Jon Elson via cctalk wrote:
> On 3/9/25 04:14, Holm Tiffe via cctalk wrote:
> > ben via cctalk wrote:
> >
> > > On 2025-03-08 8:09 a.m., emanuel stiebler via cctalk wrote:
> > > > On 2025-03-07 15:36, 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.
>
> In about 1982 I built a 32-bit bit slice machine using 8 X 2903 and a 2910
> sequencer. I had it set up with 1K of 96-bit wide control store, and it ran
> 2-address operations at 8 MHz and 3-address at 6 MHz. See :
> http://pico-systems.com/stories/1982.html for some text and photos.
:-) Yes Jon, I've already knew this story.
This coming from gathering information about the AMD Bitslices from
around the world...
>
> Unfortunately, I badly underestimated the effort to get a complete system
> based on this working and abandoned the project. I did have a console
> program that ran on CP/M that could load microcode, load and examine
> registers, and start the micromachine. I then had to build a memory
> interface and system bus controller, and add a few small details for
> instruction dispatch and instruction fetching optimization. THEN** I had to
> figure out some way to get a Pascal compiler for the 360 architecture and
> create an OS and utilities. A big job!
>
> Jon
>
Ok, this is a full fledged mainframe CPU.. not really what I want todo first.
That stuff tends to "explode" in sight of parts, needed power and space,
I know that.
On the other side I saw different controllers for PDP11/VAX stuff that
used the 290x to control "hardware". That are microprogrammed computers
w/o any system bus and macro-instructions. Even the controller of an DEC
RX01 RX02 is build around two AM2901.
(I'm a former east german from "behind the iron curtain" and I own something
like a russian PDP11/23 clone, an "Elektronika E60" that was used from a
east german company "Carl Zeiss Jena" which had an dependance in my
hometown to steer an X-Ray Spectrometer. The russian dual 8" floppy
drive has also 2 pcs. of K1084BC1 .. AM2901)
My first idea is to build a digital clock with a single 2901 -
only micro programmed. Ok, it's total nonsense.. but all what we do here
is playing with some outdated stuff, so where this clock..
I hope that I could do this with an single 2901 RALU, that means I have
to calculate twice for 8 Bits, like the ALU in a Z80...
Later I could try to build something with the 49C402, AM29116 or WS59032
to save PCB space.. All that stuff is already in my stash of parts,
besides many 2901,2903,2909,11,10 etc...
Maybe I'm trying to get that PCB with the four AM29203 and AM2910 from
GE to life first.
Regards,
Holm
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