Jaguar Adapter for
5200, INTV, and CV

Part 3: INTV Encoder

Lots of ICs. Found the breadboard in the trash at work

PARTS LIST:

(1) 74HC00 Nand Gate IC 
(38) Silicon Diodes
(1) dsub9 connector
(1) Genesis controller or dsub9 extension cable
(1) Connector and cable to bring 5v from intv to adapter


CIRCUIT:                         
                                         
    5v---------Intv_console_5v          gnd-------------Intv_pin 5

    J_1----+---|<---Intv_pin 4          J_2----+---|<---Intv_pin 4
           +---|<---Intv_pin 6                 +---|<---Intv_pin 7

    J_3----+---|<---Intv_pin 4          J_4----+---|<---Intv_pin 3
           +---|<---Intv_pin 8                 +---|<---Intv_pin 6

    J_5----+---|<---Intv_pin 3          J_6----+---|<---Intv_pin 3
           +---|<---Intv_pin 7                 +---|<---Intv_pin 8

    J_7----+---|<---Intv_pin 2          J_8----+---|<---Intv_pin 2
           +---|<---Intv_pin 6                 +---|<---Intv_pin 7

    J_9----+---|<---Intv_pin 2          J_*----+---|<---Intv_pin 1
           +---|<---Intv_pin 8                 +---|<---Intv_pin 6

    J_0----+---|<---Intv_pin 1          J_#----+---|<---Intv_pin 1
           +---|<---Intv_pin 7                 +---|<---Intv_pin 8

  J_pause--+---|<---Intv_pin 4          J_A----+---|<---Intv_pin 6
           +---|<---Intv_pin 8                 +---|<---Intv_pin 7
           +---|<---Intv_pin 2
           +---|<---Intv_pin 6

    J_B----+---|<---Intv_pin 6          J_C----+---|<---Intv_pin 7
           +---|<---Intv_pin 8                 +---|<---Intv_pin 8


    J_North---+---|<---Intv_pin 2
              |      ____
              |_____|    \
               _____| Nor 0-------------,
              |     |____/              |
              |                         |
    J_South---+---|<---Intv_pin 4       |      ____
                                        |_____|    \
                                         _____| Nor 0---Intv_pin 9
                                        |     |____/
    J_East----+---|<---Intv_pin 3       |
              |      ____               |
              |_____|    \              |
               _____| Nor 0-------------'
              |     |____/
              |
    J_West----+---|<---Intv_pin 1

HOW IT WORKS:

Whole lotta diodes going on. :)

An INTV controller does nothing but pulls certain lines low for a given button, so that's all the jag adapter needs to do. The jag pause signal acts like pushing the intv 3 and 7 buttons at the same time which is a pause function for most games.

The 7400 makes the diagonal directions function correctly. Like the genesis adapter on Deathskull Labs, the 16-direction intellivision controller is reduced to 8 directions (4 primaries, 4 diagonals).

The intv pinout is from an intv-2 which I like a lot better than the bigger models. If you insist on using an intv-1 or -3, you can probably connect a dsub9 connector to the controller itself somehow.

There is no 5v at the controller jack, so you'll have to tap it out yourself somehow. My intv had a built-in genesis adapter, so I grabbed the 5v from that jack.

Math Fun is a good game for verifying the keypad. The * key is even a backspace, so you can quickly punch in all numbers at the "number of problems" prompt.