The document discusses the TMS9995 CPU module for the RC2014 computer, including its origins, design inspirations, and comparative performance. It covers key elements such as project inspiration, architecture mapping, and firmware considerations. The talk also addresses the historical context of the TMS9995 within the evolution of computing technology.

1. TMS9995 ON RC2014
CHRIS SWAN
@CPSWAN

2. RETRO ME
ZX81, Dragon 32,
Plus/4, C64
Amiga 500, PPC640
Amiga 1200
PC, PC, PC, PC…
https://about.me/cpswan

3. WHAT TO EXPECT FROM THIS TALK
•Project Inspiration
•TMS9995 origins
•A design to work from
•Putting it together
•Hello World
•Are 16bits better?
https://hackaday.io/project/166036-tms9995-cpu-module-for-rc2014

4. PROJECT INSPIRATION

5. RC2014
https://www.youtube.com/watch?v=wVUlORo0-Ak

6. WE ALL BUILD ON THE SHOULDERS OF GIANTS
http://www.searle.wales/

7. GRANT HAS BASIC AND CP/M FIRMWARE

8. WHAT DO YOU DO WITH YOUR RC2014 AFTER
CP/M?

9. 1980S CHIP STASH

10. TMS9995 AND FRIENDS

11. LIEBHERR 814A1001 PLC

12. TMS9995 ORIGINS

13. TMS9900 (1976)
https://commons.wikimedia.org/wiki/File:KL_TI_TMS9900_Black_Background.jpg CC ASA 3.0 by Konstantin Lanzet

14. TMS9900 PINOUT

15. TI-990 MINI COMPUTER (1973)
https://commons.wikimedia.org/wiki/File:Ti990.jpg Public Domain by Davepitts

16. TI-99/4 (1979)
https://commons.wikimedia.org/wiki/File:TI-99-4_homecomputer_(adjusted_version).jpg CC ASA 4.0 by Tocchet22

17. TI-99/4A (1981)
https://commons.wikimedia.org/wiki/File:TI99-IMG_7132.jpg CC ASA 2.0 by Rama & Musée Bolo

18. TMS9995 (1982)

19. TI99/2 (1983)
https://99er.net/992.html Photo by Bryan Roppolo

20. TI99/8 (1983)
https://www.ninerpedia.org/wiki/File:99_8.jpg

21. TOMY TUTOR (1982)
https://commons.wikimedia.org/wiki/File:Tomy-Tutor-wControllers.jpg Public Domain by Evan-Amos

22. POWERTRAN
CORTEX

23. A DESIGN TO WORK FROM

24. STUART CONNER – THE GRANT SEARLE OF TMS 99XX
http://www.stuartconner.me.uk/tms9995_breadboard/tms9995_breadboard.htm

25. FIRMWARE

26. CIRCUIT DIAGRAM 1 – CPU, RAM, ROM

27. SOME FAMILIAR OLD FRIENDS – 62256 & 27256

28. AND SOME SIMILAR CHIP SELECT LOGIC

29. SERIAL PORT IS A BIT DIFFERENT

30. BUT I DON’T ACTUALLY NEED RS232 LEVELS

31. PUTTING IT TOGETHER

32. MAPPING ARCHITECTURES – FIRST THOUGHTS
Z80 TMS9995
MREQ MEMEN
RD DBIN
WR WE

33. MAPPING ARCHITECTURES
TMS9995 RC2014
A0-A15 A15-A0
Vss GND
Vcc 5v
NC M1
Reset Reset
CLKOUT Clock
NC INT
MEMEN Mreq
WE/CRUCLK Wr
DBIN Rd
NC IORQ
D7-D0 D0-D7
CRUIN USR1

34. CLOCK CHECK

35. ADDRESS BUS

36. COMPLETED FRONT

37. COMPLETED BACK

38. HELLO WORLD

39. HELLO WORLD

40. HACKING THE RC2014 ROM MODULE

41. BASIC

42. FORTH

43. FINISHING TOUCHES

44. ARE 16BITS BETTER?

45. NO!
0
10
20
30
40
50
60
Z80 @ 14.7MHz 6502 @ 4MHz TMS9995 @ 3MHz
BASIC Primes to 199
http://ancientcomputing.blogspot.com/2017/06/a-6502-cpu-for-rc2014-software.html

46. NOT GREAT, NOT TERRIBLE
0
10
20
30
40
50
60
Z80 @ 3.5MHz (ZX Spectrum) 6502 @ 2MHz (BBC Micro) TMS9995 @ 3MHz
BASIC Primes to 199

47. TMS99XX (KIND OF) LIVES ON IN MSP430 MCUS

48. WHAT ELSE WOULD YOU LIKE TO KNOW?