Copyright(C) 1994,1995,1996,1997 Terumasa KODAKA , Takeshi KONO
■I/O ports specific to the 98NOTE series
Target: 98NOTE
Explanation: The 98NOTE series has many special features not found on desktop models.
------------+-------+-----+------------------------------------------
I/O address | Width | R/W | Name
------------+-------+-----+------------------------------------------
0800h | BYTE | R/W | Tablet related
0802h | BYTE | R/W | Tablet related
0804h | BYTE | R/W | Tablet related
8810h | BYTE | R/W | Power status, etc.
198Eh | BYTE | R/W | Card related
498Eh | BYTE | R/W | Power saving mode related
998Eh | BYTE | R/W | LCD upside down
C98Eh | BYTE | W | LCD inversion
D98Eh | BYTE | R/W | Battery refresh control
2B8Eh | BYTE | R/W | SMI request
6B8Eh | BYTE | R/W | Dedicated expansion RAM board capacity reading
8B8Eh | BYTE | R/W | SMRAM mapping control
9B8Eh | BYTE | R/W | Cache area control
FC8Eh | BYTE | R/W | I/O card usage interrupt channel setting
3D8Eh | BYTE | R/W | Warning beep
4D8Eh | BYTE | R/W | Battery monitoring
AD8Eh | BYTE | R/W | Read battery status
CD8Eh,DD8Eh | BYTE | R/W | I/O port for saving modem settings
ED8Eh | BYTE | R/W | I/O port for saving NOTE settings
FD8Eh | BYTE | R/W | I/O port for saving RAM DRIVE settings
0E8Eh | WORD | R/W | DA bank address setting
1E8Eh | WORD | R/W | Bank RAM switching
2E8Eh | WORD | R/W | Built-in protected memory capacity
4E8Eh | BYTE | R/W | ROM bank selection
5E8Eh | WORD | R/W | LED/LCD settings
6E8Eh | BYTE | R/W | Built-in modem control for NOTE (1)
7E8Eh | BYTE | R/W | Built-in modem control for NOTE (2)
8E8Eh | BYTE | R/W | Various NOTE controls
9E8Eh | BYTE | R/W | Various NOTE controls
AE8Eh | BYTE | R/W | Various NOTE controls
BE8Eh | BYTE | R/W | Various NOTE controls
CE8Eh | BYTE | R/W | Various NOTE controls
EE8Eh | BYTE | R/W | EGC mask settings
FE8Eh | BYTE | R/W | SMI mask settings
0F8Eh | BYTE | R/W | 98NOTE expansion card slot
1F8Eh | BYTE | R | Read card type register
4F8Eh,5F8Eh | WORD | R/W | I/O mapped serial memory
6F8Eh | BYTE | R/W | Set DMA channel used by I/O card
7F8Eh,8F8Eh | WORD | R/W | I/O trap control
9F8Eh,AFE8h | WORD | R/W | I/O trap control
BF8Eh | WORD | R/W | I/O trap control
------------+-------+-----+------------------------------------------
* Basically, I/O address xy8Eh (x is 0-F, y is 8-F) is used to control special
functions of 98NOTE.
o Some of these I/Os are used for similar purposes on desktop models.
Related I/O 08F0h,08F2h
I/O 0900h,0906h
I/O 0800h
Name Tablet related
Undocumented
Target PC-9801P
Function
[READ]
When read a maximum of 11 times, bit 7 becomes 1.
Number of times INT 1Fh-9B0Dh
I/O READ value register D800h work address
0 bit 6-3 --> AL bit 3-0 2007h
1 bit 6-2 --> AH bit 4-0 2006h Tap, button status
2 bit 6-1 --> SI bit 13-8 2009h (X MSB)
bit 0 --> SI bit 7 2008h (X LSB)
3 bit 7-0 --> SI bit 7-0 2008h (X LSB)
4 bit 5 --> AH bit 7 2006h Pen inside screen
5 bit 6-1 --> DI bit 13-8 2009h (Y MSB)
bit 0 --> DI bit 7 2008h (Y LSB)
6 bit 7-0 --> DI bit 7-0 2008h (Y LSB)
7 bit 6 --> CH bit 7 202Dh Tilt to the left or right
Extends 7-bit signed value to 8-bit
8 bit 6 --> CL bit 7 202Ch Tilt to the front or back
Extends 7-bit signed value to 8-bit
9 bit 7-0 --> BL bit 7-0 202Ah ?
10 bit 7-0 --> BH bit 7-0 202Bh Pen distance
[WRITE]
bit 7-0: Command
* Details unknown
Explanation o Reads tablet information and controls it.
o Details unknown.
u This I/O is also available on the PC-9801NS/R, but does not actually work.
