-
merging bytesPicturing three bytes with their bits identified by letters to make the visualisation easier, what's the best way to perform this transformation? [co…
... br /> [/list]
I am a bit of a 'simple ... br /> ; Breaks: A, D
LD A, H
AND E0h ...
LD H, A
LD A, L
LD L, A
LD A, D
RRCA
RRCA
LD D, A
AND ... -
IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
Sorry but for me writing LD A,(IX) is dirty notation, ... involves using an offset and LD A,(IX+0) just makes ... code. What appeared? At 1 AM I wrote carelessly SUB A ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... /> [/CODE][/QUOTE]
I am at home now, so no ... bc
Ld b,ixh
Ld c,ixl
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
[QUOTE=Dr BEEP;664037]I am at home now, so no ... bc
Ld b,ixh
Ld c,ixl
ld (nn+1), bc
...
nn: ld bc, 0
20 ...Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
[QUOTE=Dr BEEP;664037]I am at home now, so no ... bc
Ld b,ixh
Ld c,ixl
POP IX
LD IXH,B
LD IXL,COptimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... =Crisis;664809]Hello,
I am going to try this routine ... , a
ret nz
ld a, (hl)
inc hl ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... +POP BC
LD BC,x
LD BC,x+PUSH BC ...
2xEX (SP),HL
LD B,B
JR +0 ... instructions...
Honestly, I am not sure whether these findings ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... 't think your version works. Am I missing something?
< ... ; no more bits left?
ld a, (hl) ; load another group ... hl ; store source address
ld l, (hl) ; load offset
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
[QUOTE=jamorski;676696]Am I correct that the last ... (we can avoid the first ld de, $57ff in the rcs ...Is this TZX OK?I'm in the middle of preserving a bunch of Danish MIAs and STPs. I'm slowly getting up to speed with MakeTZX. One tape is giving me some trouble. You…
... 23786
23791 LD IX,35000
23795 LD DE,00021
23842 CALL 01366
23845 LD HL,00000
23848 XOR ... ,39000
23858 LD IX,40000
23862 LD DE,11683
[/code]
Am I to assume that it ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... to the fact that I am experimenting with combined data blocks ... ":
[CODE] org 50000
ld de,64859 ; destination
call ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... a trace of what I am seeing in Fuse's debugger ... #02F2,POWER_UP2
D 02F2 LD A,02
D 02F4 ... (254),A
D 02F6 LD A,#3F
D 02F8 ... (251),A
D 0305 LD HL,#7FFF
D 0308 ... XOR A
D 030C LD DE,65535
D 030F ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... /> PRINT AT s,0;"I am here: ";USR w: PAUSE 5 ... WHERE_AM_I
HERE: ld b,h
ld c,l
ret ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
I am going little off-topic but, ... involving PC register:
LD PC,x [JP x]
PUSH PC & LD PC,x [CALL x or ... ]
POP PC [RET]
LD PC,HL [JP (HL)]
LD HL,PC mnemonic. :sad ...The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... test, you had the LD HL, xxxx and LD BC, yyyy instructions ... so you ended up with 'LD HL, yyyy', as a mixture ... for some, but I am not able to see any ... Z80 has code in the 'ld e,e' instruction handler ... the code for handling the 'ld e,e', meaning that the ...Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
So, it seems I am in the minority when it ... sharing your code. After all, 'LD BC, $FF' is much easier ...A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…
... at the moment where i am using the book i have ... the hex codes for example ld HL=2A (according to the ... zxspin i would just enter ld HL and not need to ...A quick newbish questionI'm reading through 'mastering machine code on your spectrum',as kindly posted by Mr bert on this forum. Correct me if I'm wrong from what i read,bu…
... at the moment where i am using the book i have ... the hex codes for example ld HL=2A (according to the ... zxspin i would just enter ld HL and not need to ...Multiface 3 programming guide anywhere?I'm interested in the tantalising little bit of text at the bottom of my Multiface 3 manual (under the "Using 8K RAM" section): "Please send a SAE…
... when 'returning':
[1:39pm] LD A,(#2006)
[1:39pm ... to the relevant port. I am aware there is a PAL ...pathfindingworking on pathfinding in the game. here is Russian description of Lee's algorithm: [url]http://algolist.manual.ru/games/wavealg.php[/url] "if-then"…
... end of queue:
[CODE]LD (DE), A
INC E ... 't...
Anyway, I am getting kind of tired of ...Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... circumstances, so I am not surprised if some ... = size_t n
ld a,b ; if size_t n ...
loop:
ld e,(hl) ; remember current char ... br /> notfound:
ld hl,0
ret
am certain the code ...Relocation with SDCCI desperately need auto- relocation with SDCC. Something that will compile all of my code using start address 0 and generate relocation table so that…
... ;fetchLitPair
0000 21r00s00 62 ld hl,#_xmem
63 ; genIpush ... /> 0009 FD 4E 00 68 ld c,0 (iy)
000C ... check that out, but I am using a version from last ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... s successors.
I am not with Winston -- I don ... slower because you have to "LD L,n" or "INC L ... z80 code and having a "LD r,(HL++)" would work great ... relative indexed addressing as in "LD r,(IX+r)" in addition ... to "LD r,(IX+n)" would be ...
