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== MMU Registers ==
== MMU Registers ==
{| class="wikitable"
{| class="wikitable" style="text-align:center;"
|+
|+
!Address
!Address
Line 67: Line 67:
MMU_SLOT_7          equ       $FFAF               $E000-$FFFF
MMU_SLOT_7          equ       $FFAF               $E000-$FFFF


== Memory Map ==


<nowiki>*</nowiki> MMU_IO_CTRL bits
<nowiki>*</nowiki> $FFA1 has 2 bits:
<nowiki>*</nowiki>    FFA1[0] =
<nowiki>*</nowiki>        1 = Enable internal RAM for segment $FD00-$FDFF.
<nowiki>*</nowiki>        0 = Disable; RAM/FLASH is accessible.
<nowiki>*</nowiki>
<nowiki>*</nowiki>    FFA1[1] =
<nowiki>*</nowiki>        1 = Enable internal RAM for segment $FFF0-$FFFF
<nowiki>*</nowiki>        0 = Disable; RAM/FLASH is accessible.
<nowiki>*</nowiki> When enabled, the areas supersede RAM/flash, but will be disabled by RESET. When the system resets,
<nowiki>*</nowiki> those regions revert to RAM/flash. Also at RESET, the contents of RAM retain the old values until the
<nowiki>*</nowiki> system powers off.
'''NOTE:'''  If you are writing an OS-9 program, use <code>F$MapBlk</code> and <code>F$ClrBlk</code> instead of directly accessing these addresses. NitrOS-9 keeps track of each process' MMU LUT (but only if you use <code>F$MapBlk</code> and <code>F$ClrBlk</code>). Addressing the MMU directly can create unpredictable results.


