So looking at this, I am thinking that the CPU instruction set is based upon the Motorola 6800. If this is true, there should be assembler/editor programs. Hitachi may have licensed this and produced their own chips.
Here is my reasoning for thinking this, please sanity check this out:
From the HD6301V1P datasheet, go to scanned page 63 (23 in your pdf reader) and look at table 8 where the opcodes are listed.
Then open this link for the Motorola instruction set
I do a quick comparison of the accumulator A ADD instruction (ADDA) and it appears to me that they have the same hex designation in all the five addressing modes. Can someone else independently confirm?
Update: Came across this wikispace on the 6800 and it also lists a Hitachi 6301 controller version. I think Hitachi licensed the 6800 architecture and adapted it for industrial and hardened environments. They also added 6 extra instructions including a sleep (slp).
Edited by MR_Loyale, 31 December 2016 - 05:56 AM.