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Weird loaders; 1) Why? 2) How? (Curiosity question)Hello again. Sorry to be asking/posting so much today, but I've just arrived here and am plumbing the depths of nearly 22 years of making cups of te…
... RAM.
2) Fix up absolute jumps.
3) Change timing constants ... -
Machine Code: quicksort optimisationI came across this z80 quicksort implementation when going through the wikipedia article on the same. It's 44 bytes long. I was wondering if any of …
... /> As for optimizations, replacing all absolute jumps with relative ones will save ... -
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... branch is NOT taken, where absolute jumps always take the same time ... -
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…
... - are slightly more expensive than absolute jumps - JP xx - because the jump ... and execution continues as normal. Jumps with no condition take a ... -
ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…
... ]
Accepting this, produces absolute jumps:
[IMG]http://www ... -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
I wonder if you could emulate a Speccy on an Amstrad? Would it just be a case of loading the ROM into memory and fixing absolute jumps? -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
... ROM into memory and fixing absolute jumps?[/quote]
I don't ... -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
... ROM into memory and fixing absolute jumps?[/quote]
I don't ... -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
... ROM into memory and fixing absolute jumps?[/quote]
I don't ... -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
... ROM into memory and fixing absolute jumps?[/quote]
I don't ... -
A Spectrum emulator for the C64Recently I found this, a emulator that runs ZX Spectrum BASIC on a Commodore 64. It was made in 1985. I remember reading about it in a magazine. Curi…
... ROM into memory and fixing absolute jumps?[/quote]
Well, I ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... all other relative and absolute jumps, and conditional jumps too. Also self modifying ... -
Optimized (in size) Z80 simulatorI am evaluating Z80 simulators to try to create a tool to analyse z80 programs. I'd like to start with a simple register coverage tool and t-state cy…
... all other relative and absolute jumps, and conditional jumps too. Also self modifying ... -
Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... , all unconditional relative jumps could be replaced with absolute jumps, but the net ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... JIT where you trap all jumps and redirect them to ... I could rewire absolute jumps (I'd leave relative jumps intact) to ... can add this difference to absolute address.
In ... , the problem is detecting absolute jumps that are in fact relative ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... code which didn't use absolute jumps at all and function pointer ... -
Spectrum Machine Language For The Absolute BeginnerI'm selling a copy of the Melbourne House book "Spectrum Machine Language For The Absolute Beginner" by William Tang, and was wondering if anyone on …
... "Spectrum Machine Language For The Absolute Beginner" by William Tang, and ... -
Spectrum Machine Language for the Absolute Beginner"Spectrum Machine Language for the Absolute Beginner" by William Tang (he of Horace fame). One careful owner, only used it on Sundays to get to churc…
"Spectrum Machine Language for the Absolute Beginner" by William Tang (he of Horace fame). One careful owner, only used it on Sundays to get to church, etc etc.
[url]http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=8403369267[/url] -
Spectrum Machine Language for the Absolute Beginner (price)[URL="http://www.worldofspectrum.org/infoseekid.cgi?id=2000363&loadpics=3"]Spectrum Machine Language for the Absolute Beginner[/URL] The mag adverts…
... "]Spectrum Machine Language for the Absolute Beginner[/URL]
The ... -
Sinclair C5 on Absolute RadioI don't know if anyone listens to Absolute Radio, but on the breakfast show over the last week they've been talking about and having competitions to …
... know if anyone listens to Absolute Radio, but on the breakfast ... -
Chuckie Egg 2 helpCan anyone help me with Chuckie Egg 2? I've filled up the Milk, Cocoa, & Sugar vats, and have make the motorbike toy and picked it up. But what do …
... of precise timing and and absolute bare minimum of the dithering ... , and the number of mistimed jumps was relatively low. I didn ... -
Jet Set Willy OnlineAnyone playing this at the moment? I'm aiming to be online rest the next hour
... 't match their pixel perfect jumps and it was game over ... the fun comes from talking absolute nonsense to the other players ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... the jumps are still relative. If you use JP, those are absolute ... use these to make conditional jumps, like the [B]JR Z ... -
yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... .
(and stuff about patching absolute addresses in instructions to relocate ... as simple as patching the absolute addresses, loading up SP and ... parameters from the stack. malloc jumps directly into the asm entrypoint ... -
Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... programs is entirely linear. Hence jumps, functions, variable access etc. are ... of the QL was an absolute tragedy that might have been ... -
Z80 Cross-assemblersI need to build some code which contains sets of routines which run at one address but are stored elsewhere. Unfortunately, neither of the assembler…
... bytes, and used for calculating absolute addresses within that section of ... option: use only relative jumps & no absolute addresses / calls to code ... -
ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…
... replacing jr and djnz with jumps. I like the idea of ... piece of code (relative to absolute) with a right-click menu ... -
ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…
... replacing jr and djnz with jumps.
I like the idea ... to 16-bit jumps) with "no", the illegal jumps will be signed ... message and the editor cursor jumps to that line. Refer to ... piece of code (relative to absolute) with a right-click
INC not working as expected in LoopHi, i have been working on this for around 2 weeks now and Ive read myself into a hole. I am trying to increment HL. HL is referencing a display …
... "Spectrum Machine Language for the Absolute Beginner" and the influence of ... if clicked
130 Jumps back to main.
1987-2017Here we are, with our tradional thread about games released thirty years ago, where we can contemplate how bad they have aged, how bad they [i]alread…
... seem to be annoyingly impossible jumps, and sections of getting past ... for change...
An absolute stain compared to the original ...