== Memory Map ==
{|class="wikitable" style="text-align:center;"
|+
!MMU Block
!MMU Page + Sector
!CPU Space
!Absolute [A20:A0]
!WHAT
!MMU Page
|-
|2'b00
|6'b000_000-6'b000_111
|$0000-$1CFF
|$00_0000-$00_FCFF
|RAM
|MMU Page $00 to $07
|-
|2'b00
|6'b000_111
|$1D00-$1DFF
|$00_FD00-$00_FDFF
|256Byte Internal RAM (For OS9 Lvl 2)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E00-$1E1F
|$00_FE00-$00_FE1F
|I/O - System Control [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E20-$1E2F
|$00_FE20-$00_FE2F
|I/O - IRQ Controller [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E30-$1E3F
|$00_FE30-$00_FE3F
|I/O - TIMER [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E40-$1E4F
|$00_FE40-$00_FE4F
|I/O - RTC [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E50-$1E5F
|$00_FE50-$00_FE5F
|I/O - PS2 [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E60-$1E6F
|$00_FE60-$00_FE6F
|I/O - UART [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E70-$1E7F
|$00_FE70-$00_FE7F
|I/O - CODEC [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E80-$1E8F
|$00_FE80-$00_FE8F
|I/O - IEC [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1E90-$1E9F
|$00_FE90-$00_FE9F
|I/O - SDCARD [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1EA0-$1EAF
|$00_FEA0-$00_FEAF
|I/O - MOUSE Ctrl [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1EB0-$1EBF
|$00_FEB0-$00_FEBF
|I/O - VIA0 [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1EC0-$1EDF
|$00_FEC0-$00_FEDF
|I/O - DMA [32 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1EE0-$1EFF
|$00_FEE0-$00_FEFF
|I/O - MATH [32 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1F00-$1F3F
|$00_FF00-$00_FF3F
|TEXT LUT Foreground [64 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1F40-$1F7F
|$00_FF40-$00_FF7F
|TEXT LUT Background [64 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1F80-$1F8F
|$00_FF80-$00_FF8F
|I/O - SNES/NES Control [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1F90-$1F9F
|$00_FF90-$00_FF9F
|I/O - DIP SW [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FA0-$1FAF
|$00_FFA0-$00_FFAF
|MMU Control Registers [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FB0-$1FBF
|$00_FFB0-$00_FFBF
|I/O - VIA1 [16 Bytes] (F256K)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FC0-$1FDF
|$00_FFC0-$00_FFDF
|GRAPH - TinyVICKY Ctrl Reg [16 Bytes]
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FE0-$1FEF
|$00_FFE0-$00_FFEF
|RESERVED
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FF0-$1FF1
|$00_FFF0-$00_FFF1
|Reserved
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FF2-$1FF3
|$00_FFF2-$00_FFF3
|Vector - Software Interrupt 3 (SWI3)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FF4-$1FF5
|$00_FFF4-$00_FFF5
|Vector - Software Interrupt 2 (SWI2)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FF6-$1FF7
|$00_FFF6-$00_FFF7
|Vector - Fast Interrupt Request (FIRQ)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FF8-$1FF9
|$00_FFF8-$00_FFF9
|Vector - Interrupt Request (IRQ)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FFA-$1FFB
|$00_FFFA-$00_FFFB
|Vector - Software Interrupt 1 (SWI1)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FFC-$1FFD
|$00_FFFC-$00_FFFD
|Vector - Non-Maskable Interrupt (NMI)
|Permanent MMU Page $07
|-
|2'b00
|6'b000_111
|$1FFE-$1FFF
|$00_FFFE-$00_FFFF
|Vector - Reset (RESET)
|Permanent MMU Page $07
|-
|2'b00
|6'b001_000-6'b111_111
|$0000-$1FFF
|$01_0000-$07_FFFF
|RAM (448K) (Shared With Vicky)
|MMU Page $08 to $3F
|-
|2'b01
|6'b000_000-6'b111_111
|$0000-$1FFF
|$08_0000-$0F_FFFF
|FLASH (512K)
|MMU Page $40 to $7F
|-
|2'b10
|6'b000_000-6'b011_111
|$0000-$1FFF
|$10_0000-$13_FFFF
|CARTRIDGE(256K) RAM/FLASH
|MMU Page $80 to $9F
|-
|2'b10
|6'b100_000-6'b111_111
|$0000-$1FFF
|$14_0000-$17_FFFF
|RESERVED
|MMU Page $A0 to $BF
|-
|2'b11
|6'b000_000
|$0000-$03FF
|$18_0000-$18_03FF
|GRAPH - GAMMA B
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$0400-$07FF
|$18_0400-$18_07FF
|GRAPH - GAMMA G
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$0800-$0BFF
|$18_0800-$18_0BFF
|GRAPH - GAMMA R
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$0C00-$0FFF
|$18_0C00-$18_0FFF
|GRAPH - MOUSE Graphics
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1000-$10FF
|$18_1000-$18_10FF
|GRAPH - BITMAP Registers
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1100-$11FF
|$18_1100-$18_11FF
|GRAPH - TILE Registers
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1200-$12FF
|$18_1200-$18_12FF
|GRAPH - MISC Registers
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1300-$13FF
|$18_1300-$18_13FF
|GRAPH - SPRITE BANK 0
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1400-$14FF
|$18_1400-$18_14FF
|GRAPH - SPRITE BANK 1
|MMU Page $C0
|-
|2'b11
|6'b000_000
|$1500-$1FFF
|$18_1500-$18_1FFF
|RESERVED
|MMU Page $C0
|-
|2'b11
|6'b000_001
|$0000-$07FF
|$18_2000-$18_27FF
|GRAPH - FONT MEMORY
|MMU Page $C1
|-
|2'b11
|6'b000_001
|$0800-$0BFF
|$18_2800-$18_2BFF
|GRAPH - LUT2
|MMU Page $C1
|-
|2'b11
|6'b000_001
|$0C00-$0FFF
|$18_2C00-$18_2FFF
|GRAPH - LUT3
|MMU Page $C1
|-
|2'b11
|6'b000_001
|$1000-$13FF
|$18_3000-$18_33FF
|GRAPH - LUT0
|MMU Page $C1
|-
|2'b11
|6'b000_001
|$1400-$17FF
|$18_3400-$18_37FF
|GRAPH - LUT1
|MMU Page $C1
|-
|2'b11
|6'b000_001
|$1800-$1FFF
|$18_3800-$18_3FFF
|RESERVED
|MMU Page $C1
|-
|2'b11
|6'b000_010
|$0000-$12BF
|$18_4000-$18_52BF
|GRAPH - TEXT MEMORY (80x60 Max)
|MMU Page $C2
|-
|2'b11
|6'b000_010
|$12C0-$1FFF
|$18_52C0-$18_5FFF
|RESERVED
|MMU Page $C2
|-
|2'b11
|6'b000_011
|$0000-$12BF
|$18_6000-$18_72BF
|GRAPH - COLOR MEMORY (80x60 Max)
|MMU Page $C3
|-
|2'b11
|6'b000_011
|$12C0-$1FFF
|$18_72C0-$18_7FFF
|RESERVED
|MMU Page $C3
|-
|2'b11
|6'b000_100
|$0000-$001F
|$18_8000-$18_801F
|SOUND - SID LEFT
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0080-$009F
|$18_8080-$18_809F
|SOUND - SID MONO
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0100-$011F
|$18_8100-$18_811F
|SOUND - SID RIGHT
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0180
|$18_8180
|SOUND - OPL3 ADDY REG Low (F256K)
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0181
|$18_8181
|SOUND - OPL3 DATA REG (F256K)
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0182
|$18_8182
|SOUND - OPL3 ADDY REG Hi (F256K)
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0200-$0207
|$18_8200-$18_8207
|SOUND - PSG LEFT
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0208-$020F
|$18_8208-$18_820F
|SOUND - PSG MONO
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0210-$0217
|$18_8210-$18_8217
|SOUND - PSG RIGHT
|MMU Page $C4
|-
|2'b11
|6'b000_100
|$0218-$1FFF
|$18_8218-$18_9FFF
|RESERVED
|MMU Page $C4
|-
|2'b11
|6'b000_101-6'b111_111
|$0000-$1FFF
|$18_A000-$1F_FFFF
|NOTHINGNESS - RESERVED
|MMU Page $C5-$FF
|}


