Relatively easy to dump roms (no singlechip SH1, H8, HD6301, ...)
List is not complete.
Not including rare TM ones.

chesscomputers:

Chess King:
- Philidor
Conchess:
- Plymate (original)
- Princhess
CXG:
- Chess 3000
- Sphinx 40/50 Plus
- Sphinx Galaxy
Fidelity:
- CC7 1st version CN19064N
- EAG V1
- EAG V6
- EAG V8
- Gambit Voice
- Little Chesster
H+G Mephisto:
- Monte Carlo IV original (not LE)
- Portorose 16bit 1.03/1.04
- Roma 2
- Montreal 68000
Milton Bradley:
- Milton
Novag:
- Robot Adversary
Tasc:
- R40
VEB Erfurt:
- Chessmaster (2-rom set) missing one rom dump
- SC-1

modules:

ACI Great Game Machine/Modular Game System:
- Gruenfeld Edition - Master Chess Openings
- Monitor Edition - Master Kriegspiel
- Borchek Edition - Master Checkers
- Odin Edition - Master Reversi
- Las Vegas 21
ARB:
- GMS 3
- GMS 3.5
Conchess:
- Victoria book module
Fidelity generic:
- encyclopedia
- CG64: 64 Greatest Games
- TDF: Tarrasch Defense
Fidelity SC6:
- BO6: Book Openings I
- CG6: Greatest Chess Games 1
Fidelity Mini Sensory:
- CGG: Challenger Greatest Games
Intellect-02:
- Kalah
- any others?
Mephisto Mondial:
- MM 1000
SciSys Sensor Chess:
- Hyper Modern Super Strong