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Simple memory transfer routineI'm looking for a simple memory transfer routine that shifts 32 bytes of data from the address HL is set to 55143, I have tried using LDIR, but cant …
... /> ld hl,51990
ld l,(hl)
ld bc,$0020
ld h,b ...
add hl,hl
ld de,udg-32
add ... hl,de
ld de,55143
ldir
bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
...
BitManipulate:
ld ix,bufferSource
ld iy,bufferTarget
ld h,a ; store top 4 ... /> or h ; merge top and bottom nybbles
ld (iy+0 ... into registers
ld hl,bufferTarget
ld b,(hl)
...Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... [CODE]org $c43e
ld h,a
ld a,l
or ... br /> cp $fe
ld a,h
nop
nop< ... />
org $c461
ld h,a
ld a,l
or ...
org $c481
ld h,a
ld a,l
or ...
org $c4a1
ld h,a
ld a,l
or ...bit manipulation conundrumWhat's a neat way to change this bit pattern in registers BCDE: [code]Loop0: ;change B:00000000 C:abcdefgh D:ijklmnop E:qrstuvwx[/code] to this bit …
... ld d, a ; D: 0mno0p00
ld a, e
rlca
ld h ... , a ; H: rstuvwxq
rlca ... E: 00000vwx
ld a, h
and %01110000 ...Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…
... ;DE=(CHARS)
ld h,0
ld l,a
... /> push de
ld b,8 ;copy char ...
PRINTAB:ld a,(hl)
ld (de),a
ld a,d
add ...IX register - using/problemsAre there any rules on using the IX register? Are there any restrictions on the memory locations that it can access? Yes, I know it's slower than us…
... br />
[code]
ld hx,a ; ld the high 8 bits ... ix with a
ld b,ly ; ld b with the low ... though
[code]
ld hx,ly ; invalid because it ... that can't work
ld h,hx ; invalid because the prefix ...Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... br /> [code]
ld hl, 0
ld d, l
IF ... & %10000000
ld h, 0
ld l, e
ELSE ...
ld hl, 0
ENDIF
ld d, h
[/ ...Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... ; %10000000
ld h, 0
ld l, e
ld d, h
add ...
ELSE
ld hl,0
ld d, h
ENDIF
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... , 0
ELSE
ld h, 0
ld l, e
IF ... [B]!=[/B] 128
ld d, h
ENDIF
IF data ...Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... , 0
ELSE
ld h, 0
ld l, e
IF ... ;& data != 128
ld d, h
ENDIF
multsub %10000000 ...
