-
The 150 pound home computerWe missing out on this still ... I think. I know the PC market has wrecked all chance for any alternatives to ever have a hope but ... what if. :lol:…
... having to do with splitting IX and IY into their 8 ... them as regular 8-bit registers -- have been documented and included ... -
Why the name "8-bit computer"?The Spectrum was called an 8-bit computer, but what does that mean? For modern hardware and operating systems (32 or 64-bit) it seems to be the poss…
... of the PC, SP, IX and IY registers as well as the ... to pair up 8-bit registers, but these instructions are all ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... cont'd
With that part all settled, let's have a look at the UDG fatting up process.
[code]
static uchar doublew_left_helper(uchar bmp)
{
uchar i, res;
// have single byte 76543210 in bmp ... -
8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... (HL) ops
2) Some registers (SP, PC) should be trivially ... apply to the general purpose registers only.
3) Depending on ... support undocumented Z80 op-codes. IX and IY should either be ... -
Sprite Tutorial: Section on Masked Sprites addedLatest installment of my Sprite Graphics Tutorial: [url="http://members.aol.com/derekmsmith1/Spectrum/TUTORIAL.RTF"]http://members.aol.com/derekmsmi…
... I hadn't realised that IX without a displacement is not ... case work fine.
The registers in question are even correctly ... syntax highlighted as 8-bit registers in the spin assembler, so ... -
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…
... carry flag before setting the registers. Now, if I' ... ld a,255
ld ix,16384
ld de, ... ld a,255
ld ix,24576
ld de,22564 ... 't understand why certain registers have to be used ... LoaD - Increment - Repeat. Imagine the registers HL DE etc as variable ... -
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…
... carry flag before setting the registers. Now, if I'm ... ld a,255
ld ix,16384
ld de,6912 ... ld a,255
ld ix,24576
ld de,22564 ... 't understand why certain registers have to be used ... . LDIR LDDR) insist on certain registers being used.
... -
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…
... also try not to use IX and IY. They take more ... HL. When you need more registers you can always use alternate ... -
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…
... more registers you can always use alternate registers[/QUOTE]
IX and ... use as extra 8-bit registers (splitting IX/IY into IXH/IXL ... of these extra 8-bit registers this can be faster ... Their main use as index registers is very convenient outside time ... -
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…
As AA says, the IX / IY registers have their uses, but outside ... use any of the other registers instead. I've just finished ... using the indexed addressing with IX is very handy for that ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... not like the use of IX to index the stack frame ... that reserve the index registers), and what registers are reserved by the ... -
Can anybody recommend a good assembler?I've just downloaded Toni Baker's "Mastering Machine Code on Your ZX Spectrum" from the books archive and I'm hunting for a good speccy z80 compiler.…
[QUOTE=aowen;220737]Pasmo. Available for Windows, Mac and Unix.[/QUOTE]
does pasmo support opcodes for splitted IX/IY registers? -
Can anybody recommend a good assembler?I've just downloaded Toni Baker's "Mastering Machine Code on Your ZX Spectrum" from the books archive and I'm hunting for a good speccy z80 compiler.…
[quote=Fikee;220779]does pasmo support opcodes for splitted IX/IY registers?[/quote]
I'm not sure, but you have made me think..... (just incase I need them).. -
Can anybody recommend a good assembler?I've just downloaded Toni Baker's "Mastering Machine Code on Your ZX Spectrum" from the books archive and I'm hunting for a good speccy z80 compiler.…
... pasmo support opcodes for splitted IX/IY registers?[/QUOTE]
It ... -
Emulator accuracy test?When I first created my emulator it worked fine. But then I found one or two games that had odd quirks. Eventually I found the flag or command that w…
... haven't trashed any other registers, or memory. This would obviously ... just the A and F registers. You could choose to do ... whether the undocumented BIT n,(IX)|r is doing what is ... -
Emulators on the ZX SpectrumHaving released a Spectrum 16K emulator for Spectrum 48/128 machines as part of CCG2008, I was wondering if anybody knows of any emulators which actu…
... freed up the use of IX so I'll try with ... -value (constant jump)
IX = either IX or IY when IY then ... IY is loaded in IX and as IX emulated.
