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Problem with SPIN assemblerCan anybody tell me why the following machine code program doesn't assemble in the SPIN assembler? ; my first machine code program ld bc, 5 ret Any…
Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…
... to use the register pair BC for parameters, but i have ...Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …
... ; copy bitmap
ld bc,$17e0 ; offset
add ... cp32bytes ; copy attributes
ld bc,$281e ; offset
sbc ... c,a ;
ld ($4728),bc ;
mirror_attributes:
... c,a ;
ld ($6728),bc ;
call zoom_bitmap ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... one address
ld bc,$0005 ; the new channel takes ... one address
ld bc,chan_4 ; could write the bytes ... one address
ld bc,$15c4 ; address of input routine ... the offset
add hl,bc ; the offset is added to ...Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... de,$0000 ; destination
ld bc,$2000 ; length
ldir ... de,$2000 ; destination
ld bc,$2000 ; length
ldir ... ,$18fe ; destination
ld bc,13 ; length
ldir ... de,$0000 ; destination
ld bc,$4000 ; length
ldir ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... to draw
dec bc
push bc
ld ... br /> FadeOutPaper:
push bc
ld c,a ;backup ...How do debuggers guess mnemonicsLet's suppose I have the following numbers in Spectrum memory: Address Byte 30000 1 30001 2 30002 3 30003 4 If I execute in assembler j…
How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
Help hacking Split PersonalitiesI`ve been hacking away at Split Personalities for the purpose of putting new screens and graphics (items). The current screen is at 41187 and is 160…
... /> nop ; 54590 0
inc bc ; 54591 3
ld hl ... /> nop ; 54625 0
inc bc ; 54626 3
ld (33314 ...sound effect code causing crash[FONT=Courier New]I have just written this piece of code to produce a lazer sound effect but for some reason it is causing a crash and I can't figure…
... JR Z,SOUNDOFF
LD BC,65533
LD A,0 ... OUT (C),A
LD BC,49149
LD A,(HL ... LD (LAZERFLAG),A
LD BC,65533
LD A,8 ...A few questions about machine codeOh no... another noob. I'm giving my first steps in assembler (finally, after 20 years stuck in BASIC). I read a SU article explaining that if I wan…
... /> ld hl,24785
ld bc,40832
ldir[/CODE]
bc' sets the amount of bytes ...IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…
... a double register (HL, DE, BC) for zero?
CarlEasy Compare On 2 Byte Register?e.g. HL, BC, DE Has anybody got a really easy way of doing this without comparing each byte seperately? Any maths has no effect on the flags as far a…
e.g. HL, BC, DE
Has anybody got a really easy way of doing this without comparing each byte seperately? Any maths has no effect on the flags as far as I can tell.Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…
AY-player from Rastan SagaHello. For what ports #3F, #5F in the given fragment of a code are used? They give What effect in sounding? ================================= F4C1 21…
... 013FFF [B][COLOR="Red"]ld bc,FF3F[/COLOR][/B]
F4D0 ...Airwolf debuggingI've been trying to fix a couple of things in Airwolf. 1. To pause after death so as to avoid the multiple deaths. As it regenerates the helicopter…
... /> ORG 23760
pause: LD BC,254
IN A,(C ...If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …
... (err_sp),sp
ld bc,0 ; clear bc
ld de,gethook ... /> ret
;
gethook ld bc,($00ec) ; return the address of ... HOOK-CODE in bc register
ret
;[/CODE ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... side to line1
ld bc,$bf00 ;set counter to 191 ... lines
scrlcount
push bc ;save line counter
dontmove ... line road left
pop bc ;recover count for number of ...Understanding extensions to the BASIC parserFor a while, I've had a rather 'rinkety dink' extension to BASIC via an RST 8 trap in hardware, just so that I can send stuff to a Spectrum over ethe…
... work at all for me - BC is set to 0000 regardless ...problem using FRAMES to generate 'random' numbersI realise the pros use bytes from ROM to get their random numbers, presumably because they want to use FRAMES to synchronise the printing and avoid s…
... ,a
contrandommove
push bc ;save no. of moves in ...Need Help with codeHi there, let me preface this by saying I'm NOT an old school computer guy though I do remember using the internet before the WWW and my first comput…
Alternative ROM on original DivIDEOriginal DivIDE interface contain too allram mode (16kB paging). [url]http://raww.org/index.php?name=News&file=article&sid=2471[/url] Switch to ALLR…
... /> LD DE,0
LD BC,16384
LDIR ;rom instalation ...How to read AY Registers from M/C?Gentlemen, I will appreciate if you can provide me some details on this, as I could not find info in other sources. I would like to know if it's pos…
... /> LD D,7
LD BC,ayctrl
OUT (C),D ...
LD BC,aydata
IN A,(C ...DJNZ e ProblemI'm trying to write the DJNZ e instruction as part of the development of my emulator and can't get it to work. Here is the in and out states of Phil…
... :[/u]
AF 0x00
BC 0x0800
PC 0X0000
AF 0x0000
BC 0x0001
PC 0x0004
I end up with BC = 0x0001 and PC = 8. Here ...Integer RangesOK, I need a little help clarifying something. I am making good progress with the emulator so far - I've emulated most ADD, INC, DEC commands (as we…
... -bit integer pairs (e.g. BC, DE, etc) but I represent ...Games sale clean-out...Having a clean-out, and are selling the titles below... PM me if you're interested in any of them. Unsure of any particular prices - make me an off…
128 ROM paging alternativeWould this work (with the appropriate code in each ROM)? [code] ; 128 rom paging routine ; use rst 28h with call address stored after restart ;;rom…
... ) ; get value
ld bc, 0x7ffd ; bc holds port address
di ... ) ; get value
ld bc, 0x7ffd ; bc holds port address
di ...Bresenham's line algorithmHelp - I really am struggling to get my head around this algorithm. I don't know why, I coped with Cordic (SIN/COS) and integer divide routines (/10 …
... Y value ($032A)
LD BC,(real328) ;get back relative X ... /> OR B ;check that both BC & HL 0
OR ... ;preserve HL
SBC HL,BC ;if Y>X then ... next bit
;swap BC/HL to keep X> ... ,A ;swap HL (Y) and BC (X)
gfxdraw2:< ...
