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Looking for TMS2670 Datasheet or Pinout (Series TMS2600** MCU 4 bit 256x4b Ram 4kx8b Rom 40 pin DIP circa 1970s/80s)

Bix Dobs
Prodigy 10 points

Attempting to restore an 80's vintage appliance which incorporates a 4-bit TI TMS2670 processor ... the processor appears to be fully functional but knowing the MCU pinout may further help with diagnosing the appliance's failed operations ... there are online mentions of this MCU going back to the '70s... this particular device was used in a mid 80's appliance ... it is mentioned under Series TMS1000 in the 1983/84 IC Master but sadly provides no pinout ... appears TI has been able to provide archived documents from this era to other forum members ... hoping this MCU datasheet can be found too.

Thanks in advanced

The following common signals are connected to this MCU:

Pins 38 & 39 appear to be the master Osc (500kHz Xtal)

Pins 2 & 40 are wired to Gnd

Pins 18 & 36 are wired to +9V

TMS 2670 metrics (from 1983 IC Master)

Supply Voltage 9V

ROM 4k (x 8b bytes)

DATA Ram 256 x 4b

K' & J' I/Ps 8

R Bi-directional 4 (I/O)

R Addressable O/Ps 14

O Parallel Latched O/Ps 8

IRQ I/P 1

Timer/ECI Yes/No

8b A/D 4

Zero Cross Detection Yes

As all of these features add up to more than 40 pins, expecting that some of these features are soft configurable

  • 0
    TI__Guru 71526 points

    Hello Bix,

      An initial review of old devices, I am not able to locate any information about the TMS2670.  I am pursuing other sources, it may take a few days.  I will update this E2E by Friday this week.

    At your service,

    ~Leonard 

  • 0 in reply to LeonardEllis
    TI__Guru 71526 points

    Hello Bix,

      The TMS2670 was apparently a custom processor with code for this appliance, based on the TMS1000.  Unfortunately, no documentation has been archived.  However, there is a wikipedia page for the TMS1000 and it contains a reference to a 1975 Microcomputers Manual, although we cannot verify the information presented, 

      As a final thought, I'm wondering if you can contact the appliance manufacturer and ask for any documentation they might have.  Possibly a schematic for the pcb where this MCU is used.  

    Regards, 

    ~Leonard