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for ARM devices
OS_Byte CMOS Settings
Programmer's Reference Manuals
» Part 15 – SWI Calls
» OS
» OS_Byte
» OS_Byte CMOS Settings
| Value | Hex | Function |
|---|---|---|
| 0 | &00 | Econet station number |
| 1 | &01 | Econet fileserver station number, 0 for name |
| 2 | &02 | Econet fileserver network number/name |
| 3 | &03 | Econet printer server station number, 0 for name |
| 4 | &04 | Econet printer server network number/name |
| 5 | &05 | Default filing system number? |
| 6 | &06 | Unplugged modules byte 0 |
| 7 | &07 | Unplugged modules byte 1 |
| 8 | &08 | Reserved |
| 9 | &09 | More Unplugged modules bits |
| 10 | &0A | Misc mode data? |
| 11 | &0B | Drive/Caps/Mount? |
| 12 | &0C | Keyboard auto-repeat delay |
| 13 | &0D | Keyboard auto-repeat time |
| 14 | &0E | Printer ignore character |
| 15 | &0F | Misc printer/Serial data |
| 16 | &10 | Loud/NoScroll/Boot/Serial format |
| 17 | &11 | NetFiler flags? |
| 18 | &12 | Unplugged modules byte 2 |
| 19 | &13 | Unplugged modules byte 3 |
| 20 | &14 | Unplugged extension modules byte 0 |
| 21 | &15 | Unplugged extension modules byte 1 |
| 22 | &16 | Wimp double click move |
| 23 | &17 | Wimp auto menu delay |
| 24 | &18 | Territory?+ |
| 25 | &19 | Printer buffer size |
| 26 | &1A | ADFS spindown (in 5 seconds) |
| 27 | &1B | Wimp menu drag delay |
| 28 | &1C | Truncate/DragASprite/FilerAction/Dither? |
| 29 | &1D | Mouse type? |
| 30 | &1E | Reserved for the user |
| 31 | &1F | Reserved for the user |
| 32 | &20 | Reserved for the user |
| 33 | &21 | Reserved for the user |
| 34 | &22 | Reserved for the user |
| 35 | &23 | Reserved for the user |
| 36 | &24 | Reserved for the user |
| 37 | &25 | Reserved for the user |
| 38 | &26 | Reserved for the user |
| 39 | &27 | Reserved for the user |
| 40 | &28 | Reserved for the user |
| 41 | &29 | Reserved for the user |
| 42 | &2A | Reserved for the user |
| 43 | &2B | Reserved for the user |
| 44 | &2C | Reserved for the user |
| 45 | &2D | Reserved for the user |
| 46 | &2E | Reserved for applications |
| 47 | &2F | Reserved for applications |
| 48 | &30 | Reserved for applications |
| 49 | &31 | Reserved for applications |
| 50 | &32 | Reserved for applications |
| 51 | &33 | Reserved for applications |
| 52 | &34 | Reserved for applications |
| 53 | &35 | Reserved for applications |
| 54 | &36 | Reserved for applications |
| 55 | &37 | Reserved for applications |
| 56 | &38 | Reserved for applications |
| 57 | &39 | Reserved for applications |
| 58 | &3A | Reserved for applications |
| 59 | &3B | Reserved for applications |
| 60 | &3C | Reserved for expansion cards |
| 61 | &3D | Reserved for expansion cards |
| 62 | &3E | Reserved for expansion cards |
| 63 | &3F | Reserved for expansion cards |
| 64 | &40 | Reserved for expansion cards |
| 65 | &41 | Reserved for expansion cards |
| 66 | &42 | Reserved for expansion cards |
| 67 | &43 | Reserved for expansion cards |
| 68 | &44 | Reserved for expansion cards |
| 69 | &45 | Reserved for expansion cards |
| 70 | &46 | Reserved for expansion cards |
| 71 | &47 | Reserved for expansion cards |
| 72 | &48 | Reserved for expansion cards |
| 73 | &49 | Reserved for expansion cards |
| 74 | &4A | Reserved for expansion cards |
| 75 | &4B | Reserved for expansion cards |
| 76 | &4C | Reserved for expansion cards |
| 77 | &4D | Reserved for expansion cards |
| 78 | &4E | Reserved for expansion cards |
| 79 | &4F | Reserved for expansion cards |