Related INT 1Fh PENBIOS
I/O 0804h
Name Tablet related
Undocumented
Target PC-9801P
Function
[WRITE]
Bit 7-0: Details unknown
[READ]
Bit 7: Command READY
1 = Commands can be accepted
0 = Commands cannot be accepted
Bit 6: Pen detection
1 = Pen is detected.
0 = Pen is not detected
Bit 5-2: Unknown
Bit 1: Unknown
Bit 0: Unknown
Explanation o Reads tablet information and controls it.
o Details unknown.
u PC-9801NS/R also has this I/O, but it does not actually work.
Related INT 1Fh PENBIOS
I/O 8810h
Name Power status, etc.
Undocumented
Target PC-9801N, NS, NS/E, NC, NS/T, NL, NS/L, NA, NS/R, P, NX/C, NS/A, NL/R
PC-9821Ne
PC-98HA
Function
[READ]■[98NOTE]
bit 7: CRT pack connection flag■[PC-9801NS/T, NA, NS/R, NX/C]
1 = CRT pack is connected
0 = CRT pack is not connected
bit 6: Unknown■[PC-9801NC,PC-9821Ne]
bit 5: Color LCD flag■[PC-9801NS/R, NX/C]
1 = Color LCD model
0 = Monochrome LCD model
* In reality, the color LCD model of the PC-9801NS/R was not released.
In fact, a monochrome LCD model of the PC-9801NX/C was never released.
bit 5:
I/O unit connection status ■ [PC-9801P]
1 = connected
0 = not connected
bit 4: Unknown ■ [PC-9801NS/R or later]
bit 3: Backup switch ■ [PC-9801NS/T･NL･NS/L･NA･NS/R･P･NX/C･NS/A PC-9801NL/R, PC-9821Ne]
1 = Backup switch ON
0 = Backup switch OFF
bit 2: AC adapter
1 = Running on AC adapter
0 = No AC adapter
bit 1: Low battery
1 = Low battery
0 = Battery remaining
bit 0: Expansion I/O box ■ [PC-9801NS/T･NL･NS/L･NA･NS/R･P･NX/C･NS/A･NL/R PC-9821Ne]
1 = connected
0 = not connected
[READ]■[PC-98HA]
bit 7: Docking station status
0 = PC-98HA alone
1 = PC-98HA + docking station
bit 6: AC adapter
1 = AC adapter connected
0 = Battery powered
bit 4: Unknown
bit 3: Unknown (usually 1)
bit 2: Lithium battery status
1 = Lithium battery is LOW BATTERY
0 = Lithium battery is charging
bit 1: Battery status
1 = LOW BATTERY
0 = Charging
bit 0: POWER SW■[PC-98LT･HA]
1 = OFF
0 = Normal
[WRITE]■[PC-98LT･HA,PC-9801LV]
bit 5: Unknown
bit 2: Standby mode setting■[PC-98HA]
1 = Enter standby mode
0 = Normal
bit 0: Power off
1 = Yes
0 = No
Explanation o Gets the status of the power supply type, etc.
Related 0000:0480h
0000:045Ch
I/O AD8Eh
I/O 198Eh
Name Card related
Target PC-9801NS/R･P･NX/C･NS/A, PC-9821Ne
Function
[READ/WRITE]
bit 7-6: Unknown
bit 5: Modem card selection
1 = Main unit RS-232C selection
0 = Card slot
bit 4-0: Unknown
Explanation o Select whether to process RS-232C using the main unit's USART or the modem card in the card slot.
Related I/O 0F8Eh
I/O 1F8Eh
I/O 498Eh
Name Power saving mode related
Undocumented
Target PC-9801NS/R･P･NX/C･NS/A･NL/R, PC-9821Ne
PC-9821Ap･As･Ae･Ce･Af
Function
[READ/WRITE]
bit 7: Unknown ■ [PC-9821Ne, PC-9801NS/A]
bit 6-1: Unused (set to 0)
bit 0: Power saving mode control
0 = Do not save power
1 = Save power
Explanation o Used in power saving mode.
o Halves the CPU clock
I/O 998Eh
Name LCD inversion
Undocumented
Target PC-9801NS/R･P･NL/R
Function
[READ/WRITE]
Bits 7-2: Unused (set to 0)
Bit 1: Monochrome screen freeze
0 = Do not freeze
1 = Freeze
Bit 0: Invert
0 = Do not invert
1 = Invert
Explanation u Sets LCD inversion. Only inverts the screen upside down, not upside down.
o On the PC-9801P, the SMM monitors the screen inversion switch and operates this I/O port.
