Gestetner A193 Service Manual page 708

OVERALL INFORMATION
1.2 OVERALL MACHINE CONTROL
Function
Upgrade
Card
ISDN
G4
Lower Left
CPU BUS
Flash ROM
(2MB)
FCU
Bus Interface
Parallel Interface
Serial Interface
The system block diagram is the same as the current A639 Fax Unit, except
for the following:
•
The DRAM size is increased to 3.5MB (SAF - 2MB, Page Memory -
1MB, ECM - 128kB, and Buffer - 384kB)
•
The clock speed used between VIF and BiCU is increased from
7.03MHz to 10.55 MHz.
(A804)
Feature
HDD
Expander
Interface
2M/4M
Upper
SCP
SRAM R144EFXL
(128kB) Modem
Analog Circuit
Monitor
NCU
Speaker
7-2
Page
80MB Memory
HDD Card
Lower Right
DRAM
(3.5MB)
DMA BUS
VIF
BiCU
A804V500.wmf
SM