Modifying microcode

Kyle Owen kylevowen at
Wed May 30 10:02:35 CDT 2018

On Wed, May 30, 2018 at 9:34 AM, Camiel Vanderhoeven <
camiel.vanderhoeven at> wrote:

> The microcode for the MicroVAX 2 (for which the MICRO2 assembler was used)
> and the CVAX (which is the CPU in your 3800) is implemented as a mask ROM
> on the CPU chip itself. No way to change it, and no way you can use MICRO2
> to assemble the microcode for the CVAX.

Gotcha. Which small VAXes had external ROM/PALs for microcode store?



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