== Memory Model ==
== Memory Model ==
[[File:FNX6809-MemoryModel Page 1.png|thumb|430x430px|FNX6809 Memory Model Page 1|none]]
[[File:FNX6809-MemoryModel Page 2.png|none|thumb|430x430px|FNX6809 Memory Model Page 2]]
__FORCETOC__

Latest revision as of 05:29, 16 June 2024

MMU Registers[edit | edit source]

Address R/W Name 7 6 5 4 3 2 1 0
$FFA0 RW MMU_MEM_CTRL - - EDIT_LUT - - ACT_LUT
$FFA1 RW MMU_IO_CTRL - - - - - $FFF0-$FFFF

Enable

$FD00-$FDFF

Enable

There are 4 MLUTs (MMU Lookup Tables).

ACT_LUT these two bits specify which MLUT (0–3) is used to translate CPU bus address to system bus addresses.

EDIT_LUT these two bits will specify which MLUT (0 - 3) is being edited and will appear in memory addresses $FFA8-$FFAF.

These locations are defined in nitros9/defs/f256.d:

MMU_MEM_CTRL    equ       $FFA0

MMU_IO_CTRL        equ       $FFA1

MMU_SLOT_0          equ       $FFA8               $0000-$1FFF

MMU_SLOT_1          equ       $FFA9               $2000-$3FFF

MMU_SLOT_2          equ       $FFAA               $4000-$5FFF

MMU_SLOT_3          equ       $FFAB               $6000-$7FFF

MMU_SLOT_4          equ       $FFAC               $8000-$9FFF

MMU_SLOT_5          equ       $FFAD               $A000-$BFFF

MMU_SLOT_6          equ       $FFAE               $C000-$DFFF

MMU_SLOT_7          equ       $FFAF               $E000-$FFFF


* MMU_IO_CTRL bits

* $FFA1 has 2 bits:

*    FFA1[0] =

*        1 = Enable internal RAM for segment $FD00-$FDFF.

*        0 = Disable; RAM/FLASH is accessible.

*

*    FFA1[1] =

*        1 = Enable internal RAM for segment $FFF0-$FFFF

*        0 = Disable; RAM/FLASH is accessible.

* When enabled, the areas supersede RAM/flash, but will be disabled by RESET. When the system resets,

* those regions revert to RAM/flash. Also at RESET, the contents of RAM retain the old values until the

* system powers off.

NOTE: If you are writing an OS-9 program, use F$MapBlk and F$ClrBlk instead of directly accessing these addresses. NitrOS-9 keeps track of each process' MMU LUT (but only if you use F$MapBlk and F$ClrBlk). Addressing the MMU directly can create unpredictable results.

