Personal Computer News

28th January 1984
BBC 'Star' FXs Are Revealed

Categories: Letter

 
Author: David Clifton
Published in Personal Computer News #046

BBC 'Star' FXs Are Revealed

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.

David Clifton
Doncaster, S. Yorks

David Clifton