Related INT 1Fh - Function 92h
I/O C98Eh
Name LCD inversion
Undocumented
Target PC-9801NL/A
Function
[WRITE]
bit 7-2: Unused (set to 0)
bit 1: LCD inversion
1 = Reverse
0 = Normal
bit 0: Unused (set to 0)
Explanation o Sets LCD inversion.
o On the PC-9801NL/A, the LCD inversion state does not change just by
manipulating I/O 871Eh bit 0. To change the actual hardware state, you need to
manipulate this I/O port.
Related I/O 871Eh bit 0
I/O D98Eh
Name Battery refresh mode setting
Undocumented
Target PC-9801NS/R･P･NX/C, PC-9821Ne
Function
[READ/WRITE]
Bit 7-1: Unused
Bit 0: Battery refresh mode
1 = Set
0 = Cancel
Explanation u Set battery refresh mode
Related
I/O E98Eh
Name Unknown
Undocumented
Target PC-9801NL/A
Function
[READ/WRITE]
Bit 7-1: Unused
Bit 0: Unknown
Explanation o Details unknown
Related
I/O 2B8Eh
Name SMI request
Undocumented
Target SMM-equipped machine
Function
[READ]
Bit 15-9: Unused?
Bit 8: Cache full ■ [PC-9801NS/T]
0 = Cache not full
1 = Cache full
Bit 7-1: Unused?
bit 0: SMI request
1 = SMI request in progress
0 = No SMI request
[WRITE]
bit 15-1: Unused?
bit 0: SMI request
1 = SMI request in progress
0 = No SMI request
Description o Generates an SMI.
Related I/O FE8Eh
I/O 6B8Eh
Name Read dedicated expansion RAM board capacity
Undocumented
Target PC-9801NS/T･NA･NS/R･NX/C･NS/A･NL/R･NL/A, PC-9821Ne
Function
[READ] PC-9801NS/T expansion RAM board ■ [PC-9801NS/T]
bit 7-2: Unused
bit 1-0: Expansion RAM board capacity
11b = Undefined
10b = Internal expansion 2MB
01b = Internal expansion 6MB
00b = No internal expansion
[READ] PC-9801NA expansion RAM board ■ [PC-9801NA]
bit 7-2: Unused
bit 1-0: Expansion RAM board capacity
11b = No internal expansion
10b = Internal expansion 2MB
01b = Internal expansion 4MB
00b = 8MB internal expansion
[READ] PC-9801NS/R expansion RAM board ■ [PC-9801NS/R]
bit 7-3: Unused
bit 2-0: Expansion RAM board capacity
111b = No internal expansion
110b = 2MB internal expansion
101b = 4MB internal expansion
100b = 6MB internal expansion
011b = 8MB internal expansion
010b = 10MB internal expansion
001b = Undefined
000b = Undefined
[READ] PC-9801P internal RAM capacity ■ [PC-9801P]
bit 7: Always returns to 1
bit 6-3: Unused
bit 2-0: PEN internal RAM capacity
Always changes to 100b
100b = 6MB internal memory
[READ] PC-9801NX/C additional RAM board information, etc. ■ [PC-9801NX/C]
bit 7: Standard installed memory identification
1 = HDD model (3.6MB)
0 = FDD model (1.6MB)
bit 6-3: Unused
bit 2-0: Additional RAM board capacity
111b = No internal expansion
110b = Internal expansion 2MB
101b = Internal expansion 4MB
100b = Internal expansion 6MB
011b = Internal expansion 8MB
010b = Internal expansion 10MB
001b = Internal expansion 12MB
000b = Undefined
[READ] PC-9821Ne additional RAM board information, etc. ■ [PC-9821Ne]
bit 7: Standard installed memory identification
1 = HDD model (5.6MB)
0 = FDD model (3.6MB)
bit 6: Unused?
