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TMS9995 ON RC2014
CHRIS SWAN
@CPSWAN
RETRO ME
ZX81, Dragon 32,
Plus/4, C64
Amiga 500, PPC640
Amiga 1200
PC, PC, PC, PC…
https://about.me/cpswan
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
PROJECT INSPIRATION
RC2014
https://www.youtube.com/watch?v=wVUlORo0-Ak
WE ALL BUILD ON THE SHOULDERS OF GIANTS
http://www.searle.wales/
GRANT HAS BASIC AND CP/M FIRMWARE
WHAT DO YOU DO WITH YOUR RC2014 AFTER
CP/M?
1980S CHIP STASH
TMS9995 AND FRIENDS
LIEBHERR 814A1001 PLC
TMS9995 ORIGINS
TMS9900 (1976)
https://commons.wikimedia.org/wiki/File:KL_TI_TMS9900_Black_Background.jpg CC ASA 3.0 by Konstantin Lanzet
TMS9900 PINOUT
TI-990 MINI COMPUTER (1973)
https://commons.wikimedia.org/wiki/File:Ti990.jpg Public Domain by Davepitts
TI-99/4 (1979)
https://commons.wikimedia.org/wiki/File:TI-99-4_homecomputer_(adjusted_version).jpg CC ASA 4.0 by Tocchet22
TI-99/4A (1981)
https://commons.wikimedia.org/wiki/File:TI99-IMG_7132.jpg CC ASA 2.0 by Rama & Musée Bolo
TMS9995 (1982)
TI99/2 (1983)
https://99er.net/992.html Photo by Bryan Roppolo
TI99/8 (1983)
https://www.ninerpedia.org/wiki/File:99_8.jpg
TOMY TUTOR (1982)
https://commons.wikimedia.org/wiki/File:Tomy-Tutor-wControllers.jpg Public Domain by Evan-Amos
POWERTRAN
CORTEX
A DESIGN TO WORK FROM
STUART CONNER – THE GRANT SEARLE OF TMS 99XX
http://www.stuartconner.me.uk/tms9995_breadboard/tms9995_breadboard.htm
FIRMWARE
CIRCUIT DIAGRAM 1 – CPU, RAM, ROM
SOME FAMILIAR OLD FRIENDS – 62256 & 27256
AND SOME SIMILAR CHIP SELECT LOGIC
SERIAL PORT IS A BIT DIFFERENT
BUT I DON’T ACTUALLY NEED RS232 LEVELS
PUTTING IT TOGETHER
MAPPING ARCHITECTURES – FIRST THOUGHTS
Z80 TMS9995
MREQ MEMEN
RD DBIN
WR WE
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
CLOCK CHECK
ADDRESS BUS
COMPLETED FRONT
COMPLETED BACK
HELLO WORLD
HELLO WORLD
HACKING THE RC2014 ROM MODULE
BASIC
FORTH
FINISHING TOUCHES
ARE 16BITS BETTER?
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
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
TMS99XX (KIND OF) LIVES ON IN MSP430 MCUS
WHAT ELSE WOULD YOU LIKE TO KNOW?

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