microcoding a PC into a PDP-11 (was: RE: Classic Computers vs. Classic Computing)

From: Tom Owad <owad_at_applefritter.com>
Date: Mon Sep 17 15:37:48 2001

>> >Cool idea -- flash on a DIMM. Has anyone ever heard of such a beast?
>> The Apple Set Top box uses flash SIMM/DIMMs for it's boot
>> code. At least the one I have does. It's a 68pin SIMM with 8 Intel
>> E28F020 flash memory chips (256k x 8).

I think that's just in the earlier prototypes. What you have is probably
like this:


Later prototypes used a Mask ROM:


>By Apple set top box, do you mean the Mac that was black, and had a TV? Or
>do you mean that device that was never released, is Apple branded, and
>plugged into a TV? Or another machine all together? Can you elaborate?

He means 'a never-released device that plugged into a TV', also known as
the "Interactive Television Box". It's based on the LC 475. Info at

I'd be very curious if anybody's managed to get one of these to boot.


Received on Mon Sep 17 2001 - 15:37:48 BST

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