View source for 9900

'''16-bit Microprocessor'''

=Family table=
{| border="1" cellpadding="4" cellspacing="0"
! Model 
! Description
! Package
|-
| TI990/9  ||   Early multi-chip CPU for minicomputer systems, 1974 || 
|-
| TI990/10 ||   Multi-chip implementation for minicomputer systems, 1975 || 
|-
| TI990/12 || Multi-chip implementation, faster than 990/10 || 
|-
| TMS9900  || Single chip implementation, 1976, used in the TI-99/4(A) computer || [[:Category:DIP64-750mil|DIP64-750mil]]
|-
| TMS9940  ||   Microcontroller with 2KB ROM, 128B RAM, decrementer, CRU bus, 1979 || 
|-
| TMS9980<br>TMS9981  ||   8-bit databus versions of TMS9900 || [[:Category:DIP40-600mil|DIP40-600mil]]
|-
| TMS9985  || TMS9940 with 8KB ROM, 256B RAM, and an 8-bit external bus, c. 1978 (never released) || 
|-
| TMS9989  || Improved 9980, used in military hardware || [[:Category:DIP40-600mil|DIP40-600mil]]
|-
| TMS9995  || Improved TMS9985-like, no ROM. Used in the TI-99/2 & TI-99/8 prototypes, the [[Tomy Tutor]] and the Geneve computer || [[:Category:DIP40-600mil|DIP40-600mil]]
|-
| TMS99105 || Baseline member of the TMS99000 microprocessor family || 
|- 
| TMS99110 || TMS99000 family microprocessor with floating point instructions pre-programmed into the on-chip Macrostore ROM memory || 
|-
| TMS99120 || TMS99000 family microprocessor with run-time support routines for the PASCAL high-level language pre-programmed into<br>the on-chip Macrostore ROM memory (microprocessor was announced but may never have been commercially produced) || 
|}

=Pinout=
<pre>
          TMS9900
       SDIP64-750mil
         +---\/---+
     VBB | 1    64| *HOLD
     Vcc | 2    63| *MEMEN
    WAIT | 3    62| READY
   *LOAD | 4    61| *WE
   HOLDA | 5    60| CRUCLK
  *RESET | 6    59| Vcc
     IAQ | 7    58| NC
  PHASE1 | 8    57| NC
  PHASE2 | 9    56| D15
     A14 |10    55| D14
     A13 |11    54| D13
     A12 |12    53| D12
     A11 |13    52| D11
     A10 |14    51| D10
      A9 |15    50| D9
      A8 |16    49| D8
      A7 |17    48| D7
      A6 |18    47| D6
      A5 |19    46| D5
      A4 |20    45| D4
      A3 |21    44| D3
      A2 |22    43| D2
      A1 |23    42| D1
      A0 |24    41| D0
  PHASE4 |25    40| Vss
     Vss |26    39| NC
     Vdd |27    38| NC
  PHASE3 |28    37| NC
    DBIN |29    36| IC0
  CRUOUT |30    35| IC1
   CRUIN |31    34| IC2
 *INTREQ |32    33| IC3
         +--------+

            TMS9980
          DIP40-600mil
           +---\/---+
     *HOLD | 1    40| *MEMEN
     HOLDA | 2    39| READY
       IAQ | 3    38| *WE
A13/CRUOUT | 4    37| CRUCLK
       A12 | 5    36| Vdd
       A11 | 6    35| Vss
       A10 | 7    34| CKIN
        A9 | 8    33| D7
        A8 | 9    32| D6
        A7 |10    31| D5
        A6 |11    30| D4
        A5 |12    29| D3
        A4 |13    28| D2
        A3 |14    27| D1
        A2 |15    26| D0
        A1 |16    25| INT0
        A0 |17    24| INT1
      DBIN |18    23| INT2
     CRUIN |19    22| Ø3
       Vcc |20    21| Vbb
           +--------+
</pre>

=Frequency=
'''9900'''<br>
Set reader to FREQ, put black probe to GND, red probe to 8,9,25,28,60 to measure CPU clock<br>

'''9980'''<br>
Set reader to FREQ, put black probe to GND, red probe to 22,34,37 to measure CPU clock<br>

=External links=
[https://en.wikipedia.org/wiki/Texas_Instruments_TMS9900 TMS9900 page on Wikipedia]<br>
[https://www.cpu-world.com/CPUs/TMS9900/index.html 9900 page on CPU-World]<br>
[https://www.cpu-world.com/CPUs/TMS9980/index.html 9980 page on CPU-World]<br>
[https://www.cpu-world.com/CPUs/TMS9995/index.html 9995 page on CPU-World]

=Files=
<gallery widths="150px">
File:9980.pdf|TMS9980 Datasheet
</gallery>

[[Category:CPU]]
[[Category:DIP40-600mil]]
[[Category:DIP64-750mil]]