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Open and read a file using +3DOS in MCForgive me if this has been asked and answered before, I've spent a fair few hours searching the forums and looking for books on the subject, all wit…
... /> [code]
ld bc,$0302
ld de,100
ld hl,32768
call ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... push de
ld a,(de)
and (hl)
inc hl
or (hl)
ld (de ... hl
ld a,(de)
and (hl)
inc hl
or (hl)
ld (de),a ... hl
ld a,(de)
and (hl)
inc hl
or (… -
number padding functionI wrote a number padding function in BASIC a while ago, but when I came to want it again I couldn't find it, so I've done this enhanced [url=http://w…
... ),de ;STKBOT
ld (23653),de ;STKEND
dec de
ld a,(de)
ex de,hl ;DE ... -
question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…
... ' ; fix
ld (attrt), a ;
pop de
ld hl, (k_cur)
and ... a
sbc hl, de
ld b ... , h
ld ... -
question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…
This routine (48 bytes) provides a BASIC replacement for STR$ which fixes those two bugs; use "FN s$(numeric_expression)" instead of "STR$ numeric_expression". I copied the ROM's method used in CIRCLE & DRAW for checking -1 -
What's going on during a reset?Always wanted to know this. Why does the screen fill with garbage then white lines on black then just a totally black screen? What is happening?
... top value to the HL register
LD L,E ; pair.
;; RAM-FILL
L11DC: LD (HL),$02 ; Load memory with $02 ... - prepare to subtract.
SBC HL,DE ; subtract and add back setting ... -
z88dk vs. sdccI've just read this article (in Spanish) [url]http://www.cpcmania.com/index2.asp?urldest=Docs/Programming/SDCC_vs_z88dk_Comparando_tama%F1o_y_velocid…
... hl
ld c,(hl)
inc hl
ld b,(hl)
ex de,hl
ld ... d,h
ld e ... ,l
inc de
dec bc
ld (hl),a
jp ... -
z88dk vs. sdccI've just read this article (in Spanish) [url]http://www.cpcmania.com/index2.asp?urldest=Docs/Programming/SDCC_vs_z88dk_Comparando_tama%F1o_y_velocid…
... hl
ld c,(hl)
inc hl
ld b,(hl)
ex de,hl
ld ... d,h
ld e ... ,l
inc de
dec bc
ld (hl),a
jp ... -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... /> random: ld hl,$A280 ; xz -> yw
ld de,$C0DE ; ... yw -> zt
ld (random+1),de ; ... w = t
ld (random+4),hl
ret
DE.HL as a number. ... -
FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... sbc hl,de ;carry will be always zero before this instruction
ld ... />
pop hl
ld sp,hl ;restore old stack (HL,DE pushed before calling ...
