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Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…
... 's important to start with a good grasp of [b]Spectrum ... be gained most easily through a study of Spectrum BASIC - particularly ... command the Spectrum to "build a wall"; you have to tell ... from a byte, or OR-masks to set certain bits in a byte whilst ... -
Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…
... it doesn't fit in a byte as aesthetically as two nibbles ... -
New (easier) speccy games testI've created a new speccy games test: [url]http://www.sometests.com/tests/Gaming/ZXSpectrumGamesTest_EasierVersion_.html[/url] Again it's 20 questi…
... />
First a few revelations to dispel some ... various games "evolution". A lot of their routines ... you first write a byte out to a port and then ... A,#7E
OUT (#FD),A
IN A,(#FE)
BIT 0,A ... />
Became:
LD A,#7E
CALL ReadKey
New (easier) speccy games testI've created a new speccy games test: [url]http://www.sometests.com/tests/Gaming/ZXSpectrumGamesTest_EasierVersion_.html[/url] Again it's 20 questi…
... have to write out a byte and then read it ... A,#7E
OUT (#FD),A
IN A,(#FE)
BIT 0,A ... br /> The "OUT (#FD),A" is completely superfluous. Why it ... structure of a 3d isometric engine encouraged a generic ... ever come up with a decent keyboard reading ...Starting on machine code - BASIC first?Howdy. If I wanted to start learning machine code for the speccy, from scratch, would you recommend I learn BASIC first or is it entirely possible to…
... Bits 3 and 4 of a byte (leaving all other bits unchanged ... ). I would use a XOR-mask of %00011000. I ... also say that I used a XOR-mask of #18, but ... thinking in hex - it's a translation of binary thought.
Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... is working also. You have a picture so the 5V feed ... tests for certain bits in a byte. Hard to explain so ask ...Faulty +2 Grey :(Hello everyone... i was trying to fix a +2 grey board the other day, i had it for some time now. It gave a black screen (paper and border) with two …
... is working also. You have a picture so the 5V feed ... tests for certain bits in a byte. Hard to explain so ask ... speccys and haven't encountered a faulty memory controller chip, not ...How does the Z80 work internaly?How does the Z80 work internaly, i.e. how does it actually execute a machine code instruction? When it fetches a byte from the memory and finds, for…
... br /> - a latch to store the instruction byte over the ... it an address, get back a byte.
- the ALU, ... binary patterns - single-byte INC instructions are always ... store to get back a byte, and feed that into ... input to a hard-wired 0000 0001 byte, and sets ...Slapfight - slower versionI really like vertical shoot em ups and Slapfight 'on paper' looks to be very good but the bullets are just sooooo damn quick and it totally ruins it…
Well, if you take a normal copy of Slappy and ... the 3 highest bits of a byte set 11100000. They are moved ... upto 3 times so if a bullet for example starts off ...Games with pancakes in them?I want to do some vids for my blog (link in signature) that relate to pancakes for Pancake Day, which this year is on the 5th of Feb. Anyone know of…
type 'flip a pancake' into all the text adventures. if it doesn't come up with anything you at least get something to write about in your blog.Games with pancakes in them?I want to do some vids for my blog (link in signature) that relate to pancakes for Pancake Day, which this year is on the 5th of Feb. Anyone know of…
... the bakery of Everyone's a Wally...[/QUOTE]
Despite ... British pancake isn't really a cake, it's more like ... what the French would call a crepe.
Incidentally, British ... />
[QUOTE=mile;241655]type 'flip a pancake' into all the text ...Games with pancakes in them?I want to do some vids for my blog (link in signature) that relate to pancakes for Pancake Day, which this year is on the 5th of Feb. Anyone know of…
[QUOTE=mile;241655]type 'flip a pancake' into all the text ... me think Seabase Delta has a pancake, you have to cook ...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…
... 5 cycles per byte. This means scrolling a full size display ... per byte or 16*6144 = 98304 cycles for a full ... = 18.03 cycles per byte, which is not bad ... per byte).
