I have discovered that it is possible to find the value of certain *FXs by PEEKing into the Operating System workspace on my BBC. As it is not possible to enter PRINT *FX 144 etc I have compiled a list of the *FXs, and their effect.
*FX
Dec addr
Effect
4
637
Disable cursor keys
5
645
Select printer type
6
646
Set printer ignore character
9
595
Set flash period of first colour
10
594
Set flash period of second colour
11
596
Set auto-repeat delay
12
597
Set auto-repeat period
16
589
Select number of ADC channels
144
656
Same as *TV
210
610
Turn off all sound
230
630
Enable/disable escape key
231
631
Enable/disable 6522 IRQ
232
632
Enable/disable 6850 ACIA IRQ
As well as being PEEKed at, these addresses can also be POKEd. The addresses above apply to OS>1.0, and OS 0.1 may well be different.
28th January 1984
