Flash Rom1 Address Circuit; Flash Pack Circuit (Memory Cassette Rac-9) - Casio TK-6500 Service Manual

6-5. Flash ROM1 address circuit

The Flash ROM1 address signals FA17 to FA20 are made by the following circuit.
The Flash ROM1 (LH28F016SCT-L95, 16M bits) is used for the application program.
CPU address BANK port
A19 A18 A17 FC2
H L L L
L H L
H L H
L
L
H H H X

6-6. Flash Pack circuit (Memory Cassette RAC-9)

The Memory Cassette RAC-9 (2 M bytes) is possible to connect to the Flash Pack connector
CN17 of the Main PCB E475-1.
Flash Pack connector
Flash ROM1 (16M bits)
Flash memory address
FC1 FC0 BANK FA20 FA19 FA18 FA17 Memory block No. 8M bank 16M bank
L L 0 L
L H 1 L
X X 2 A18
H L 3 H
H H 4 H
X X Common L
- 14 -
L A18 A17 02 to 07
H A18 A17 0A to 0F
A17 L L 08,09
10,11,18,19
L A18 A17 12 to 17
H A18 A17 1A to 1F
L L L 00,01
[RAC-9 circuit diagram]
NOTE
Common