X2212 programmer schematic

Parallel port                                      X2212 / X22C12 eeprom

2 (D0) ------------+---------------------------------------- 6  (A0)
3 (D1) ----------+-|---------------------------------------- 5  (A1)
4 (D2) --------+-|-|---------------------------------------- 4  (A2)
5 (D3) ------+-|-|-|---------------------------------------- 3  (A3)
6 (D4) ------|-|-|-|---------------------------------------- 2  (A4)
7 (D5) ------|-|-|-|---------------------------------------- 16 (A5)
8 (D6) ------|-|-|-|---------------------------------------- 17 (A6)
9 (D7) ------|-|-|-|---------------------------------------- 1  (A7)
             | | | |  +------------+
             | | | +--|3 d0    q0 2|-------+---------------- 12 (D0)
             | | +----|4 d1    q1 5|-------|-+-------------- 13 (D1)
             | +------|7 d2    q2 6|-------|-|-+------------ 14 (D2)
             +--------|8 d3    q3 9|-------|-|-|-+---------- 15 (D3)
                   +--|1 /OE  LE 11|--+    | | | |
                   |  +------------+  |    | | | |
                   |  74xx373 or 374  |    | | | |
1 (/C0) -----------+------------------+----|-|-|-|---------- 11 (/WE)
                                           | | | |
15 (S3) -----------------------------------+ | | |
13 (S4) -------------------------------------+ | |
12 (S5) ---------------------------------------+ |
10 (S6) -----------------------------------------+

14 (/C1) --------------------------------------------------> 7  (/CS)
16 (C2)  --------------------------------------------------> 9  (/STORE)
17 (/C3) --------------------------------------------------> 10 (/RECALL)

Also connect grounds: pins 18-25 on LPTx -> pin 10 on '373 -> pin 8 on 2212
Connect 5V to pin 20 on '373, and pin 18 on 2212. If you dont trust your
5v supply, put a 5.1v zener across the X2212 power pins and use a 10ohm
quarter watt resistor in series with the plus supply lead. This may save
the logic chips if you hook it up to 12 volts by mistake (it will certainly
let you know by letting the smoke out of the resistor!).