Memory Map[edit | edit source]

MMU Block MMU Page + Sector CPU Space Absolute [A20:A0] WHAT MMU Page
2'b00 6'b000_000-6'b000_111 $0000-$1CFF $00_0000-$00_FCFF RAM MMU Page $00 to $07
2'b00 6'b000_111 $1D00-$1DFF $00_FD00-$00_FDFF 256Byte Internal RAM (For OS9 Lvl 2) Permanent MMU Page $07
2'b00 6'b000_111 $1E00-$1E1F $00_FE00-$00_FE1F I/O - System Control [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E20-$1E2F $00_FE20-$00_FE2F I/O - IRQ Controller [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E30-$1E3F $00_FE30-$00_FE3F I/O - TIMER [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E40-$1E4F $00_FE40-$00_FE4F I/O - RTC [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E50-$1E5F $00_FE50-$00_FE5F I/O - PS2 [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E60-$1E6F $00_FE60-$00_FE6F I/O - UART [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E70-$1E7F $00_FE70-$00_FE7F I/O - CODEC [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E80-$1E8F $00_FE80-$00_FE8F I/O - IEC [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1E90-$1E9F $00_FE90-$00_FE9F I/O - SDCARD [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1EA0-$1EAF $00_FEA0-$00_FEAF I/O - MOUSE Ctrl [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1EB0-$1EBF $00_FEB0-$00_FEBF I/O - VIA0 [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1EC0-$1EDF $00_FEC0-$00_FEDF I/O - DMA [32 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1EE0-$1EFF $00_FEE0-$00_FEFF I/O - MATH [32 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1F00-$1F3F $00_FF00-$00_FF3F TEXT LUT Foreground [64 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1F40-$1F7F $00_FF40-$00_FF7F TEXT LUT Background [64 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1F80-$1F8F $00_FF80-$00_FF8F I/O - SNES/NES Control [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1F90-$1F9F $00_FF90-$00_FF9F I/O - DIP SW [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1FA0-$1FAF $00_FFA0-$00_FFAF MMU Control Registers [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1FB0-$1FBF $00_FFB0-$00_FFBF I/O - VIA1 [16 Bytes] (F256K) Permanent MMU Page $07
2'b00 6'b000_111 $1FC0-$1FDF $00_FFC0-$00_FFDF GRAPH - TinyVICKY Ctrl Reg [16 Bytes] Permanent MMU Page $07
2'b00 6'b000_111 $1FE0-$1FEF $00_FFE0-$00_FFEF RESERVED Permanent MMU Page $07
2'b00 6'b000_111 $1FF0-$1FF1 $00_FFF0-$00_FFF1 Reserved Permanent MMU Page $07
2'b00 6'b000_111 $1FF2-$1FF3 $00_FFF2-$00_FFF3 Vector - Software Interrupt 3 (SWI3) Permanent MMU Page $07
2'b00 6'b000_111 $1FF4-$1FF5 $00_FFF4-$00_FFF5 Vector - Software Interrupt 2 (SWI2) Permanent MMU Page $07
2'b00 6'b000_111 $1FF6-$1FF7 $00_FFF6-$00_FFF7 Vector - Fast Interrupt Request (FIRQ) Permanent MMU Page $07
2'b00 6'b000_111 $1FF8-$1FF9 $00_FFF8-$00_FFF9 Vector - Interrupt Request (IRQ) Permanent MMU Page $07
2'b00 6'b000_111 $1FFA-$1FFB $00_FFFA-$00_FFFB Vector - Software Interrupt 1 (SWI1) Permanent MMU Page $07
2'b00 6'b000_111 $1FFC-$1FFD $00_FFFC-$00_FFFD Vector - Non-Maskable Interrupt (NMI) Permanent MMU Page $07