bit 5: Built-in speaker
1 = Use
0 = Not use
bit 4: Status indicator
1 = Use
0 = Not use
bit 3: Pointing device selection
1 = Use thumbball
0 = Use mouse
bit 2-0: Additional RAM board capacity
111b = No internal expansion
110b = Internal expansion 2MB
101b = Internal expansion 4MB
100b = Internal expansion 6MB
011b = Internal expansion 8MB
010b = Internal expansion 10MB
001b = Internal expansion 12MB
000b = Undefined
[READ] PC-9801NS/A Additional RAM board information ■ [PC-9801NS/A]
bit 7: Standard installed memory identification
1 = HDD model (3.6MB)
0 = FDD model (1.6MB)
bit 6: Unused
bit 5: 16MB system space
1 = Normal RAM
0 = ROM image
bit 4: Battery refresh
1 = Yes
0 = No
bits 3-1: Additional RAM board capacity
111b = No internal expansion
110b = 2MB internal expansion
101b = 4MB internal expansion
100b = 6MB internal expansion
011b = 8MB internal expansion
010b = 10MB internal expansion
001b = 12MB internal expansion
000b = 16MB internal expansion
bit 0: Unknown
[READ] PC-9801NL/R additional RAM board ■ [PC-9801NL/R]
bit 7: Standard installed memory identification
1 = HDD model (3.6MB)
0 = FDD model (1.6MB)
* However, the PC-9801NL/R was only released in the HDD model
bit 6-3: Unused
bit 2-0: Additional RAM board capacity
111b = No internal expansion
110b = Internal expansion 2MB
101b = Internal expansion 4MB
100b = Internal expansion 6MB
011b = Internal expansion 8MB
010b = Internal expansion 10MB
001b = Internal expansion 12MB
000b = Undefined
[WRITE] PC-9821Ne thumbball/mouse ■ [PC-9821Ne]
bit 7-6: Not used
bit 5: Built-in speaker
1 = Use
0 = Do not use
bit 4: Status indicator
1 = Use
0 = Do not use
bit 3: Pointing device selection
1 = Use thumbball
0 = Use mouse
bit 2-0: Do not use
[WRITE] PC-9801NS/A Additional RAM board information ■ [PC-9801NS/A]
bit 5: 16MB system space
1 = Normal RAM
0 = ROM image
bit 4: Battery refresh
1 = Yes
0 = No
[WRITE] PC-9801NL/A Additional RAM board information ■ [PC-9801NL/A]
bit 5: 16MB system space
1 = Normal RAM
0 = ROM image
bit 4: Battery refresh
1 = Yes
0 = No
Description o Reads the capacity of the dedicated additional RAM board.
u You can tell whether it's a model with HDD or FDD by the memory capacity
built into the device.
Related
I/O 8B8Eh
Name SMRAM mapping control
Undocumented
Target PC-9801NS/R･P･NX/C･NS/A･NL/R, PC-9821Ne
Function
[READ/WRITE]
bit 7-2: Unknown
bit 1: SMRAM mapping
1 = Yes
0 = No
bit 0: Unknown
Explanation o Maps SMRAM to main memory
u Destroying SMRAM may result in the power not even being turned off, so do not use it under any circumstances
u In the PC-9821Ne, this I/O port is used to patch SMRAM to correct the built-in calendar clock μPD4993 using IO.SYS.
Related I/O FE8Eh
I/O 9B8Eh
Name Cache area control
Undocumented
Target PC-9821Ne, PC-9801NS/A
Function
[WRITE]
Bit 7-4: Unknown
* Set to 1101b when cache is enabled.
Bit 3-0: Cache area upper limit setting
0000b = 000000-0FFFFFh area cache enabled
0001b = 000000-1FFFFFh area cache enabled
: :
1101b = 000000-DFFFFFh area cache enabled
1110b = 000000-EFFFFFh area cache enabled
1111b = 000000-EFFFFFh area cache enabled
Explanation o Sets the cache enabled area of the dedicated internal memory.
o Details unknown
Related I/O 6B8Eh
I/O 4C8Eh
Name Pointing device selection
Undocumented
Target PC-9821Np, Ns, Ne2, Nd, Ld, Lt, Nf, Nm, Ne3, Nd, Na7, Nx, PC-9801NL/A
Function
[READ/WRITE]
bit 7-1: Unused (set to 0)
bit 0: Pointing device selection
1 = Mouse
0 = Thumbball ■ [Except PC-9821Na7, Nx]
0 = 98 Slide Pad ■ [PC-9821Na7, Nx]
Explanation o Selects the pointing device. If you select mouse, you can get a
signal from the external mouse connector.
Related I/O 8C1Eh bit 4
I/O FC8Eh
Name I/O card interrupt channel setting
Undocumented
Target PC-9801NS/T･NL･NS/L･NA･NS/R
Function
[WRITE]
bit 7: Always 1
bit 6-4: Interrupt B channel
111b = Do not use interrupt
110b = INT6
101b = INT5
100b = INT4
011b = INT3
010b = INT2
001b = INT1
000b = INT0
bit 3: Always 1
bit 2-0: Interrupt B channel
111b = Do not use interrupt
110b = INT6
101b = INT5
100b = INT4
011b = INT3
010b = INT2
001b = INT1
000b = INT0
Explanation o Sets the interrupt channel used by the I/O card
Related I/O 8E1Eh
I/O 3D8Eh
Name Battery warning beep
Undocumented
Target 98NOTE■[Excluding N/NS]
PC-9821■[Excluding the original/Ap/As/Ae/Af]
PC-9801BA2/BS2/BX2/BA3/BX3/BX4
Function
[READ/WRITE]
bit 7-4: Unused (always 0)
bit 3: Unknown
bit 2: Unknown
bit 1: Battery warning beep
1 = Beep
0 = Do not beep
bit 0: Unused (always 0)
Function u Operates independently of the normal beep. Pitch is fixed at 2.4kHz.
