Self modifying code, lambda calculus - Re: ENIAC programming

ben bfranchuk at
Fri Sep 18 13:39:47 CDT 2015

On 9/18/2015 7:33 AM, tony duell wrote:
>>> Are there any computers that do let you put microcode into RAM
>>> now-days.
>> "Now-days"?  There are some that do that, some of which are still in
>> operational shape.  Some VAXen, in particular, have something called
>> "writable control store", which is essentially microcode RAM.
> As far as I know, the VAX11/730 (There is one next to me waiting for me to have time
> to restore it) has the microcode entirely in RAM. Classic PERQs (3 in the next room) have
> their microcode entirely in RAM too (in that case, there is a microcode boot ROM to load
> the microcode from disk, but it is switched out after the microcode is loaded).

VAX and PREQ's are not something I go to Wallmart and pick up for 
$147.95 with some bread and T-shirts.

> -tony

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