Programming the BBC Micro - download pdf or read online

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

Programming the BBC Micro is a 12-chapter ebook that starts with an outline of the BBC microcomputer, its peripheral, and faults. next chapters specialize in perform in programming, application improvement, photographs, phrases, numbers, sound, bits, bytes, and meeting language. The interfacing, dossier dealing with, and targeted description of BBC microcomputer also are proven.

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B u t t h e X , Y v a r i a b l e s u s e d in T A B a r e n o t t h e X a n d Y u s e d in g r a p h i c s . T h e B B C m i c r o a l l o w s e i t h e r form b y t w o c o m m a n d s w h i c h c o u p l e d w i t h V D U 5 o r u n c o u p l e d V D U 4 c o n t r o l t h e g r a p h i c s a n d text c u r s o r s . T w o p o i n t s n e e d to b e m a d e h e r e , first t h a t w h e n t h e c u r s o r s a r e c o u p l e d t h e n t h e g r a p h i c s c o l o u r , specified b y t h e G C O L c o m m a n d , o v e r r i d e s t h e C O L O U R c o m m a n d .

I n c l u d e d in t h i s text c a n b e a n y of t h e B A S I C c o m m a n d s , w i t h t h e a d d i t i o n of c o n t r o l c o d e s to i n s e r t , for e x a m p l e , R E T U R N s after e a c h c o m m a n d . T h u s if t h e c h a r a c t e r s t r i n g c o r r e s p o n d i n g to L I S T followed b y R E T U R N is s t o r e d u n d e r key 5, t h e n a t a n y s t a g e w h e n t h e k e y b o a r d is b e i n g s c a n n e d , a s i n g l e k e y s t r o k e will list t h e c u r r e n t p r o g r a m .

7. T h e line of c o d e in Fig. J . 7 w a i t s for 1 s e c o n d a n d if n o key is p r e s s e d , t h e n u l l s t r i n g is r e t u r n e d . U s i n g t h e a b o v e f e a t u r e s t h e B B C p r o g r a m m e r h a s t h e a b i l i t y to c o n s t r u c t i n t e r a c t i v e p r o g r a m s fairly easily. Soft k e y s A t t h e t o p of t h e k e y b o a r d a r e t e n r e d u s e r - d e f i n e d k e y s , fßf-f9. T h e y exemplify t h e t h i n k i n g b e h i n d t h i s d e s i g n : to h a n d o v e r m o r e c o n t r o l of t h e m i c r o to t h e u s e r .

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