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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 …
... interesting project though, a step up from the ZX Basic compilers ... will be initialized as Unsigned byte
FOR b = 0 to ... the basic compiler (in particular sprite code) but it would require ... -
Overflow Flag QuestionHello all, After a long hiatus (lost all code when my MacBook was stolen) i've gone back to the drawing board and am writing a Z80 emulator in REALb…
I've come up with this (I think way ... sign bit of each passed byte and looking at whether this ...
// We use the following table to work out if there ... /overflow.txt for the above table
// Calculate the sign ... -
Handling RST8 on a +3Well, I've come to that bit of my project that I wasn't really looking forward to (because I don't understand enough about the ZX BASIC ROM) - extend…
... effectively sending a single byte to the channel. In ... INKEY$# removes the first byte (if there's anything ... that contains only a single byte, if you use INKEY ... go, you'll end up blocking. Reading the entire ... the 0x3FFA/0x3FFD jump table entry points which doesn ... -
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…
... possible of jumping into a table of 256 routines, and obo's ... chips he needed to use up. You can't store m ... -
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…
... think the console only had 256 bytes of internal RAM or ... , both sharing the same byte - to save ONE byte!
But ... instruction or something, thus using up the byte somewhere else. I did ... just realised, the extra byte used up would be in ROM, which ... -
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…
... think the console only had 256 bytes of internal RAM or ... instruction or something, thus using up the byte somewhere else. I did ... just realised, the extra byte used up would be in ROM, which ... . These can be extended to 256 bytes and 32K respectively by ... -
Lerm Transpack 3 - Microdrive versionListed on [URL="http://cgi.ebay.com/Sinclair-Spectrum-MicroDrive-Cassette-Lerm-TPack3_W0QQitemZ320294319441QQihZ011QQcategoryZ11994QQssPageNameZWDVWQ…
... to see my crap turn up. But that's OK, I ... read all the way to 256 in 4 chunks, or is ... sector headers and creates a table of the sectors that need ... the stage of processing the table, but need to optimise a ... -
Retro-X Alpha availableChanges from WIP 7 (Alpha 3) to Alpha 4 ( 1.5.08 - 14.5.08 ). Requested by and help by - in brackets. Bugfixes: * Viewer: o File list not displaye…
... ) and GeForce 6200LE (256 Mb+Turbo Cache up to 768 Mb) with ... screen redraws per second
Sprite: 306 Redraws/sec (Because my ... -
Games disk collection[url]http://homepage.ntlworld.com/mark.woodmass/gamesdisk.zip[/url] There you go. No good to anyone :p I was just testing out a new util of mine and…
... for each game which sets up the starting cylinder, sector, and ... mlz file and the 512 byte binary file into "filelist.txt ... separately. My tape equivalent uses 256 bytes but since a standard ... is always the unpacked 512 byte bin file immediately afterwards on ... -
Bouncing BallsPfrrt, I am back from lunch, playing the first raw version of BOUNCING BALLS It is very addictive! As stated here [URL]http://www.worldofspectru…
... squaring can be done with table look-up. There should be no ... radius 87.
So a table should look like this
defw 16
....
defw 256
defw 289
defw ... -
I just learnt that Spectrum has 1kB of unused ROMWell, man learns through all his life. I have just discovered that Spectrum has over 1 kilobyte of unused ROM memory, from address 14446 to 15615. Al…
... bytes as an interrupt vector table, in IM 2 mode.
byte zero of the standard ROM ... />
Neat. I always set up a full table -
12-pixel-wide font on 512x192 screenThanks to Geoff I have a working prototype for displaying this font in BASIC. Machine code to follow.
... characters which probably will end up consuming a fair few T ... means of a short lookup table. The fragments of the character ... OR'd into the appropriate byte in the frame buffer.
Question about digitized sound and videoI searched the forums and couldn't find the answer, so here it goes. Regarding digitized sound: I remember reading an article long ago about a vid…
... ought to clean it up and put what I' ... issue by placing a 512-byte header at the start ... comments about "the LDI jump table trick", so it looks ... last time this topic came up, my eventual plan would ... screen writes, to fill up whatever processor time is left ...Game engine design, graphic format?Having never written a game engine before, I'm in need of a little advice on the best way to store the game map. Its 512 x 896 map, 4-way scrolling,…
... 32*56 map, reading each byte of the map and checking ... I'm using a 384 byte lookup table for the screen. Once ... making mistakes, have to be up in a few hours, best ...Screen access in assemblerI am again troubled by the unusal screen design of the Spectrum. :) If I want to do something with, say, a 16x16 bit block of the screen (in the sam…
... ]
If you'll align table on 256 bytes boundary and make it ... 512 bytes long, with 256 LSB first (192 actual and ... 64 dummy values) and 256 HSB next, you could fetch ... /> [code] ld h, HSB of table address
ld l, Y ...Retro-X Alpha availableChanges from WIP 7 (Alpha 3) to Alpha 4 ( 1.5.08 - 14.5.08 ). Requested by and help by - in brackets. Bugfixes: * Viewer: o File list not displaye…
... screen. Allowing 200% messes anything up. I also do not want ... ]
Importer says 'Needs 6912 Byte' instead of 'Bytes"
[/ ... wise, as the objects are byte-oriented. Especialy colour tiles can ... , you will be able to align Objects pixelwise and much much ...BASin r14c - maintenance releaseAfter the recent discussions, BASin has been released as version 14c. It's only a maintenance release, and some of the really big new features are un…
... seconds of emulation. This speeds up Watches quite dramatically.