| 80 | &50 | RISC iX and Acorn Access |
| 81 | &51 | RISC iX and Acorn Access |
| 82 | &52 | RISC iX and Acorn Access |
| 83 | &53 | RISC iX and Acorn Access |
| 84 | &54 | RISC iX and Acorn Access |
| 85 | &55 | RISC iX and Acorn Access |
| 86 | &56 | RISC iX and Acorn Access |
| 87 | &57 | RISC iX and Acorn Access |
| 88 | &58 | RISC iX and Acorn Access |
| 89 | &59 | RISC iX and Acorn Access |
| 90 | &5A | RISC iX and Acorn Access |
| 91 | &5B | RISC iX and Acorn Access |
| 92 | &5C | RISC iX and Acorn Access |
| 93 | &5D | RISC iX and Acorn Access |
| 94 | &5E | RISC iX and Acorn Access |
| 95 | &5F | RISC iX and Acorn Access |
| 96 | &60 | RISC iX and Acorn Access |
| 97 | &61 | RISC iX and Acorn Access |
| 98 | &62 | RISC iX and Acorn Access |
| 99 | &63 | RISC iX and Acorn Access |
| 100 | &64 | RISC iX and Acorn Access |
| 101 | &65 | RISC iX and Acorn Access |
| 102 | &66 | RISC iX and Acorn Access |
| 103 | &67 | RISC iX and Acorn Access |
| 104 | &68 | RISC iX and Acorn Access |
| 105 | &69 | RISC iX and Acorn Access |
| 106 | &6A | RISC iX and Acorn Access |
| 107 | &6B | Reserved for RISC iX (Other Unix flavours also use these bytes) |
| 108 | &6C | Reserved for RISC iX (Other Unix flavours also use these bytes) |
| 109 | &6D | Reserved for RISC iX (Other Unix flavours also use these bytes) |
| 110 | &6E | Reserved for RISC iX (Other Unix flavours also use these bytes) |
| 111 | &6F | Reserved for RISC iX (Other Unix flavours also use these bytes) |
| 112 | &70 | Reserved for expansion cards |
| 113 | &71 | Reserved for expansion cards |
| 114 | &72 | Reserved for expansion cards |
| 115 | &73 | Reserved for expansion cards |
| 116 | &74 | Reserved for expansion cards |
| 117 | &75 | Reserved for expansion cards |
| 118 | &76 | Reserved for expansion cards |
| 119 | &77 | Reserved for expansion cards |
| 120 | &78 | Reserved for expansion cards |
| 121 | &79 | Reserved for expansion cards |
| 122 | &7A | Reserved for expansion cards |
| 123 | &7B | Reserved for expansion cards |
| 124 | &7C | Reserved for expansion cards |
| 125 | &7D | Reserved for expansion cards |
| 126 | &7E | Reserved for expansion cards |
| 127 | &7F | Reserved for expansion cards |
| 128 | &80 | Year byte 0 |
| 129 | &81 | Year byte 1 |
| 130 | &82 | More Unplugged module bits |
| 131 | &83 | More Unplugged module bits |
| 132 | &84 | DumpFormat/Misc data? |
| 133 | &85 | Monitor data? |
| 134 | &86 | Font size in 4k units |
| 135 | &87 | Number of ADFS drives? |
| 136 | &88 | Floppy step rates? |
| 137 | &89 | ADFS buffers |
| 138 | &8A | CDFS flags |
| 139 | &8B | Time zone (15 mins as signed) |
| 140 | &8C | NewLook flags? |
| 141 | &8D | More Unplugged module bits |
| 142 | &8E | More Unplugged module bits |
| 143 | &8F | Screen size |
| 144 | &90 | RAMFS size |
| 145 | &91 | System heap size |
| 146 | &92 | RMA size |
| 147 | &93 | Sprite size |
| 148 | &94 | SoundDefault? |
| 149 | &95 | Basic editor flags? |
| 150 | &96 | Basic editor flags? |
| 151 | &97 | Basic editor flags? |
| 152 | &98 | Basic editor flags? |
| 153 | &99 | Econet printer server name bytes 2-16 |
| 154 | &9A | Econet printer server name bytes 2-16 |
| 155 | &9B | Econet printer server name bytes 2-16 |
| 156 | &9C | Econet printer server name bytes 2-16 |
| 157 | &9D | Econet printer server name bytes 2-16 |
| 158 | &9E | Econet fileserver name bytes 2 – 16 |
| 159 | &9F | Econet fileserver name bytes 2 – 16 |
| 160 | &A0 | Econet fileserver name bytes 2 – 16 |
