Changes

Programming:Keyboard scanning

No change in size, 20:39, 15 June 2020

Complete keyboard scanning routine slightly optimized

ld d,b ;1

out (c),c ;4

~~ld c,0~~ xor a ;21 out (c),c a ;4

ld bc,#f792 ;3

out (c),c ;4

ld a,#40 ;2

ld c,#4a ;2 4443

loop ld b,d ;1

out (c),a ;4 select line

ld bc,#f782 ;3

out (c),c ;4

ei ;1 8 =~~211~~ 210 microseconds

ret

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