Sharp JX-8200 Service Manual page 181

SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
External I/O (for Option Board)
Address
0C000000H Extenal Serial I/O (85C30)
0C000004H
0C000008H
0C00000CH
0C000010H Serial Board FIFO
0C000018H FIFO Status & Reset
09000000H SCSI (reserved)
|
0900001CH
0C000000H LAN Card
|
0C01FFFFH (reserved)
Apple Talk FIFO Register
Address. R/W
0C000018H R
0C000018H W
Flash Memory
This controller supports the Flash Memory that is part of the extended
Flash Memory Board. This memory can be supported file system.
The PowerPage Level 2 interpreter with the 35 Type 1 compatible
font is located in Flash memory area. The following is memory map
for the flash memory.
1f3ffffc
1ee00000
1ec00000
Peripheral
Port Bit Signal Name
7
6
5
4
3 _W/_REQB
2 _HF
1 _EF
0 _FF
7
6
5
4
3
2
1
0 _FFRESET
Download
fonts storage
ares
(6MB)
Not supported
PowerPage L2
(2MB)
BANK0
Serial Port A Control Register
Serial Port A Data Register
Serial Port B Control Register
Serial Port B Data Register
FIFO Data Register
FIFO Status & Reset Register
SCSI Interface Control Register
LAN Card Memory Space
Wait/Request Status of 85C30 PortB
Half Full Flag of the FIFO
Empty Flag of the FIFO
Full Flag of the FIFO
FIFO Reset (Low reset and return to High)
c. RAM/EEPROM
•
DRAM Total 40MByte max.
access time: under 70 nsec.
•
EEPROM 256Byte serial type (M6M80021 or equivalent)
NVRAM for set up memory
13 – 22
Register
Description