Brother HL-1020, HL-820, HL-1040 manual II-6

HL-1050

Fig. 2-6 shows the block diagram of the main PCB.

A S I C

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)

Motor Driver

CPU Core
(MB86831)
BUS	INT

Oscillator (33.3MHz)

Address Decoder

DRAM Control

Timer

FIFO

CDCC Parallel I/O

USB I/O

Soft Support

EEPROM I/O

Engine Control I/O

To PC

To PC

To Panel Sensor PCB

Fig. 2-6

II-6