30 May
2018
30 May
'18
9:53 a.m.
Van: Paul Koning via cctalk<mailto:cctalk at classiccmp.org>
Verzonden: woensdag 30 mei 2018 18:49
Aan: Camiel Vanderhoeven<mailto:camiel.vanderhoeven at vmssoftware.com>; General
Discussion: On-Topic and Off-Topic Posts<mailto:cctalk at classiccmp.org>
Onderwerp: Re: Modifying microcode
On May 30, 2018, at 11:11 AM, Camiel Vanderhoeven via
cctalk <cctalk at classiccmp.org> wrote:
Depending on your definition of small, the MicroVAX 1, and the VAX 8000 series (not that
small). In both cases though, the ROM chips are a custom DEC design.
Didn't the 780 get its microcode loaded by the console LSI-11? And the 730 used bit
slice processors (AMD 2901) as I recall, so that had to have its microcode external.
paul
I always thought (?) that the TU58 cassette ?in? the front of the VAX-11/730
contained the microcode. For ease, that cartridge was kept in the drive so
that it is available at boot time. Causing a lot of ?D?shaped rubber rollers ?
Henk, PA8PDP