Programming the BBC Micro by John D. Ferguson, John Gordon, Louie Macari, Peter H.

By John D. Ferguson, John Gordon, Louie Macari, Peter H. Williams

Programming the BBC Micro is a 12-chapter publication that starts with an outline of the BBC microcomputer, its peripheral, and faults. next chapters concentrate on perform in programming, software improvement, pictures, phrases, numbers, sound, bits, bytes, and meeting language. The interfacing, dossier dealing with, and precise description of BBC microcomputer also are proven.

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Extra resources for Programming the BBC Micro

Sample text

1 Mode Graphics Text Colours 0 1 2 3 4 5 6 7 640X256 320X256 160X256 80X32 40X32 2 4 20X32 80X25 16 — 320X256 160X256 — — 40X32 20X32 40X25 40X25 2 2 4 2 * Teletext display M O D E S 3 , 6 a n d 7 a r e text o n l y m o d e s , t h o u g h ' c h u n k y ' p i c t u r e s c a n b e m a d e u p o u t of g r a p h i c s c h a r a c t e r s in m o d e 7. I n all m o d e s a p a r t from m o d e 7 t h e t e x t c h a r a c t e r s c a n b e a l t e r e d by t h e u s e r . While a display m o d e m i g h t have only two colours these can be a n y t w o c o l o u r s , a l t h o u g h after e x e c u t i o n of a M O D E c o m m a n d t h e y will d e f a u l t t o b l a c k a n d w h i t e .

N o w w e e n t e r t h e field of V D U c o m m a n d s t h a t d o n o t h a v e a n y c o u n t e r p a r t in B A S I C . V D U 19 a l l o w s u s to define w h i c h c o l o u r is a s s o c i a t e d w i t h a logical c o l o u r . N o r m a l l y w e h a v e a s s u m e d z e r o is b l a c k , 1 r e d , 2 y e l l o w a n d 3 w h i t e , b u t if w e h a v e a m o d e l A m a c h i n e o r w e w i s h to u s e a four, o r e v e n t w o , c o l o u r m o d e a n d w a n t different c o l o u r s , t h e n w e m i g h t w a n t z e r o to b e b l a c k , 1 to b e g r e e n a n d 2 to b e flashing r e d - c y a n a n d 3 t o b e m a g n e t a .

P r o g r a m w o u l d n o t give o u t t h e c o r r e c t r e s u l t s . L i n e s 2 2 0 a n d 230 should be: 220 R l = ( - B + S Q R ( D ) ) / 2 / A 230 R 2 = ( - B - S Q R ( D ) ) / 2 / A T h e o n l y w a y to c h e c k o u t y o u r p r o g r a m is to t r y it o u t w i t h test d a t a w h e r e y o u k n o w w h a t t h e r e s u l t s s h o u l d b e . Run time errors o c c u r w h e n , for e x a m p l e , y o u h a v e i n s t r u c t e d t h e m a c h i n e to d i v i d e b y z e r o , o r c a l c u l a t e t h e s q u a r e r o o t of a negative n u m b e r , etc.

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