20 Oct
1999
20 Oct
'99
3:30 p.m.
Yes, those parts were OK, except that they are several orders of magnitude
too slow. Volatility is not the issue, since it will be changed frequently,
but it's VITAL that the parts be quick, i.e. 5-7 ns max, on address access
and separate ins and outs would be best. I don't care if I waste 95% of the
RAM, but it should have separate ins and outs, and I have seen VERY few of
those, particularly in the speed i want.
Any suggestions?
Dick
-----Original Message-----
From: Roger Merchberger <zmerch(a)30below.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Wednesday, October 20, 1999 8:13 PM
Subject: Re: outgrowth of : OT: how big would it be?
Rumor has it that Richard Erlacher may have mentioned
these words:
>So, who makes 256-byte RAM devices at TTL speeds these days. There are
all
sorts of FIFOs
of 256 bytes, but I can't find a simple 256-byte RAM any
more. I also need a 32x8-bit sram, fast (preferably address-access time
<<10ns) and preferably in a small package.
Not sure who still *makes* them, but BGMicro and I think Jameco still sells
Moto 6810 & I think 68B10 parts - IIRC 128x8 parts. (No, not Meg, No, not
Kilo, but 128 Bytes... just to clarify ;-)
Also, if you're looking for non-volitile, you could go with one of the
Dallas Semiconductor 12x887 parts - 14 bytes of control registers for the
onboard clock chip, and 114 bytes of general-purpose battery-backed RAM.
BGMicro has some pretty weird stuff... including some really nice kits from
what I recall. www.bgmicro.com; I think they have a catalog online, if not
you can download it as a .pdf...
Hope that helps,
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger --- sysadmin, Iceberg Computers
Recycling is good, right??? Ok, so I'll recycle an old .sig.
If at first you don't succeed, nuclear warhead
disarmament should *not* be your first career choice.