18 Sep
2015
18 Sep
'15
11:39 a.m.
On 9/18/2015 7:33 AM, tony duell wrote:
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.
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. -tony
Ben.