2'b00 6'b000_111 $1FFE-$1FFF $00_FFFE-$00_FFFF Vector - Reset (RESET) Permanent MMU Page $07
2'b00 6'b001_000-6'b111_111 $0000-$1FFF $01_0000-$07_FFFF RAM (448K) (Shared With Vicky) MMU Page $08 to $3F
2'b01 6'b000_000-6'b111_111 $0000-$1FFF $08_0000-$0F_FFFF FLASH (512K) MMU Page $40 to $7F
2'b10 6'b000_000-6'b011_111 $0000-$1FFF $10_0000-$13_FFFF CARTRIDGE(256K) RAM/FLASH MMU Page $80 to $9F
2'b10 6'b100_000-6'b111_111 $0000-$1FFF $14_0000-$17_FFFF RESERVED MMU Page $A0 to $BF
2'b11 6'b000_000 $0000-$03FF $18_0000-$18_03FF GRAPH - GAMMA B MMU Page $C0
2'b11 6'b000_000 $0400-$07FF $18_0400-$18_07FF GRAPH - GAMMA G MMU Page $C0
2'b11 6'b000_000 $0800-$0BFF $18_0800-$18_0BFF GRAPH - GAMMA R MMU Page $C0
2'b11 6'b000_000 $0C00-$0FFF $18_0C00-$18_0FFF GRAPH - MOUSE Graphics MMU Page $C0
2'b11 6'b000_000 $1000-$10FF $18_1000-$18_10FF GRAPH - BITMAP Registers MMU Page $C0
2'b11 6'b000_000 $1100-$11FF $18_1100-$18_11FF GRAPH - TILE Registers MMU Page $C0
2'b11 6'b000_000 $1200-$12FF $18_1200-$18_12FF GRAPH - MISC Registers MMU Page $C0
2'b11 6'b000_000 $1300-$13FF $18_1300-$18_13FF GRAPH - SPRITE BANK 0 MMU Page $C0
2'b11 6'b000_000 $1400-$14FF $18_1400-$18_14FF GRAPH - SPRITE BANK 1 MMU Page $C0
2'b11 6'b000_000 $1500-$1FFF $18_1500-$18_1FFF RESERVED MMU Page $C0
2'b11 6'b000_001 $0000-$07FF $18_2000-$18_27FF GRAPH - FONT MEMORY MMU Page $C1
2'b11 6'b000_001 $0800-$0BFF $18_2800-$18_2BFF GRAPH - LUT2 MMU Page $C1
2'b11 6'b000_001 $0C00-$0FFF $18_2C00-$18_2FFF GRAPH - LUT3 MMU Page $C1
2'b11 6'b000_001 $1000-$13FF $18_3000-$18_33FF GRAPH - LUT0 MMU Page $C1
2'b11 6'b000_001 $1400-$17FF $18_3400-$18_37FF GRAPH - LUT1 MMU Page $C1
2'b11 6'b000_001 $1800-$1FFF $18_3800-$18_3FFF RESERVED MMU Page $C1
2'b11 6'b000_010 $0000-$12BF $18_4000-$18_52BF GRAPH - TEXT MEMORY (80x60 Max) MMU Page $C2
2'b11 6'b000_010 $12C0-$1FFF $18_52C0-$18_5FFF RESERVED MMU Page $C2
2'b11 6'b000_011 $0000-$12BF $18_6000-$18_72BF GRAPH - COLOR MEMORY (80x60 Max) MMU Page $C3
2'b11 6'b000_011 $12C0-$1FFF $18_72C0-$18_7FFF RESERVED MMU Page $C3
2'b11 6'b000_100 $0000-$001F $18_8000-$18_801F SOUND - SID LEFT MMU Page $C4
2'b11 6'b000_100 $0080-$009F $18_8080-$18_809F SOUND - SID MONO MMU Page $C4
2'b11 6'b000_100 $0100-$011F $18_8100-$18_811F SOUND - SID RIGHT MMU Page $C4
2'b11 6'b000_100 $0180 $18_8180 SOUND - OPL3 ADDY REG Low (F256K) MMU Page $C4
2'b11 6'b000_100 $0181 $18_8181 SOUND - OPL3 DATA REG (F256K) MMU Page $C4
2'b11 6'b000_100 $0182 $18_8182 SOUND - OPL3 ADDY REG Hi (F256K) MMU Page $C4
2'b11 6'b000_100 $0200-$0207 $18_8200-$18_8207 SOUND - PSG LEFT MMU Page $C4
2'b11 6'b000_100 $0208-$020F $18_8208-$18_820F SOUND - PSG MONO MMU Page $C4
2'b11 6'b000_100 $0210-$0217 $18_8210-$18_8217 SOUND - PSG RIGHT MMU Page $C4
2'b11 6'b000_100 $0218-$1FFF $18_8218-$18_9FFF RESERVED MMU Page $C4
2'b11 6'b000_101-6'b111_111 $0000-$1FFF $18_A000-$1F_FFFF NOTHINGNESS - RESERVED MMU Page $C5-$FF

Memory Model[edit | edit source]

FNX6809 Memory Model Page 1
FNX6809 Memory Model Page 2
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