Brother HL-1260 service manual ROMOA, OB, 1A, 1B ROM1B

3)The attached Printer SIMM map shows the memory map for 2 SIMMs combined.

(6)ROM block

ROMs store the CPU control program and font data. ROMs are two 16Mbit masked ROMs and two 8Mbit masked ROMs.

Optional sockets are available for two 8Mbit EPROM (µPD27C8000DZ-120 - NEC or equiva- lent) for expansion.

ROM access time should be less than 120nsec.

8Mbit EPROMs can be used instead of a 16Mbit masked ROM.

(7)DRAM block

DRAMs are used for receiving buffer or working area of the CPU. The DRAM block contains four 4Mbit DRAMs, thus having 2MB memory capacity in total.

The refreshing method is CBR (Cas Before Ras). DRAM access time should be less than 80nsec.

$0000-0000

$0400-0000 $0410-0000

$0800-0000

$0C00-0000

ROMOA, OB, 1A, 1B

ROM1B

Not used

MIO

MIO-EOT

FC

(64 MB)

SELROM0(External battery terminal) $0000-0000

	Program ROM
$003F-FFFF	(4MB)

$0040-0000

$0060-0000 Font ROM (2MB)

$007F-FFFF Optional ROM (2MB)

SELROM1(External battery termial)

$1000-0000

$13C0-0000 $13E0-0000 $1400-0000

$1800-0000

$1C00-0000 $1D00-0000 $1E00-0000 $1F00-0000 $1FFF-FFFF

FC

(64MB)

Not used

IRASO

Built-in RAM2MB

SIMM

(max64MB)

Reserve

(64MB)

ASIC internal register

Gate Array (16MB)

CDCC read buffer

BOOT-ROM

$1C00-0000

$1CFF-FFFF

Soft Support Function

Not used

Timer

Serial

CDCC

MED Relation

Not used

HRC/GSC

Memory Wait Control

Interrupt control

Interrupt mask

Memory bank

LSB control

LSB setting

CPU write for LSB

Not used

Figure 3.2 Memory Map

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