Alto 1822 Interface cable descriptions
These pages describe various cables and connectors used with Alto-1822 interfaces.
Filed on: [Ivy]<Alto-1822>AICables.memo
Last Modified by L. Stewart November 5, 1978 3:51 PM
Alto internal cable 1822 interface (PC version)
One end is a 40 conductor PC edge connector and the other is a DCC-37S. The wire is 40 conductor ribbon cable.

DCC-37S
Alto cardSignal
connectorconnectorname
1
1TYIB’
20
2TYIB
2
3+2.4
214GND
35RFNHB’
22
6RFNHB
4
7+2.4
238GND
59LIB’
24
10LIB
6
11+2.4
2512GND
713IData’
26
14IData
8
15+2.4
2716GND
917HData’
28
18HData
10
19GND
29
20GND
11
21LHB’
3022LHB
1223RFNIB’
31
24RFNIB
13
25GND
32
26GND
14
27TYHB’
3328TYHB
1529IRT
34
30IMR
16
31GND
35
32GND
17
33blank
36
34blank
18
35HRT
3736HMR
1937blank

38blankNot wired at DCC-37
39blankNot wired at DCC-37
40blankNot wired at DCC-37
Alto 1822 Interface External Extension Cable

One end is a DCC-37P connector and the other is a DCC-37S. The wire is Belden 8775 - 11 shielded pairs or equivilent. The horizontal lines indicate the pairs and corresponding shields.

DCC-37S
WireSignal
connectorcolorname
1RedTYIB’
20
BlueTYIB
2
+2.4
21ShieldGND
3RedRFNHB’
22
GreenRFNHB
4
+2.4
23ShieldGND
5WhiteLIB’
24
BlackLIB
6
+2.4
25ShieldGND
7RedIData’
26
WhiteIData
8
+2.4
27ShieldGND
9OrangeHData’
28
BlackHData
10ShieldGND
29ShieldGND
11
RedLHB’
30BlackLHB
12GreenRFNIB’
31
BlackRFNIB
13ShieldGND
32ShieldGND
14
BrownTYHB’
33BlackTYHB
15RedIRT
34
YellowIMR
16ShieldGND
35ShieldGND
17
blank
36
blank
18
BlueHRT
37BlackHMR
19blank
Alto 1822 PRU cable
One end is a DCC-37P connector and the other is a MIL 48-16R18-31P. The wire is Belden 8775 - 11 shielded pairs or equivilent. The horizontal lines indicate the pairs and corresponding shields.
Notes: The Parc PRU cable is wired with all the color pairs reversed and the ASD PRU cable uses a different kind of wire... These colors should be taken only as a recommendation.

DCC-37S
PRUWireSignal
connectorconnectorcolorname
16RedTYIB’
20
5BlueTYIB
2
+2.4
2131ShieldGND
38RedRFNHB’
22
7GreenRFNHB
4
+2.4
2331ShieldGND
52WhiteLIB’
24
1BlackLIB
6
+2.4
2531ShieldGND
74RedIData’
26
3WhiteIData
8
+2.4
2731ShieldGND
924OrangeHData’
28
23BlackHData
1031ShieldGND
2931ShieldGND
11
22RedLHB’
3021BlackLHB
1218GreenRFNIB’
31
17BlackRFNIB
1331ShieldGND
3231ShieldGND
14
20BrownTYHB’
3319BlackTYHB
1514RedIRT
34
13YellowIMR
1631ShieldGND
3531ShieldGND
17
blank
36
blank
18
12BlueHRT
3711BlackHMR
19blank
Alto 1822 interface to IMP adapter Cable
One end is an DBC-25P and the other is a DCC-37P.
All signal pairs such as 20,21 22,23 ...... 34,35 should be twisted pairs. The colors are for the Maxc2 adapter cable. Groups of wires separated by horizontal lines indicate the cable pairing. The colors are only intended as a suggestion. Note that pins 16 and 35 of the DCC-37P are used twice. (This cable is used between Maxc2 and the IMP).
DCC-37P DBC-25PWireSignal name
1 jump to 2TYIB’ - 2.4v

20
5RedTYIB
2118WhiteGND
3 jump to 4FRNHB’ - 2.4v

22
7GreenRFNHB
2320BrownGND
5 jump to 6LIB’ - 2.4v

24
1YellowLIB
2514BrownGND
7 jump to 8IData’ - 2.4v

26
3OrangeIData
2716BrownGND
288RedHData
1021BrownGND
306VioletLHB
2919WhiteGND
312BlueRFNIB
1315WhiteGND
334GreenTYHB
3217WhiteGND
1511GreenIRT
1624BlackGND
3412RedIMR
1625BlackGND
189YellowHRT
3522BlackGND
3710BlueHMR
3523BlackGND
Alto - 1822 Interface Distant host test plug

This plug loops back the Alto-1822 interface using ’Distant-Host’ signals

Plug type DCC-37P

On the DCC-37P connector Jumper pins
TYIB’
1to14TYHB’
TYIB
20to33TYHB
RFNHB’
3to12RFNIB’
RFNHB22to31RFNIB
LIB’5to11LHB’
LIB
24to30LHB
IData’
7to9HData’
IData26to28HData
IRT15to18HRT
IMR
34to37HMR

Alto - 1822 Interface Local host test plug

This plug loops back the Alto-1822 interface using ’Local-Host’ signals

Plug type DCC-37P

On the DCC-37P connector Jumper pins
TYIB’
1to2+2.4v
RFNHB’
3to4+2.4v
LIB’
5to6+2.4v
IData’7to8+2.4v
TYIB20to33TYHB
RFNHB
22to31RFNIB
LIB
24to30LHB
IData26to28HData
IRT15to18HRT
IMR
34to37HMR
1822 Cable Breakout Box
This is a 122 pin edge-connector wire-wrap board plus several scotchflex to DB-37 adaptors. It is a debugging tool really.

DCC-37
Alto cardCard ACard BSignal
connectorconnectorconnectorconnectorname
1
1123TYIB’
20
26284TYIB
2
3224+2.4
2146385GND
35325RFNHB’
22
66486RFNHB
4
7426+2.4
2386587GND
59527LIB’
24
106688LIB
6
11628+2.4
25126789GND
713729IData’
26
146890IData
8
15830+2.4
27166991GND
917931HData’
28
187092HData
10
191032GND
29
207193GND
11
211133LHB’
30227294LHB
12231234RFNIB’
31
247395RFNIB
13
251335GND
32
267496GND
14
271436TYHB’
33287597TYHB
15291537IRT
34
307698IMR
16
311638GND
35
327799GND
17
331739blank
36
3478100blank
18
351840HRT
373679101HMR
19371941blank

3880102blank
392042blank
4081103blank