- PORT A:D0-D7
- PORT B:D8-D15
- PORT C
- 0: Address Latch A1-A7, A8-15 (to 74574 x2)
- 1: Address Latch A16-A23 (to 74574)
- 2: /C_OE
- 3: /C_CE
- 4: /LO_MEM
- 5: /AS
- 6: /LDSW
- 7: /UDSW
- PORTD
- 0: /CART_IN
- 2: USB D+
- 4: USB D-
残りは空き。 /AS がでてるのは救いだが、 R/W がでてないのがちょっとな...
address の latch は下記。
HC574_1_D[8:1] = cartridge_data[7:0]; HC574_1_CLK = portd0; HC574_1_OE = 0; cartridge_address[7:1] = HC574_1_Q[8:2]; HC574_2_D[8:1] = cartridge_data[15:8]; HC574_2_CLK = portd0; HC574_2_OE = 0; cartridge_address[15:8] = HC574_2_Q[8:1]; HC574_3_D[8:1] = cartridge_data[7:0]; HC574_3_CLK = portd1; HC574_3_OE = 0; cartridge_address[23:16] = HC574_3_Q[8:1];