| 161 | &A1 | Econet fileserver name bytes 2 – 16 |
| 162 | &A2 | Econet fileserver name bytes 2 – 16 |
| 163 | &A3 | Econet fileserver name bytes 2 – 16 |
| 164 | &A4 | Econet fileserver name bytes 2 – 16 |
| 165 | &A5 | Econet fileserver name bytes 2 – 16 |
| 166 | &A6 | Econet fileserver name bytes 2 – 16 |
| 167 | &A7 | Econet fileserver name bytes 2 – 16 |
| 168 | &A8 | Econet fileserver name bytes 2 – 16 |
| 169 | &A9 | Econet fileserver name bytes 2 – 16 |
| 170 | &AA | Econet fileserver name bytes 2 – 16 |
| 171 | &AB | Econet fileserver name bytes 2 – 16 |
| 172 | &AC | Econet fileserver name bytes 2 – 16 |
| 173 | &AD | More Unplugged modules bits |
| 174 | &AE | More Unplugged modules bits |
| 175 | &AF | More Unplugged modules bits |
| 176 | &B0 | More Unplugged modules bits |
| 177 | &B1 | Unplug bits for expansion cards 0 – 7 |
| 178 | &B2 | Unplug bits for expansion cards 0 – 7 |
| 179 | &B3 | Unplug bits for expansion cards 0 – 7 |
| 180 | &B4 | Unplug bits for expansion cards 0 – 7 |
| 181 | &B5 | Unplug bits for expansion cards 0 – 7 |
| 182 | &B6 | Unplug bits for expansion cards 0 – 7 |
| 183 | &B7 | Unplug bits for expansion cards 0 – 7 |
| 184 | &B8 | Unplug bits for expansion cards 0 – 7 |
| 185 | &B9 | Language (number of module in ROM entered if boot disabled) |
| 186 | &BA | Country? |
| 187 | &BB | Unplug bits for network card modules |
| 188 | &BC | Blanker/Misc data? |
| 189 | &BD | ADFS disc size 4 |
| 190 | &BE | ADFS disc size 5 |
| 191 | &BF | ADFS disc size 6 |
| 192 | &C0 | ADFS disc size 7 |
| 193 | &C1 | Protection flags? |
| 194 | &C2 | Mouse step |
| 195 | &C3 | Broadcast/Cache/AutoWimp/Misc data? |
| 196 | &C4 | Wimp mode |
| 197 | &C5 | Wimp flags? |
| 198 | &C6 | Filer flags? |
| 199 | &C7 | ADFS directory cache |
| 200 | &C8 | FontMax |
| 201 | &C9 | FontMax1 |
| 202 | &CA | FontMax2 |
| 203 | &CB | FontMax3 |
| 204 | &CC | FontMax4 |
| 205 | &CD | FontMax5 |
| 206 | &CE | FontMax6 (not used) |
| 207 | &CF | FontMax7 (not used) |
| 208 | &D0 | SCSIFS drives? |
| 209 | &D1 | SCSIFS buffers |
| 210 | &D2 | SCSIFS directory cache |
| 211 | &D3 | SCSIFS disc size 0 |
| 212 | &D4 | SCSIFS disc size 1 |
| 213 | &D5 | SCSIFS disc size 2 |
| 214 | &D6 | SCSIFS disc size 3 |
| 215 | &D7 | Reserved (was Auto load applications?) |
| 216 | &D8 | Reserved (was Auto load applications?) |
| 217 | &D9 | More Unplugged modules bytes |
| 218 | &DA | More Unplugged modules bytes |
| 219 | &DB | More Unplugged modules bytes |
| 220 | &DC | Alarm flags/DST? |
| 221 | &DD | Wimp drag click delay |
| 222 | &DE | Wimp drag move delay and iconise widget? |
| 223 | &DF | Wimp double click delay |
| 224 | &E0 | Reserved |
| 225 | &E1 | Reserved |
| 226 | &E2 | Reserved |
| 227 | &E3 | Reserved |
| 228 | &E4 | Reserved |
| 229 | &E5 | Reserved |
| 230 | &E6 | LCD panel brightness / contrast |
| 231 | &E7 | Another Unplugged modules byte |
| 232 | &E8 | Reserved |
| 233 | &E9 | FSLock? |
| 234 | &EA | FSLock? |
| 235 | &EB | FSLock? |
| 236 | &EC | FSLock? |
| 237 | &ED | FSLock? |
| 238 | &EE | FSLock? |
| 239 | &EF | Checksum |
Notes
RISC OS provides 240 bytes of data to be stored in non-volatile memory. Much of the storage is reserved for future use, however, it does provide a method of storing key system configurations such as for expansion cards and so forth.
CMOS usage is subject to change depending on different versions of RISC OS, and applications should not assume the location of any particular byte address.