ben via cctalk wrote: > On 2025-03-07 1:36 p.m., Holm Tiffe via cctalk wrote: > > 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.
Oh no... > > > 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 have a bunch of collected stuff, including some Altera CPLD's and Atmel ATF's too.. > > 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 :) >From time to time I've already buying stuff from poland, mut most of the things seems to go over allegro and not ebay. > > 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 i...@tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741