In 98NOTE and 98PEN, this is used as a warning sound when the battery is low.
In PCMCIA2.0 equipped machines, CARDSET.SYS uses this sound when changing cards.
Related
I/O 4D8Eh
Name Battery monitor
Undocumented
Target PC-9801NS/T and later
Function
[READ/WRITE]
bit 7: Unused
bit 6: Unknown
bit 5-1: Unused
bit 0: Battery monitor
1 = Voltage level was maintained
0 = Voltage level dropped once
Explanation o Used to check if data is valid when returning from suspend resume.
o Indicates whether the battery voltage level was maintained while the power was off.
Related
I/O AD8Eh
Name Battery status read
Undocumented
Target PC-9801NS/E･NC･NS/T･NS/L･NA･NS/R･P･NX/C･NS/A
PC-9821Ne･Np･Ns･Ne2･Nd･Nf･Ne3･Nd2･Na7･Nx
Function
[WRITE]
bit 7: Battery selection ■ [PC-9821Ne excluded]
1 = 2nd battery selection (but invalid for NL･NS/L)
0 = 1st battery selection
bit 5: Battery selection ■ [PC-9821Ne only]
1 = 2nd battery selection
0 = 1st battery selection
[READ]
bit 7: Battery selection ■ [PC-9821Ne excluded]
1 = 2nd battery selection
0 = 1st battery selection
bit 6: Status valid flag
1 = Battery status valid
0 = Battery status invalid
bit 5: Battery selection ■ [PC-9821Ne only]
1 = 2nd battery selection
0 = 1st battery selection
bit 3-0: Battery status ■ [PC-9801NS/E･NC]
0nnnb = Battery remaining capacity [0-7]
1111b = Battery remaining capacity [8]
1001b = Battery remaining capacity [0]
1000b = Battery not connected
1100b = Battery abnormality
bit 4-0: Battery status ■ [PC-9801NS/T or later]
x1xxxb = Undetermined
00nnnb = Battery remaining capacity [0-7]
10111b = Battery remaining capacity [8]
10001b = Battery remaining capacity [0]
10000b = Not connected
10010b = Initial charge or deep discharge (determined by I/O 8810h)
10100b = Abnormal
10xxxb = Invalid
Explanation o Reads remaining battery power, etc.
Related I/O 8810h
INT 1Fh - Function 9A0Ah
I/O CD8Eh,DD8Eh
Name I/O port for saving modem settings
Undocumented
Target PC-9801N, NS, NS/E, NC
Explanation o Saves modem settings.
u Uses software dip switches for NS/T and later.
Related I/O 6E8Eh,7E8Eh
INT 1Fh - Function 96h
INT 1Fh - Function 97h
I/O ED8Eh
Name I/O port for saving NOTE settings
Undocumented
Target PC-9801NS/E･NC
Function
[READ/WRITE]
Bits 7-4: Auto power off time setting
1111b = Do not use auto power off
:
0000b = Auto power off 1 minute
Bits 3,2: EMS function setting
11b = Not used
10b = Sound
01b = Network
00b = Use
Bits 1,0: Built-in modem setting
11b = Half-duplex
10b = AT
01b = V25bis
00b = Not used
Explanation o Used to save various information set in the NOTE menu.
u NS/T and later use software DIP switches.
Related
I/O FD8Eh
Name I/O port for saving RAM DRIVE settings
Undocumented
Target PC-9801NS/E･NC
Function
[READ/WRITE]
bit 7: Parity matching (ODD)
* Serves as parity for both I/O FD8Eh and I/O ED8Eh
bit 6: Memory for RAM drive
1 = Not used
0 = Used
bit 5: Note menu patch information
1 = Yes
0 = No
bit 4: RAM drive write
1 = Prohibited
0 = Permitted
bit 3: First drive specification
1 = FDD
0 = RAM drive
bit 2,1: System startup device specification
11b = FD priority
10b = RAM DRIVE
01b = FD
bit 0: RAM drive
1 = Used
0 = Not used/Protected memory
Explanation o
Related
I/O 0E8Eh
Name DA bank address setting
Undocumented
Target 98NOTE■[PC-9821Np･Ns･Ne2･Nd･Es･Ld･Lt･Nf･Nm･Ne3･Nd2･Na7･Nx, excluding PC-9801NL/A]
Function
[READ/WRITE]
bit 15-8: Upper 8 bits of bank RAM address
■[PC-9801NS/T･NL･NS/R･P･NX/C･NS/A･NL/R,PC-9821Ne]
bit 7-0: Bank RAM address
* The use of bank RAM varies depending on the model
Explanation o Sets the bank address that appears in DA000-DBFFFh.
u When selecting bank RAM for the RAM drive, the capacity of the dedicated additional memory must be taken into consideration.
u This I/O is also used to set the window projection address of the PCMCIA card.
