Распиновка разъема TI-99/4A Card Slot Connector

Распиновка, расположение выводов и внешний вид платы расширения:

TI-99/4A Card Slot

60 PIN UNKNOWN CONNECTOR on the computer

59 Left 1
Front ===================== Rear
60 Right 2

Pin
Name
Dir
Description

1
+8V

+5V 3-T regulator voltage supply (about +8V)

2
+8V

+5V 3-T regulator voltage supply (about +8V)

3
GND

Ground

4
READYA
 
System ready (10K pull-up to +5V)

5
GND

Ground

6
RESET*

System reset (active low)

7
GND

Ground

8
SCLK
nc
System clock (not connected)

9
LCP*
nc
CPU indicator 1=TI99 0=2nd generation (not connected)

10
AUDIO

Input audio (=AUDIOIN)

11
RDBENA*

Active low: enable flex cable data bus drivers (1K pull-up)

12
PCBEN
H
PCB enable for burn-in (always High)

13
HOLD*
H
Active low CPU hold request (always High)

14
IAQHA
nc
IAQ [or] HOLDA (logical or)

15
SENILA*
H
Interrupt level A sense enable (always High)

16
SENILB*
H
Interrupt level B sense enable (always High)

17
INTA*

Active low interrupt level A (=EXTINT*)

18
LOAD*
nc
Unmaskable interrupt (not connected)

19
D7

Data bit 7 (LSB)

20
GND

Ground

21
D5

Data bit 5

22
D6

Data bit 6

23
D3

Data bit 3

24
D4

Data bit 4

25
D1

Data bit 1

26
D2

Data bit 2

27
GND

Ground

28
D0

Data bit 0 (MSB)

29
A14

Address bit 14

30
A15

Address bit 15 (LSB). Also CRU output bit.

31
A12

Address bit 12

32
A13

Address bit 13

33
A10

Address bit 10

34
A11

Address bit 11

35
A8

Address bit 8

36
A9

Address bit 9

37
A6

Address bit 6

38
A7

Address bit 7

39
A4

Address bit 4

40
A5

Address bit 5

41
A2

Address bit 2

42
A3

Address bit 3

43
A0

Address bit 0 (MSB)

44
A1

Address bit 1

45
AMB
H
Extra address bit. Always High.

46
AMA
H
Extra address bit. Always High.

47
GND

Ground

48
AMC
H
Extra address bit. Always High.

49
GND

Ground

50
CLKOUT*

Inversion of phase 3 clock (=PHI3*)

51
CRUCLK*

Inversion of TMS9900 CRUCLOCK pin

52
DBIN

Active high = read memory

53
GND

Ground

54
WE*

Write Enable (derived from TMS9900 WE* pin)

55
CRUIN

CRU input bit to TMS9900

56
MEMEN*

Memory access enable (active low)

57
-12V

-12 Volts 3-T regulator supply voltage (about -16V)

58
-12V

-12 Volts 3-T regulator supply voltage (about -16V)

59
+12V

+12 Volts 3-T regulator supply voltage (about +16V)

60
+12V

+12 Volts 3-T regulator supply voltage (about +16V)

Direction is computer relative world.

Notes:

  • Signals buffered by 74LS244 in connection card: A0-A15, DBIN, MEMEN*, WE*, CLRCLK*, RESET*, CLKOUT.
  • Unbuffered signals: CRUIN, INTA*, AUDIOIN, READY
  • Data bus is buffered by two 74LS245 (one at each end of the cable),driven by RDBENA (direction set by DBIN).
  • All signals must be re-buffered on each card.
  • Always High lines (AMA, AMB, AMC, SENILA*, SENILB*, PCBEN, HOLD*) are pulled up to +5 Volts by 47 Ohms resistors.

Contributor:

Joakim Цgren

Source:

TI-99/4A Card Slot pinout at Technick.net

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.

Document last modified: 2002-01-10

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