Piedinature - Pinouts
TI-99/4A Side Port

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Available on TI-99/4A computers. On the right side

  2                             44 +----------------------------------+ | ================================ | +----------------------------------+   1                             43
PinNameDirDescription
1VCC-+5 Volts power supply
2SBEOUTLow if addr in >9000-94xx (sound port)
3RESET*OUTSystem reset (active low)
4EXTINT*INExternal interrupt (active low)
5A5OUTAddress bus, bit 5
6A10OUT-
7A4OUT-
8A11OUT-
9DBINOUTActive high = read memory
10A3OUT-
11A12OUT-
12READYINActive high = memory is ready
13LOAD*INUnmaskable interrupt (=> BLWP @>FFFC)
14A8OUT-
15A13OUT-
16A14OUT-
17A7OUT-
18A9OUT-
19A15OUTAddress bus, lsb. Also CRU output bit.
20A2OUT-
21GND-Ground
22CRUCLK*OUTInversion of TMS9900 CRUCLOCK pin
23GND-Ground
24PHI3*OUTInversion of phase 3 clock
25GND-Ground
26WE*OUTWrite Enable (derived from TMS9900 WE* pin)
27GND-Ground
28MBE*OUTActive low if addr in >4000-5FFF (card ROMs)
29A6OUT-
30A1OUT-
31A0OUTAddress bus, bit 0 (most significant)
32MEMEN*OUTMemory access enable (active low)
33CRUININCRU input bit to TMS9900
34D7IN/OUTData bus, bit 7 (least significant)
35D4IN/OUT-
36D6IN/OUT-
37D0IN/OUTData bus, bit 0 (most significant)
38D5IN/OUT-
39D2IN/OUT-
40D1IN/OUT-
41IAQINInterrupt acknowledged by TMS9900
42D3IN/OUT-
43VDD--5 Volts power supply
44AUDIOININTo sound generator AUDIO IN pin



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