Related 0000:048Eh bit 6-4■[PC-9801NS/T･NL･NS/R･P･NX/C･NS/A･NL/R,PC-9821Ne]
0000:059Ch
I/O 1E8Eh
I/O 6E8Eh
I/O 1E8Eh
Name Bank RAM switching
Undocumented
Target PC-9801NL, PC-98HA
Models with IDE
Function
[READ/WRITE]
bit 7-0: Bank switching
10000000b(80h) = ROM image to DA000-DBFFFh
10000001b(81h) = IDE work RAM selection to DA000-DBFFFh■[DESKTOP]
10000001b(81h) = Bank RAM selection to DA000-DBFFFh■[NOTE]
10000010b(82h) = PC card window selection to DC000-DDFFFh■[HA only]
10000100b(84h) = PC card window selection to DA000-DBFFFh
■[PC-9801NL･P･NX/C･NS/A･NL/R, PC-9821Ne]
10010000b(90h)= Select ROM disk from DA000 to DBFFFh■[PC-9801NL only]
Explanation u Sets the type of bank memory that appears from DA000 to DBFFFh.
u Sets the type of bank memory that appears from DC000 to DDFFFh.
o Used by MECIA3 to project PC card memory.
Related 0000:059Dh
I/O 0E8Eh
I/O 2E8Eh
Name Internal protected memory capacity
Undocumented
Target PC-9801NS/A
Function
[WRITE]
bit 7-1: Unused
bit 0: RAM DRIVE memory usage
0 = Used as RAM drive
1 = Used as protected memory
Related I/O 871Eh bit4
I/O 4E8Eh
Name ROM bank selection
Undocumented
Target 98NOTE
Function
[READ/WRITE]
bit 7: Bank ROM appearance flag ■ [Other than PC-9821Na7/Nx]
1 = Bank ROM appears
0 = Bank ROM is masked
bit 6-0: Bank ROM address setting
Explanation o Sets the address of the bank ROM that appears in D8000-D9FFFh
Related
I/O 5E8Eh
Name LED/LCD setting
Undocumented
Target 98NOTE series
Function
[READ/WRITE]■[PC-9821Ne･Np･Ns･Ne2･Nd･Nf･Ld･Lt･Nm･Ne3･Nd2･Na7･Nx excepted]
bit 7: Unknown■[PC-9801NS/T and later]
bit 6: Unknown■[PC-9801NS/A]
bit 6-4: Unused(?)
bit 3,2: RAM DRIVE LED setting
11b = Red
10b = Red
01b = Amber
00b = Off
bit 1: Unused(?)
bit 0: FDD LED setting
1 = Amber
0 = Off
[READ/WRITE]■[PC-9821Ne･Np･Ns･Ne2･Nd･Nf･Ld･Lt･Nm･Ne3･Nd2･Na7･Nx]
bit 7: Unknown
bit 6: Unknown
bit 5: Unused(?)
bit 4: FDD pattern
1 = On
0 = Off
bit 3: RAM chip pattern
1 = On
0 = Blinking/Off
* Once lit, this bit cannot be used to turn it off.
For PC-9821Ne, you can turn off the RAM chip pattern by using I/O 6B8Eh to set
the status indicator to not be used.
bit 2: Bar below RAM
1 = On
0 = Off
bit 1: Unused
bit 0: Bar below FDD
1 = On
0 = Off
Explanation u Controls the various LEDs on the NOTE.
u In PC-9821Ne, Np, Ns, Ne2, Nd, Ld, Lt, and Nf, it controls the status indicator.
Related I/O 6B8Eh■[PC-9821Ne]
I/O 6E8Eh
Name Internal modem control for NOTE (1)
Undocumented
Target 98NOTE series (excluding NL/NS/L/P/NS/A/NL/R/Ne), HA+ docking station
Function
[READ] None
[WRITE]
bit 7: Buzzer stop
1 = No
0 = Yes
bit 6,5: Dial mode
11b = 20PPS
01b = 10PPS
00b = Tone
bit 4: Loopback test
1 = No
0 = Yes
bit 3,2: Communication speed
11b = AUTO
10b = 1200bps
01b = 300bps
00b = 2400bps
bit 1,0: Modem mode
10b = CALL
01b = ANS
00b = AUTO
Explanation o
Related I/O CD8Eh■[Up to PC-9801NC]
I/O 891Eh■[PC-9801NS/T and later]
I/O 7E8Eh
INT 1Fh - Function 96h
INT 1Fh - Function 97h
I/O 6E8Eh
Name Mouse emulation (button)
Undocumented
Target PC-9801P
Function
[WRITE]
bit 7: LEFT
bit 6: Unused(?)
bit 5: RIGHT
bit 3-0: Unknown
Explanation o For PC-9801P mouse emulation, it is used to emulate the state of the mouse buttons visible from the mouse port.
