Connector pinout

34 GND 68 GND
33 no connection 67 notcd2
32 memaddr[10] 66 memaddr[11]
31 memaddr[8] 65 memaddr[9]
30 memaddr[6] 64 memaddr[7]
29 memaddr[4] 63 memaddr[5]
28 memaddr[2] 62 memaddr[3]
27 notwait1394 61 not1394_irq
26 GND 60 GND
25 memdata[6] 59 memdata[7]
24 memdata[4] 58 memdata[5]
23 memdata[2] 57 memdata[3]
22 memdata[0] 56 memdata[1]
21 +3.3V 55 not1394_rst
20 notsyswr 54 not1394_cs
19 notmodule_uses_i2c 53 notsysrd
18 +5V 52 +5V
17 +3.3V 51 +3.3V
16 civalid 50 +3.3V
15 cinoterror 49 cistart
14 ci1394[6] 48 ci1394[7]
13 ci1394[4] 47 ci1394[5]
12 ci1394[2] 46 ci1394[3]
11 ci1394[0] 45 ci1394[1]
10 extscl 44 extsda
9 GND 43 GND
8 covalid 42 coclk
7 conoterror 41 costart
6 co1394[6] 40 co1394[7]
5 co1394[4] 39 co1394[5]
4 co1394[2] 38 co1394[3]
3 co1394[0] 37 co1394[1]
2 ciclk 36 notcd1
1 GND 35 GND

MPEG bus out of PACE 2200 (all signals are box to card)

coclk
Clock, other signals should be sampled at rising edge of it.
costart
High for first byte of every 188-byte transport stream packet (the $47 byte)
covalid
High if byte is transferred this clock cycle. Low if no transfer.
co1394[]
Data byte. 7 is MSB, 0 is LSB.
conoterror
Normally high, low if error detected upstream (eg ECC uncorrectable detcted)

MPEG bus into PACE 2200 (all signals are card to box)

ciclk
Clock, box will use rising edge to sample other signals.
cistart
High for first byte of every 188-byte transport stream packet (the $47 byte)
civalid
High if byte is transferred this clock cycle. Low if no transfer.
ci1394[]
Data byte. 7 is MSB, 0 is LSB.
cinoterror
Normally high, low if error detected by card

ST20 processor bus signals

not1394_cs
Chip select from ST20 processor to card
notsyswr
ST20 processor write strobe to card
notsysrd
ST20 processor read strobe to card
memaddr[]
Part of the address bus of the ST20 processor to card
memdata[]
Part of the data bus of the ST20 processor, bidi
notwait1394
Pulled low to extend ST20 cycles for slow cards
not1394_irq
Interrupt from card?

Other signals

notcd1,notcd2
These are usually connected to GND on the card, and are sensed by the box to know when a card is present. By grounding via a transistor, one can dynamically switch presence.
not1394_rst
Reset to card?
extsda,extscl
I2C bus to card. Possibly for an I2C eeprom?
not_module_uses_i2c
Presumably tied low if I2C used by this card?
+5V
5V power supply, limited current available for card use!
+3.3V
3.3V power supply, limited current available for card use!