9 I/O 	  (data lines and reset)
18 Input  (address lines, DBIN, -WE, -ROMG, -CRUCLK, -GS)
 2 Output (CRUIN, GR)

 3   D7     <->  lsb
 5   D6     <->
 7   D5     <->
 9   D4     <->
11   D3     <->
13   D2     <->
15   D1     <->
17   D0     <->  msb

 8  A15     -->   / CRUOUT
23  A14     -->   / MODE:  -DATA / ADDR
10  A13     -->
12  A12     -->
14  A11     -->
16  A10     -->
18   A9     -->
20   A8     -->
22   A7     -->
26   A6     -->
28   A5     -->
30   A4     -->
24   A3     -->

 1   RESET  <--   +RESET

25   DBIN   -->   Memory read
32  -WE     -->   Write enable

34  -ROMG   -->   ROM Access when CPU @ >6000 - >7FFF

 4  -CRUCLK -->   -(TMS9900 CRUCLOCK)
 6   CRUIN  <--   CRU bit to TMS9900

21  -GS     -->   Grom select - access when CPU @ >9800 - >9FFF
27   GRC    -->   GROM clock from VDP
31   GR     <--   GROM ready line to CPU

19   VCC           +5 Volt
29   VDD           -5 Volt
33   VSS
 2   GND           Signal ground
35   GND
36   GND