Sharp JX-8200 Service Manual page 180

SHARP SERVICE MANUAL JX8200SM [13] ELECTRICAL SECTION
b. Memory Map
Description
DRAM
ROM
IO channel 0 (Bi-Parallel I/F)
IO channel 1 (Reserved)
IO channel 2 (Reserved)
IO channel 3 (Apple Talk & RS232C)
Centronics (Internal)
Engine Control (Internal/Video I/F)
Typhoon address space (Not used)
Internal Registers (Not used)
R3741 (IEEE-P1284) Register
Address R/W Port Bit
08000000H R/W
Size
Bank 0 8MBytes
Bank 0a 4MBytes
Bank 0b 4MBytes
Bank 1 4MBytes
Bank 2 4MBytes
Bank 1 8MBytes
Bank 2 8MBytes
Bank 1 16MBytes
Bank 2 16MBytes
Bank 2(CS2) 4MBytes
Bank 1(CS1) 8MBytes
Bank 0(CS0) 8MBytes
R3741 16MBytes
EXternal I/O #1 16MBytes
Miscellaneous 16MBytes
External I/O #0 256MBytes
1MByte
1MByte
16MBytes
Signal Name
7 HBDA Enter Host Busy Data Available
0 - Enter HBPA via interrupt phase
1 - Enter HBPA directly
6 Count Host Timeout Counter Enable
0 - Clear Count
1 - Enable Counter
5 RegBusy Register Busy
0 - Not Busy
1 - Busy
4 Timeout Written by CPU to indicate the Host TimeOut
Counter has reached 1 second.
Cleard automatically when the Host returns to Compatibility
3,,2 1284 Mode Indicates IEEE 1284 Mode
0 - Compatible Mode
1 - Nibble Mode or Nibble ID
2 - Byte Mode or Byte ID
3 - ECP Mode or ECP ID
1 DevID Device ID Byte or Nibble Mode
0 - Not Device ID Byte or Nibble Mode
1 - Device ID Byte or Nibble Mode
0 IPrime IPrime (Init) pulse detected
0 - IPrime not detected
1 - IPrime detected
Address range
00000000H-007FFFFFH
00000000H-003FFFFFH
00400000H-007FFFFFH
00800000H-00BFFFFFH
00C00000H-00FFFFFFH
00800000H-00FFFFFFH
01000000H-017FFFFFH
00800000H-017FFFFFH
01800000H-027FFFFFH
1FC00000H-1FFFFFFFH
1F400000H-1FBFFFFFH
1EC00000H-1F3FFFFFH
08000000H-08FFFFFFH
09000000H-09FFFFFFH
0B000000H-0BFFFFFFH
0C000000H-1BFFFFFFH
0A000000H-0A0FFFFFH
0A000000H-0A0FFFFFH
1D000000H-1DFFFFFFH
Description
13 – 21
Note
Standard
Not used
Standard
Option
Flash memory (PS)(Japan) ROM
(PCL) (EX)
Flash memory
Flash memory