Related I/O 7FD9h
I/O 7FDDh
I/O 7E8Eh
Name Internal modem control for NOTE (2)
Undocumented
Target 98NOTE series (excluding NL/NS/L/P/NS/A/NL/R/Ne), HA+ docking station
Function
[READ] None
[WRITE] Modem control
bit 7: Use modem
1 = Yes
0 = No
bit 6: Not in use?
bit 5: Loss of carrier disconnect
1 = No
0 = Yes
bit 4: Select CI option
1 = No
0 = Yes
bit 3: Select CD option
1 = No
0 = Yes
bit 2: Confirm answer tone
1 = No
0 = Yes
bit 1: Send answer tone
1 = No
0 = Yes
bit 0: Automatic answer
1 = No
0 = Yes
Explanation o
Related I/O DD8Eh■[PC-9801NS･NV･NS/E･NC]
I/O 8A1Eh■[PC-9801NS/T and later]
I/O 6E8Eh
INT 1Fh - Function 96h
INT 1Fh - Function 97h
I/O 8E8Eh
Name NOTE Various Controls
Undocumented
Target PC-9801NS/NV/NS/E/NC
Function
[READ/WRITE] Software DIP Switch
bit 7: Internal FDD drive number
1 = 1,2
0 = 3,4
bit 6: Parity matching
bit 5: Main memory capacity
1 = 640KB
0 = 512KB
bit 4: CPU mode
1 = V30 10MHz equivalent
0 = i386SX
bit 3: GDC clock
1 = 2.5MHz
0 = 5.0MHz
bit 2: Graphics mode
1 = Basic mode
0 = Extended mode
bit 1,0: RS-232C synchronization
11b = Asynchronous synchronization
10b = Synchronized clock
01b = ST2 synchronization
00b = BCI synchronization
Explanation o Used to save various information set in the Note menu.
u Software DIP switches are used in NS/T and later.
Related
I/O 9E8Eh
Name NOTE various controls
Undocumented
Target PC-9801NS/NV/NS/E/NC
Function
[READ/WRITE] Get/set various status
bit 7: Parity adjustment
bit 6: Memory switch
1 = Do not hold
0 = Hold
bit 5: Unknown
bit 4: VF key
1 = Use
0 = Do not use
bit 3: Internal HDD
1 = Use
0 = Disconnect
Explanation o Used to save various information set in the Note menu.
u Software DIP switches are used in NS/T and later.
Related
I/O AE8Eh
Name NOTE various controls
Undocumented
Target PC-9801NS/NV/NS/E/NC
Function
[READ/WRITE] Get/set various status
bit 7: Parity match (Odd)
bit 6,5: BEEP volume control
11b = Maximum
10b = :
01b = :
00b = Mute
bit 4: Internal drive number
bit 3: LCD grayscale
1 = 2 grayscale
0 = 8 grayscale
bit 2: LCD inversion
1 = Reverse (blue/black background)
0 = Normal (white background)
bit 1: GDC clock
1 = 2.5MHz
0 = 5.0MHz
bit 0: GRPHmode
1 = Basic mode
0 = Extended
Explanation o Saves various hardware settings.
u For NS/T and later, use software DIP switches.
Related
I/O BE8Eh
Name NOTE Various Controls
Undocumented
Target PC-9801NS/NV/NS/E/NC
Function
[READ/WRITE]
bit 7: Parity Match (Odd)
bit 6,5: Unused?
bit 4: Resume
1 = Yes
0 = No
bit 3: HDD sector capacity
1 = 512 bytes/sector
0 = 256 bytes/sector
bit 2: RS-232C
1 = Use
0 = Not used
bit 1: CRT mode
1 = Plasma display mode
0 = CRT mode
bit 0: RAMmode
1 = Extended RAM
0 = Compatible drive
Explanation o Gets and sets RAM mode, etc.
u For NS/T and later, use software DIP switches.
Related 0000:0457h bit7
0000:0400h bit5
I/O 08F0h,08F2h - 0056h bit0
I/O 006Ah - 40h,41h
I/O CE8Eh
Name LCD control for NOTE
Undocumented
Target PC-9801NS
Function
[READ/WRITE]
bit 7: LCD light
1 = ON
0 = OFF
bit 6-0: Unused?
Explanation o Gets and sets the LCD light status.
