Page 02
Categories:
| Address | Len | Name | Description |
|---|---|---|---|
| 0200 | 2 | USERV | User Vector |
| 0202 | 2 | BRKV | BRK Vector |
| 0204 | 2 | IRQ1V | Interrupt request Vector 1 |
| 0206 | 2 | IRQ2V | Interrupt request Vector 2 |
| 0208 | 2 | CLIV | OSCLI Vector |
| 020A | 2 | BYTEV | OSBYTE Vector |
| 020C | 2 | WORDV | OSWORD Vector |
| 020E | 2 | WRCHV | OSWRCH Vector |
| 0210 | 2 | RDCHV | OSRDCH Vector |
| 0212 | 2 | FILEV | OSFILE Vector |
| 0214 | 2 | ARGSV | OSARGS Vector |
| 0216 | 2 | BGETV | OSBGET Vector |
| 0218 | 2 | BPUTV | OSBPUT Vector |
| 021A | 2 | GBPBV | OSGBPB Vector |
| 021C | 2 | FINDV | OSFIND Vector |
| 021E | 2 | FSCV | File system control entry vector |
| 0220 | 2 | EVNTV | Event interrupt vector |
| 0222 | 2 | UPTV | User print routine vector |
| 0224 | 2 | NETV | Used by ECONET to take control of computer |
| 0226 | 2 | VDUV | Unrecognised VDU23 & PLOT commands |
| 0228 | 2 | KEYV | Full keyboard access |
| 022A | 2 | INSV | Insert into buffer vector |
| 022C | 2 | REMV | Remove from buffer vector |
| 022E | 2 | CNPV | Count/purge buffer vector |
| 0230 | 2 | IND1V | Spare Vector |
| 0232 | 2 | IND2V | Spare Vector |
| 0234 | 2 | IND3V | Spare Vector |
| 0236 | 2 | Start address of OS variables | |
| 0238 | 2 | Address of ROM pointer table | |
| 023A | 2 | Address of ROM information table | |
| 023C | 2 | Address of key translation table | |
| 023E | 2 | Start address of VDU variables | |
| 0240 | 1 | CFS timeout counter | |
| 0241 | 1 | Input source | |
| 0242 | 1 | Keyboard semaphore | |
| 0243 | 1 | Primary OSHWM | |
| 0244 | 1 | Current OSHWM | |
| 0245 | 1 | RS423 mode | |
| 0246 | 1 | Character definition explosion state | |
| 0247 | 1 | Cassette/ROM filing system switch | |
| 0248 | 1 | RAM copy of ULA control reg | |
| 0249 | 1 | RAM copy of ULA palette reg | |
| 024A | 1 | ROM number active at last BRK | |
| 024B | 1 | ROM number containing BASIC | |
| 024C | 1 | Current ADC channel | |
| 024D | 1 | Max ADC channel | |
| 024E | 1 | ADC conversion type | |
| 024F | 1 | RS423 user flag | |
| 0250 | 1 | RS423 control flag | |
| 0251 | 1 | Flashing colours counter | |
| 0252 | 1 | Mark period counter | |
| 0253 | 1 | Space period counter | |
| 0254 | 1 | Keyboard auto-repeat delay | |
| 0255 | 1 | Keyboard auto-repeat period | |
| 0256 | 1 | *EXEC file handle | |
| 0257 | 1 | *SPOOL file handle | |
| 0258 | 1 | ESCAPE/BREAK effect | |
| 0259 | 1 | ECONET keyboard disable | |
| 025A | 1 | Keyboard status | |
| 025B | 1 | RS423 handshake extent | |
| 025C | 1 | RS423 input supression flag | |
| 025D | 1 | RS423/cassette selection flag | |
| 025E | 1 | Econet OS call interception status | |
| 025F | 1 | Econet OSRDCH interception status | |
| 0260 | 1 | Econet OSWRCH interception status | |
| 0261 | 1 | Speech suppression status | |
| 0262 | 1 | Sount suppression status | |
| 0263 | 1 | BELL channel | |
| 0264 | 1 | BELL envelope number/volume | |
| 0265 | 1 | BELL frequency | |
| 0266 | 1 | BELL duration | |
| 0267 | 1 | Startup message & !BOOT options | |
| 0268 | 1 | Length of soft key string | |
| 0269 | 1 | No of lines printed since last page | |
| 026A | 1 | No of items in VDU queue | |
| 026B | 1 | TAB character value | |
| 026C | 1 | ESCAPE character value | |
| 026D | 1 | Character 0xC0 to 0xCF status | |
| 026E | 1 | Character 0xD0 to 0xDF status | |
| 026F | 1 | Character 0xE0 to 0xEF status | |
| 0270 | 1 | Character 0xF0 to 0xFF status | |
| 0271 | 1 | Function key status | |
| 0272 | 1 | SHIFT+Function key status | |
| 0273 | 1 | CTRL+Function key status | |
| 0274 | 1 | CTRL+SHIFT+Function key status | |
| 0275 | 1 | ESCAPE key status | |
| 0276 | 1 | ESCAPE key effect | |
| 0277 | 1 | IRQ bit mask for user 6522 | |
| 0278 | 1 | IRQ bit mask for 6850 | |
| 0279 | 1 | IRQ bit mask for system 6522 | |
| 027A | 1 | Tube presence flag | |
| 027B | 1 | Speech processor presence flag | |
| 027C | 1 | Write character destination status | |
| 027D | 1 | Cursor editing status | |
| 027E | 3 | Unused | |
| 0281 | 1 | Used by *FX1 | |
| 0282 | 1 | RAM copy of serial processor ULA | |
| 0283 | 1 | Timer switch state | |
| 0284 | 1 | Soft key consistancy flag | |
| 0285 | 1 | Printer destination flag | |
| 0286 | 1 | Character ignored by printer | |
| 0287 | 3 | BREAK intercept code | |
| 028A | 2 | Unused | |
| 028C | 1 | Current language ROM number | |
| 028D | 1 | Last BREAK type | |
| 028E | 1 | Available RAM | |
| 028F | 1 | Start up option flag | |
| 0290 | 1 | VDU vertical adjust, set by *TV | |
| 0291 | 1 | Interlace toggle flag, set by *TV | |
| 0292 | 5 | First copy of system clock values | |
| 0297 | 5 | Second copy of system clock values | |
| 029C | 5 | Countdown interval timer value | |
| 02A1 | 16 | Paged ROM type table | |
| 02B1 | 2 | INKEY countdown timer | |
| 02B3 | 3 | OSWORD 0x01 workspace | |
| 02B6 | 4 | Low bytes of most recent analogue converter values | |
| 02BA | 4 | High bytes of most recent analogue converter values | |
| 02BE | 1 | Analogue system flag | |
| 02BF | 10 | Event enable flags | |
| 02C9 | 1 | Soft key expansion pointer | |
| 02CA | 1 | First auto repeat count | |
| 02CB | 3 | Two key rollover processing workspace | |
| 02CE | 1 | Sound semaphore | |
| 02CF | 9 | Buffer busy flags | |
| 02D8 | 9 | Buffer start indices | |
| 02E1 | 9 | Buffer end indices | |
| 02EA | 2 | Block size of current resident block of open cassette input file | |
| 02EC | 1 | Block flag of current resident block of open cassette input file | |
| 02ED | 1 | Last character in currently resident block of open cassette input file | |
| 02EE | 18 | Used as area to build OSFILE control blocks for *LOAD & *SAVE |
Last modified October 6, 2021: Move BBC content into subdirectory to allow more bbc content (23080e8)