Mainprogram ... AF,AF' ; Back to emulator registers
EXX
JP (IY ... -
Disappearing/appearing effectI remember doing a small routine in BASIC which could be used to cover the attributes section randomly, until all 704 characters were filled with the…
... don't use the index registers. Ever.[/QUOTE]
... I thought about avoiding the IX register (as it is ... I only "set" the IX once and "read" from ... set" B H and D registers and "read from" HL ... future developments so using the IX register (if indeed it ... -
A BASIC compiler projectHi, I started my own BASIC compiler for the ZX Spectrum (and Z80 machines) 3 months ago. It's still in ALPHA stage (when it is mature, I will write …
... />
[QUOTE=Winston;261742]What registers need to be preserved in ... a function?[/QUOTE]
Only IX (the stack frame register). ... pops outs the parameters). IX is used to get the ... local variables (e.g. "IX + 1000"), IX might be also modified temporarily ... -
IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …
... pointer
LD IX,(reloc4+1) ;update IX for load bytes ... DE,$C000
ADD IX,DE ;increase IX again to get over ... /> ;calls RST 10, but preserves registers
PUSH HL
prfile2:
LD A,(IX)
INC IX
CALL saferst10 ;print ... -
VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... , de', af = free registers for multiple use
ix = main decoding routine ... -
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 …
... =i-H
670 LET ix=dx: LET iy=dy
690 LET ix=ddx: LET iy=ddy
720 LET PLOTx=PLOTx+ix
730 IF PLOTx 255 ... ). Note that meanwhile the exchange registers H' and L' are used ... -
Spectrum AssemblyHi All, Thanks for letting me in... lol Over the last couple of days I started playing my spectrum emu again and then I started thinking about lear…
... direct put it in the registers, like LD HL, 16384: ... ld a, (height)
ld ix, lines
ld hl, (y_off ... ex de, hl
add ix, de
nextln: push af ... (x_off)
add a, (ix+2)
ld l, a ... /> ldir
inc ix
inc ix
pop af
what were the things the Speccy architecture was good for?I don't know a hell of a lot about all the different computers hardware and I wanted to know if the way the Spectrum was built lent itself to certain…
... frequency
-6502 has three registers A,X,Y
-Z80 ... banks of AFBCDEHL registers, and two IX,IY index registers
-Z80 ... results in ones of its registers
-Z80 slightly loss in ...Random access, file sizes and more.A few days ago Aowen mentioned that random access to saved data is not a problem. Here are my thoughts, doubts and suggestions regarding this subject…
... /> ; called function must preserve ix and exx registers
;
defc ...Questions about registers, stack, etc.I was told that if I wanted to export code and create unprotected versions of games I should do the following: 1-Find the starting address by using …
... , you don't need the registers until you want to make ... and Start (LD SP, LD IX and DE and usually JP ... original stack pointer and no registers after all.Questions about registers, stack, etc.I was told that if I wanted to export code and create unprotected versions of games I should do the following: 1-Find the starting address by using …
... , you don't need the registers until you want to make ... and Start (LD SP, LD IX and DE and usually JP ... original stack pointer and no registers after all.[/quote]
Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... "function calls" by using IX and IY registers to store return codes ... (b) functions are predefined for IX or IY e.g.
....
; Call function1
LD IX,$+7
JP function1
Why did the QL fail?Browsing some old magazines: an advert appeared for the QL, 128k of ram and 32 bit processor etc...also very cheap compared to other similar spec com…
... , but having 32 bit wide registers.
The Z80 has ... data bus nor 16 bit registers (I would be willing to ... up of two 8 bit registers on the silicon) so everyone ... calls it 8 bit. IX and IY are definitely pairs ...New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... unit, by extending most registers (HL, BC, DE, IX, IY, PC, and ...** New Game In Development **As one or two of you may already know, Jonathan (Joffa) Smith is currently developing a brand new Spectrum game. The program is called 'SAUCER' It'…
... for the larger number of registers. And coming from the Z80 ... across the full set of registers. But it's still sufficiently ... bit of speed and use IX and IY. God alone knows ...
