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CHAPTER 3 THEORY OF OPERATION
3-5
Fig. 3-5 shows the block diagram of the main PCB of the HL-1250 printer.
Reset Circuit
Program + Font ROM
4.0 Mbytes
RAM
(4.0 Mbytes)
Option RAM (SIMM)
(max. 32Mbytes)
Option Serial I/O
(RS232C & RS422A)
EEPROM (512 x 8 bits)
CPU Core
(MB86832)
A S I C
Oscillator (32.7MHz)
Address Decoder
DRAM Control
Timer
FIFO
CDCC Parallel I/O
Soft Support
EEPROM I/O
Engine Control I/O
To Engine PCB
BUS
INT
To PC
USB I/O
To PC
Fig. 3-5
HL-1250