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0     &00     Display OS version info
1     &01     Write user flag
2     &02     Specify input stream
3     &03     Specify output stream
4     &04     Cursor key status
5     &05     Write printer driver type
6     &06     Write printer ignore char
7     &07     Write RS232 receive rate
8     &08     Write RS232 transmit rate
9     &09     Write duration of first flash colour
10     &0A     Write duration of second flash colour
11     &0B     Write keyboard auto-repeat delay
12     &0C     Write keyboard auto-repeat rate
13     &0D     Disable event
14     &0E     Enable event
15     &0F     Flush buffer
18     &12     Reset function keys
19     &13     Wait for vsync
20     &14     Reset font definitions
21     &15     Flush selected buffer
25     &19     Reset group of font definitions
70     &46     Read/Write country number
71     &47     Read/Write alphabet or keyboard number
106     &6A     Select pointer/Activate mouse
112     &70     Write VDU driver screen bank
113     &71     Write display hardware screen bank
114     &72     Write shadow/non-shadow state
117     &75     Read VDU status
118     &76     Reflect keyboard status in LEDs
120     &78     Write keys pressed information
121     &79     Keyboard scan
122     &7A     Keyboard scan from 16 decimal
124     &7C     Clear escape condition
125     &7D     Set escape condition
126     &7E     Acknowledge escape condition
127     &7F     Check for end of file
128     &80     Read ADC or mouse channel/get buffer status
129     &81     Scan for a particular key
134     &86     Read text cursor position
135     &87     Read char at text cursor, and screen mode
138     &8A     Insert byte into buffer
139     &8B     Write filing system options
143     &8F     Issue module service call
144     &90     Set vertical screen shift, and interlace
145     &91     Get char from buffer
152     &98     Examine buffer status
153     &99     Insert char into input buffer
156     &9C     Read/Write serial port state
160     &A0     Read VDU variable value
161     &A1     Read non volatile CMOS memory
162     &A2     Write non volatile CMOS memory
163     &A3     Read/Write general graphics info
165     &A5     Read output cursor position
176     &B0     50 Hz counter
177     &B1     Read input source
178     &B2     Read/Write keyboard semaphore
181     &B5     Read/Write serial input interpretation status
182     &B6     Read/Write NoIgnore state
191     &BF     Read/Write RS423 busy flag
192     &C0     Read serial port state
193     &C1     Read/Write flash counter
194     &C2     Read duration of second flash colour
195     &C3     Read duration of first flash colour
196     &C4     Read/Write keyboard auto-repeat delay
197     &C5     Read/Write keyboard auto-repeat rate
198     &C6     Read/Write *Exec file handle
199     &C7     Read/Write *Spool file handle
200     &C8     Read/Write Break and Escape effect
201     &C9     Read/Write keyboard disable flag
202     &CA     Read/Write keyboard status byte
203     &CB     Read/Write serial input buffer minimum space
204     &CC     Read/Write serial ignore flag
211     &D3     Read/Write bell channel
212     &D4     Read/Write bell sound volume
213     &D5     Read/Write bell frequency
214     &D6     Read/Write bell duration
216     &D8     Read/Write length of function key string
217     &D9     Read/Write paged mode line count
218     &DA     Read/Write bytes in VDU queue
219     &DB     Read/Write Tab key code
220     &DC     Read/Write escape character
221     &DD     Read/Write interpretation of input values &C0-&CF
222     &DE     Read/Write interpretation of input values &D0-&DF
223     &DF     Read/Write interpretation of input values &E0-&EF
224     &E0     Read/Write interpretation of input values &F0-&FF
225     &E1     Read/Write function key interpretation
226     &E2     Read/Write Shift Fn interpretation
227     &E3     Read/Write Ctrl Fn interpretation
228     &E4     Read/Write Shift Ctrl Fn interpretation
229     &E5     Read/Write escape key status
230     &E6     Read/Write escape effects
236     &EC     Read/Write character destination status
237     &ED     Read/Write cursor key status
238     &EE     Read/Write numeric keypad interpretation
240     &F0     Read country number
241     &F1     Read/Write user flag
242     &F2     Read serial baud rates
243     &F3     Read timer switch state
245     &F5     Read/Write printer driver type
246     &F6     Read/Write printer ignore character
247     &F7     Read/Write Break key actions
250     &FA     Read VDU driver screen bank number
251     &FB     Read display screen bank number
253     &FD     Read last break type
254     &FE     Set effect of Shift-Ctrl on numeric keypad
255     &FF     Read/Write boot option

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