from the left is bad - boo
I'm pretty sure that A-1 had a shedload of Czech Tesla 4164s the last
time I was in, but I missed 'em by 15 minutes in Tuesday night's traffic.
Can't see any real difference from the 4164 spec in the 4264 data sheet:
https://4donline.ihs.com/images/VipMasterIC/IC/MICT/MICTS03381/MICTS03381-1.pdf
Both are page mode DRAMs of moderate speed.
cheers,
Stewart
