Acorn ASIC technology

[Theo Markettos]

Bit of a niche question this, but anyway...

Does anyone know what feature size Acorn fabbed their ASICs with, and with
whom?

For example, googling suggests:

VIDC1 2.4um VLSI Technology
ARM2 2.0um VLSI
ARM3 1.6um VLSI
ARM610 1.2um GEC Plessey Semiconductor (GPS)
ARM710 0.8um/0.6um ?
ARM7500 0.6um ?
ARM7500FE ? Cirrus Logic
SA110 0.35um DEC

Most of these are easily available from press releases, journal publications
(ISSCC) etc. But what I was wondering about was the ASICs that went into
specific products. For example, IOEB (in A5000), the A4 LCD ASIC, IOMD (in
Risc PC), VIDC20 (RPC). Were they fabbed by the same people as the 'proper'
processors (despite ARM Ltd diverging after ARM3) or some smaller scale
manufacturer?

Thanks
Theo

[Sprow]

On Mar 24, 8:24 pm, Theo Markettos <theom+n...@chiark.greenend.org.uk>
wrote:

On the one with the lid off in front of me
IOMD = GPS (date code 9515)
VIDC20 = VLSI (date code 9508) 1um technology (page 2 of datasheet
DDI 0030E)
ARM7500 = VLSI (date code 9547)

I have a PCMCIA podule somewhere with an Acorn ASIC on it, and there
was one on the PC card too, though I don't have one of those any more,
Sprow.

[xlt...@gmail.com]

Hello.

From the pictures here :
http://acorn.chriswhy.co.uk/Computers/A3010.html
I an tell the ARM250 was by GPS (and the early mezzanine daugher board still by VLSI).
I'm sure other photos of the other computers in the range will help you, Theo.
This web site by Chris is certainly one of (if not THE) best about the Archies, it hardware, expansions etc ...
Cheers,
Xavier.

[Adam H]

I worked at GPS designing the layout of ASICs and writing design software when we made some of the ARM devices. Unfortunately I can't remember which ones fabbed and with which technology - it was all so long ago :(

However, I do have an FPA from ARM - actually from a pre-production test run - sitting in my A5000 :)