Epson TM-U675 - Memory Circuit Board; Program ROM Specifications; Font ROM Specifications; Volatile RAM Specifications

Rev.D Product Overview Appendix D-41
TM-U675/U675P (with autocutter) Service Manual
Confidential
Memory Circuit Board
An outline of the memory board configuration and specifications is provided below.
❏ Program ROM (flash memory, U508)
❏
Font ROM (flash memory, U513)
❏
Volatile RAM (SRAM, U509)
❏
EEPROM for future expansion (electrically erasable NAND memory, U512)
Program Updates
Program downloads can be performed over communication lines (via the interface board).
Table D-2 Program ROM specifications
Item Specification
Application Mainly for storage of programs
Capacity Standard: 4 Mbit
8 Mbits may be used, depending on specifications. Circuit also is compatible with
16 Mbits (reserved)
Access Speed 55 ns
Table D-3 Font ROM specifications
Item Specification
Application Mainly for storage of fonts
Capacity Standard: 4 Mbit
8 Mbits may be used, depending on specifications. Circuit also is compatible with
16 Mbits (reserved)
Access Speed 55 ns
Table D-4 Volatile RAM specifications
Item Specification
Application Receive buffer
Print buffer
Capacity 1 Mbit
Circuit also is compatible with 2 Mbits (reserved), which can be used as external
memory.
Access Speed 55 ns
Other SRAM is used.
Flags and stacks use CPU internal RAM (256 bytes)
Table D-5 Specifications for the EEPROM for future expansion
Item Specification
Model TC5816BFT (Toshiba) etc.
Firmware Support Not determined