17 Sep
2015
17 Sep
'15
8:55 p.m.
On 09/17/2015 08:40 PM, ben wrote:
On 9/17/2015 6:50 PM, Jecel Assumpcao Jr. wrote:
The 370/145 had microcode in static RAM, in a region of main
storage, the first 64 K was a faster bank of SRAM, if I
remember correctly.
The wall between microcode and regular main storage was
movable, and selected by the microcode.
I think the later X86 machines have a tiny block of patch
microcode that is available to the OS to put special
routines into.
Jon
This conclusion should have been obvious to anyone
thinking about
general purpose computers implemented with microcode in ROM.
Are there any computers that do let you put microcode into
RAM now-days.
You have a lot of byte code virtual machines out there.