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