Related
I/O EE8Eh
Name EGC mask setting
Undocumented
Target PC-9801NV･NS/E･NC
Function
[READ/WRITE]
bit 7-1: Unused
bit 0: EGC mask
1 = Do not mask EGC (when resume is not set)
0 = Mask EGC (when resume is set)
Explanation o Sets and cancels EGC mask.
o Since EGC does not support resume on PC-9801NS/E･NC, setting resume will disable EGC.
u The PC-9801NV is equipped with an EGC, but the ITF is set so that the EGC cannot be used regardless of the resume setting.
o For the PC-9801NS, it is used for a different purpose.
Related 0000:054Dh bit6
I/O 04A0-04AEh
I/O FE8Eh
Name SMI mask setting
Undocumented
Target PC-9801NS/T･NS/R･P･NX/C･NS/A･NL/R, PC-9821Ne
Function
[READ/WRITE]
bit 7-1: Unused (always 1)
bit 0: SMI enabled
0 = SMI disabled
1 = SMI enabled
Explanation o Disables/enables the occurrence of SMI.
o For machines equipped with SMM, power OFF and other operations are also
performed within SMM, so SMI should not be stopped for long periods of time.
Related I/O 2B8Eh
I/O 0F8Eh
Name 98NOTE expansion card slot
Undocumented
Target PC-9801N, NS, NV, NS/E, NC, NS/T, NL, NS/L, NA, NS/R
PC-98DO+
PC-9801UR, UF, US
Function
[READ]
Read card ID/expansion card ID After reset, or when reading immediately
after reading from 1F8Eh, the card ID is read. After reading from 0F8Eh once,
the expansion card ID is read.
・Card ID
NEC product bit 7 = 0
bit 6 = 0, bit 5-0 = card type
bit 6 = 1, bit 5-0 = reserved
Third-party product bit 7= 1
bit 6-0: Manufacturer code
・Expansion card ID bit 7-0 = card type
01h = expansion RAM card
03h = full-duplex modem card
[WRITE]
Card switch register write Register for writing card-specific setting information
・Expansion RAM card (PC-9801N-01U, 02U, 03, 04)
bit 7-4: A23-A20 Memory start address
bit 3: SWU C8000-CFFFFh enable control
1 = disable
0 = enable
bit 2: SWL C0000-C7FFFh enable control
1 = disable
0 = enable
bit 1: WAT RDY terminal timing
1 = Shortened (wait cancel)
0 = Normal
bit 0: ENB Memory access enable control
1 = Enable
0 = Disable
・Recommended usage of I/O cards
bit 7-2: Open to user
bit 1: RSM Resume state notification
1 = Notifies that reset or resume has been canceled.
0 = Notifies that resume has been completed successfully.
bit 0: POW Power control
1 = Turns the I/O card on or puts it into operation.
0 = Turns the I/O card off or puts it into standby. At this time, access to
the memory and I/O of the I/O card is prohibited.
Description o Controls the inserted card.
Related I/O 1F8Eh
I/O 1F8Eh
Name Read card type register
Undocumented
Target PC-9801N, NS, NV, NS/E, NC, NS/T, NL, NS/L, NA, NS/R
PC-98DO+
PC-9801UR, UF, US
Function
[READ]
bit 7: CC1 - CC1,CC2=10: Card connected
CC1,CC2=Other: Card not connected
bit 6: PE - Expansion card is fixed to 0
bit 5: WP
1 = Write protect switch ON
0 = Write protect switch OFF
bit 4: Reserve - Expansion card is fixed to 1
bit 3: Reserve - Expansion card is fixed to 1
bit 2: CC2 - See CC1
bit 1: T1
1 = 3V/5V compatible card
0 = 5V only card
bit 0: T0
1 = I/O card
0 = Expansion RAM card
Explanation o Reads the information of the inserted card.
Related I/O 0F8Eh
I/O 4F8Eh,5F8Eh
Name I/O mapped serial memory
Undocumented
Target NV and later
Explanation u Accesses the I/O mapped serial memory used to save the contents of VRAM
I/O 6F8Eh
Name I/O card DMA channel setting
Undocumented
Target I/O card compatible models (PC-9801NS/T･NL･NS/L･NA･NS/R)
Function
[WRITE]
bit 7: Always 1
bit 6-2: Always 0
bit 1,0: DMA channel used by card
11b = CH3
10b = Do not use DMA
01b = Unknown (undefined?)
00b = CH0
Explanation u Sets the DMA channel used by the I/O card
Related I/O 8E1Eh
I/O 7F8Eh,8F8Eh,9F8Eh,AF8Eh,BF8Eh
Name I/O trap control
Undocumented
Target PC-9801NV･NS/E･NC･NS/T･NL･NS/L･NA･NS/R･P･NX/C･NS/A･NL/R,PC-9821Ne
Explanation o When the CPU accesses an I/O port that cannot be read due to
resume, this function generates an NMI and captures access to the I/O port.
o This I/O is actually used in PC-9801NV･NS/E･NC･NL･NS/L･NA.
o Details unknown.