[/quote]Does anyone have a link to a list ... to copy a byte, hence 21 cycles per byte not 10. ...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…
[quote=bigjon;250417]Don't we need both to copy a byte, hence 21 cycles per byte not 10.5?[/quote]
Yes, but you are copying 2 bytes with one pair of instruction POP/PUSH, thus 21/2 = 10.5problem 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…
... bit of FRAMES (least significant byte) and using the last ... got a better idea for a fix without resorting to calling a byte ... from ROM?
here's a snapshot:< ...
inc hl
ld a,h
and #3f ; keep ...New oneliners for 2008[INDENT][INDENT][INDENT]Here's my attempt at a first-person-perspective 3d game in one line of BASIC. It's called 'wormhole', and you've got to get t…
... ;254255]
That's a nice 1K 3D maze minigame ... striping came accedentilly. I wanted a green on black print, but ... due to a coding error (I forgot a byte) I got the ... prettier. So in less memory a nicer effect.
If ...New oneliners for 2008[INDENT][INDENT][INDENT]Here's my attempt at a first-person-perspective 3d game in one line of BASIC. It's called 'wormhole', and you've got to get t…
... came accedentilly. I wanted a green on black print, ... but due to a coding error (I forgot a byte) I got ... prettier. So in less memory a nicer effect.
a program, it has happened ... to me a few times too!
...Bandersnatch ... what if.I just watched [strike][U][COLOR="Blue"]Commercial Breaks[/COLOR][/U][/strike] (again :rolleyes: ) and am wondering how it might have changed or revo…
[QUOTE=karingal;260277]1k? Was it worth it?[/QUOTE]
At 1p a byte ... you be the judge.Bandersnatch ... what if.I just watched [strike][U][COLOR="Blue"]Commercial Breaks[/COLOR][/U][/strike] (again :rolleyes: ) and am wondering how it might have changed or revo…
[quote=ZnorXman;260327]At 1p a byte ... you be the judge.[/quote]
cost is irrelevant, would 1k have improved a game[B] that [/B]much?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 …
... bits operands : Use A (accumulator), A, H for two parameters ... (ZX Spectrum ROM uses A DEBC). 2nd operand, when ... CPIR), and the Zero byte can be included within ... other hand, it takes a byte longer than C strings, ... evaluation I've implemented a dynamic memory heap ( ...Another file format description pageDear Forum readers, I'm hosting another description site of ZX-Spectrum emulator file format descriptions, where you may find several file formats i…
... />
You have a field saying WORD: af, but ... description is a bit vague anyway: A BYTE to contain a BIT, inverted ... 0..2 of the BYTE, or 0..2 of ... point.
A short comment about reserved bytes ... see your site become a really good quality resource ...TommyGun 0.9.x updates** Should be available via the utilities page soon! Please be patient :-) ** I'll be posting all future updates in this thread, instead of creating …
... size output ordering
. Added a byte definition value eg. you can ... use .db DEFB DB .byte etc
* Code Editor< ... /> * Code Editor
o Added a Vic20 specific code parser
o Added a splitter so you can resize ...How to convert hex bytes to .. in assembly?I hadn't a clue what to put in the title so..., I have in memory 3 hex bytes #10 #34 #50, e.g.,[code][size=2]#6400 10 , 34 , 50 ; hex 25600 16 , 52 …
... br />
Barring that have a look at RLD and RRD ... to extract a nibble (one decimal digit).
a byte as "AB" then the ... value of the byte stored is "A*16+B". You want ... to get B. Then take "A*16" and multiply that by ...Was Knight Lore Really Written Before Sabre Wulf?Was Knight Lore really written before Sabre Wulf or was this a clever form of self promotion by the Stamper brothers? It was a great piece of journa…
... the various games "evolution". A lot of their routines ... it all before in a previous game. Taking the ... you first write a byte out to a port and then ... A,#7E
OUT (#FD),A
IN A,(#FE)
BIT 0,A ...
Became:
LD A,#7E
CALL ReadKey
Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…
... is powered up for a couple of seconds, do ...
The RAM defaults to a fairly random state (that's ... signal, you typically see a pattern of blue stripes ( ... up means that the byte read by the CPU ... are read simultaneously to form a byte. Usually only 1 chip ...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…
... call the lowest level at a byte-at-a-time? So, if you ... a complete buffer, or does it make a "write a byte" call for each byte ...Ocarina Of Time - 10 years old!I can't believe that ten years have passed since I first played the greatest game ever published. C&VG have published their original review to celeb…
... like my cup of tea, a bit more like [I]Oblivion ... /> farcry = look amazing
flip a coin or buy both.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…
... call the lowest level at a byte-at-a-time?[/QUOTE]
a "write a byte" call for each byte?
[/quote]< ... br />
write() generates a ... will turn it into a single byte at a time write. So ...
