-
Remainder (Mod) calculationsI've been figuring out how to calculate remainders after integer division by a constant divisor k (A mod k = A % k). I found that for most small di…
... ld c, a
add a, $55
rra
srl a
add a ... : B=(A//9)*4
LD A,B/RRCA/RRCA gives A=A//9
[code]Mod10 rrca
ld c, a
add a, a
rlca ; left ... -
Trouble with Vortex player compiling in sjASMPlusHaving some trouble with compiling the Vortex Player using sjASMplus and I can't understand the root of the problem. The project can be found at: …
... /> LD A,2 ;PT2,ABC,Looped
LD (START+10),A
ld hl ... -
How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... />
LD A,100 ; load the A register (the Z80' ... LD BC,16384 ; BC has 16384
LD A,100 ; A has 100
LD ... (BC),A ; load ... (for instance, to LD A,100 it needs the ... or writes to memory (LD (BC),A) and increases PC. ... -
Shadow of the UnicornI've written a program to run Shadow of the Unicorn on a +2A/+3. Is there anywhere it can be put to be available to anyone wanting to play the game?…
LD A,1 ; any value but zero
AND A ; this will set all ... ????
Give it a try
You must ... AF to 0
LD HL,0
PUSH HL ... -
Calling all coding munkeez...Having spent the last 8 years as a Windows application developer I thought I'd try my hand at a bit of Z80 speccy coding - something I missed out on …
... 8704 bytes to program a full working emulator. ... : Why emulate a Z80 on a Z80, well you ...
LD HL,16384
LD A,(HL)
... must work like this:
LD ... HL,16384
LD A,(HL+higherload) -
Cross compilersAre there any z80 cross compilers out there which will produce spectrum files ready for use? That is to say something which I could copy a load of te…
You might give this a try.....
If ... why don't you write a program
to make ... it a tape-file.
... heart- it will not produce a load error.
After ...
LD IX, STARTADRESS
LD DE,LENGTH
LD A,255
ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
... :
ld hl,MyReader
ld (HD_11),hl
... MyReader:
ld hl,SER_FL
ld a,(hl)
and a
jp ...
inc hl
ld a,(hl)
scf
...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ; compute screenadress
vloop.LD E,A ; position in byte
........PUSH ...
........OR (HL)
........LD (HL),A ; plot the bit
........INC ... /> ........INC H; next screenline
........LD A,H
........AND 7
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... only need to
LD A,E ; bit from plot co ... bit over old screen
LD (HL),A ; put screenbyte on screen ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ; compute screenadress
........LD E,A ; A = nr of bit (0-7 ... , 64, 128)
vloop.LD A,E ; E = set bit
........OR (HL)
........LD (HL),A ; plot the bit
... ........INC H ; next screenline
........LD A,H
........AND 7
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... call to the plottingroutine to a plotroutine that can calculate faster ... />
I.e horizontal
LD A,L ; old x
XOR ...
JR Z,nochange
LD A,(screenadresslow) ; in fact x-pos ...
ADD A,C
SUB L
LD (screenadresslow),A
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ;ld a,(SGNY)
ld d,a
ld a,(deltay)
ld b,a
ld a,(SGNX ... )
ld e,a ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
...
..........JR Z,OVER8
..........LD A,(SCREENPOS+2) ; HIGH BYTE
..........LD D,A ; HIGH TO D
..........LD A,C
..........XOR ... 8
..........LD A,(SCREENPOS+1) ; LOW BYTE
..........LD E,A ; LOW TO ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
...
..........JR Z,OVER8
..........LD A,(SCREENPOS+2) ; HIGH BYTE
..........LD D,A ; HIGH TO D
..........LD A,C
..........XOR ... 8
..........LD A,(SCREENPOS+1) ; LOW BYTE
..........LD E,A ; LOW TO ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> ld hl,0
ld (counter),a
ld a,&xx
ld i,a
ld ... hl,&xx00
ld ... de,&xx01
ld ... --
ld hl,(counter)
ld bc,hl
ret ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... down.
This might be a better way of adding 32 ... l
rlc l
ld a,l
and 240
rlca
rlca
ld l,a
Although it looks ... a bit long winded to me ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> 7 ld h,(hl)
4 ld l,a
7 ld a,(de)
7 or (hl)
7 ld (hl),a ... /> 7 ld h,(hl)
4 ld l,a
7 ld a,(bc)
7 or (hl)
7 ld (hl),a
20 ld ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... /> ld a,d
sub 8
ld d,a
ld a,e
add a ... ,#20
ld e,a
jr nz,filltab
ld a,d ...
add a,8
ld d,a
cp ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... LD b,a ; number of horizontal characters
ld a,(pattern)
ld c,a
ld a ... ,e
loop_ch:
ld ...
ld b,a
ld a,1
line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... ,nexty
ld a,l
add a,32
ld l,a
jr ... c,nexty
ld a,h ...
call pixeladdress
ld b,a
ld a,1
jr z ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
...
ld hl,PtsTab
ld a,#80
lp_mpt1 ld (hl),a
rrca ... ,$+12
ld a,e
add a,#20
ld e,a
jr ...Assembler code from tutorial, problem!I was wondering if anyone could help me decipher this z80 assembler code? ORG 60000 LOAD 60000 EA60 21BCEA LD …
ld a,80h loads acc with the ... (hl) equals 9, then add a,(hl) makes it 89h and ... inc a makes it 8ah, so cp ...machine code basicsWondered if anyone can help me out. I have been playing round with some disassemblers (Zeus). And Machine code loaders. All I want to do is print my…
... message
loop: LD A,(HL)
OR A
RET Z< ... /> message: DEFM "THIS IS A MESSAGE"
DEFB 0
a" = DEFB 22,10,10,"a"
To ...
(main screen) with LD A,2 CALL #1602machine code basicsWondered if anyone can help me out. I have been playing round with some disassemblers (Zeus). And Machine code loaders. All I want to do is print my…
> with LD A,2 CALL #1602
... there.
There is a nice string printing routine at ... 7 set.
It is a good idea to study this ...Best way to codeHi, I've been using Zeus Assembler to code MC programs so far. Nothing fancy just the odd scroll left or animation stuff. Wot I'd like to know is, …
... to make a table:
. LD HL,# ... /> . LD B,0
. LOOP LD (HL),#F1 ... !!
. LD A,#F0
. LD I,A ; point to high ...WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…
...
LD A,#18
OR #F8
OUT (254),A
LD A,#08 ... /> LD A,#18
OUT (254),A
HALT ;wait 20ms
LD A,#08 ...Calling all coding munkeez...Having spent the last 8 years as a Windows application developer I thought I'd try my hand at a bit of Z80 speccy coding - something I missed out on …
... 8704 bytes to program a full working emulator. ... : Why emulate a Z80 on a Z80, well you ...
LD HL,16384
LD A,(HL)
... must work like this:
LD ... HL,16384
LD A,(HL+higherload)[/quote]< ...
