9 Mar
2025
9 Mar
'25
10:24 a.m.
ben via cctalk wrote:
I have a bunch of collected stuff, including some Altera CPLD's
and Atmel ATF's too..
From time to time I've already buying stuff from poland, mut most of the
things seems to go over allegro and not ebay.
On 2025-03-07 1:36 p.m., Holm Tiffe via cctalk wrote:
Oh no...
Hi all,
I'm dreaming to build sometimes my own Bit Slice CPU (when I have spare time)
and I have collected several IC's in the last years for this purpose.
Today a small antistatic bag with 4x IDT49C402BG84 and two IDT 49C410J
fell in my hands while I was sorting some stuff.
You really want N3002N 2 bit, bit slices, 9 for 18 BITS, 10 for 20 BITS. I know what they are and what they could do, they
are able to help me
to build a Bit Slice CPU w/o very large PCB's connecting hordes of 2901 etc.
Besides of that they are CMOS and should draw much less power.
But I have a problem with the 49C402: All datasheets that I could find
until now, don't have the pinput auf that nice PGA84 package, there are
DIP68, LCC/PLCC68 G68 or PG68 and QE68 "Cerquad" pinouts listet in every
datasheet, but I have 4 chips in a PGA84 housing...
if you must go to the dark side, 16 or 32 bit design pick up
a 16 bit alu in a PLCC 68 package. I have been doing a lot
of work with CPLD's ATF1508 and (the chips are easy to program)
are easy remove/insert into the sockets.
https://store.rosco-m68k.com/products/little-atf-programmer
I had some 16 bit slices, but had problems with the 64 pin dip
package for a 20 bit cpu. I later tried a regular 2901's.
I also needed to use 22v10's all over the place.
The biggest problem was design had bus timing issues,
it worked for few minutes and then quit.
I've tought about a first working example, just to get involved with the
stuff.. maybe an digital clock just using an single AM2901 and an
AM2910? ..just to keep the count of chips low..?
This ebay page has pictures:
https://www.ebay.com/p/10020043211
I don't have anything todo with the seller.
Poland seems to have alot of odd stuff on ebay
like N3002's. Hint, Hint :)
While waiting for data, now is good time to think about software.
Ben.
At first any Macroassembler should do the job for coding the bits in the
control store, but even AMDASM and friends are laying around somwhere on
my disks. I thin the time to talk about "real software" is when the cpu
sucessfully adds it's first bytes..
[..]
PS.
I have older pcbs mostly working, of a 18 bit cpu ready to go to a good
home.
PPS. Still writing software, so the hardware is not ready to ship. You do
want a working bootstrap program!
Nice.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583
info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741