Fixed ... editor will no longer lock up if you insert either ... 5 byte float value inserted. (AOwen)
Fixed - The token table returned ... a shitload of nightshifts coming up, so I'll have ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... give offset to screenbase (16384/256)
LD H,A ... byte
LD H,A; effectively multiply result by 256 ... byte
PUSH HL
LD A,E ; save the sprite ... /> POP HL ; retrieve pointer screen byte
OR (HL) ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... give offset to screenbase (16384/256)
LD H,A ... byte
LD H,A; effectively multiply result by 256 ... byte
PUSH HL
LD A,E ; save the sprite ... /> POP HL ; retrieve pointer screen byte
XOR (HL ...ZXSpectrum +3 - New SoftwareHello, This is my first post here on WOS, i'm very glad to be here and be a part of this community. To make this short, i've been programming on the…
... block numbers. If there are up to 256 blocks (as on a ... /head/sector values. The 'sidedness' byte of the XDPB is 81h ... remainder 0, so we end up reading cylinder 47 head 0 ...I've been wondering...The Spectrum, CPC, and Apple II had no hardware sprites, so what were those 2D objects in their games?
... follow however that an Hardware Sprite Engine is a bad thing ... actually think the TI-99 sprite engine was quiet interesting for ... the box, it only has 256 bytes (yes bytes!) of CPU ... memory is PORT accessed, a byte a time.
The ...ANNOUNCE: JSW64: Flash Manic MinerI am delighted to announce the gamma-release of [b][i]JSW64: Flash Manic Miner[/i][/b], which is available as a free download from [url]http://geocit…
... have moved the horizontal guardians up one cell-row, chopping ... edition to a sprite that resembles the Bug-Byte logo much more ... and allowing you to jump up to the portal after collecting ... guardians and their sprites, tightened up the difficult jumps, and ...What to write next...?Having not being blessed/cursed with such a mad & rampant imagination as Mr. Cauldwell I'm always after ideas for new spectrum games to write. It's …
... Wolfenstein for example, it is sprite-based & always faces you ... combined with a shoot'em-up. If ten monsters start running ... /> It's still on the table though as a longer term ...Wireframe GraphicsI'm trying to get my head round 3d / wireframe graphics and not really having much luck. I've had a good look on google, but mostly come up with wir…
... to generate a sin/cos table to avoid floating point math ... and speed things up.[/QUOTE]
That won't ... though which will speed things up. If you want to eliminate ... (if not universal) to have 256 degrees in a circle when ...How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …
... 5 Move the pattern byte to the screen address of ...
Increase the pattern table pointer with 1
... Increase the screen address with 256
6 Repeat (5 ... /> ADD HL,BC ;add table offset
LD B, ...Playing 128k music with z88dk ?Hi, I'm amazed how easy seems to make things with z88dk to build spectrum asm programs. After my first approach I miss some way to play 128k music, s…
... project. You would then set up an interrupt routine that calls ... 's one way of setting up an IM2 routine from a ... , 0xd4, 257); // initialize 257-byte im2 vector table with all 0xd4 bytes ...A complete list of 256 colour enhanced games?Hi I was wondering how many Speccy games were enhanced for the color-clash free mode pioneered by Spec256and also suported by Emuzwin? G
... /> I did have the original 256-colour emulator on my PC ... baddies on a screen end up in the same colours. Maybe ... 's up to you which ones you use on the sprite, whether ...New game: Nanako Descends to HellJust a bit over two weeks after their first game, The Mojon Twins strikes again with a new game for Spectrum 128k and Amstrad CPC: [url]http://www.m…
... copy of the IM2 table AND a three-byte JP to ISR ... exposes more details about setting up IM2 mode than the splib2 ... how to create an IM2 table using memset().
You ...New game: Nanako Descends to HellJust a bit over two weeks after their first game, The Mojon Twins strikes again with a new game for Spectrum 128k and Amstrad CPC: [url]http://www.m…
... copy of the IM2 table AND a three-byte JP to ISR ... exposes more details about setting up IM2 mode than the splib2 ...
I copied the jump table, even the generic ISR routine ... () {
// Copies vector table (61440 - 61696)
// Copies generic ...New game: Nanako Descends to HellJust a bit over two weeks after their first game, The Mojon Twins strikes again with a new game for Spectrum 128k and Amstrad CPC: [url]http://www.m…
... 0xf1, 257); // initialize 257-byte im2 vector table with all 0xf1 bytes ... 0xf1, 257); // initialize 257-byte im2 vector table with all 0xf1 bytes ... may be preferable to use up a couple hundred bytes ... each bank rather than use up yet more memory in ...
