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The need of having a 257-byte table for IM2 routinesThis came from a discussion at the speccy.org forum. I have understood that the reason behind the 257-table for IM 2 routines is due to certain joys…
... the reason behind the 257-table for IM 2 routines is due ... this: is the 257-byte table really needed for [B]new[/B] developments ... 1/4 of kilobyte for the IM2 table, but if space begins ... you sacrifice that table and assume that the low byte will be ... -
hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…
... generate keys for a $(103,6) array using a 256-byte permutation table. How ... do I arrange the entries in the permutation table ... ? As all the data table entries are known in advance ... a lot of them in 256 numbers so trial & ... -
Please test my Manic Miner remake!Thanks to everyone who downloaded my sneak preview of Manic Miner Turbo. Thanks especially to na_th_an who is the only person so far to give feedback…
... ; left table for that (or a 1.75K rotate table and mask it to ... some memory by using a 256 byte mirror table (or generating one as ... : I could compress the graphics for "The Final Barrier" and the ... -
Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... 256 byte lookup tables for mirroring and maybe a 512 byte table for a nibble shifted table for ... allowing sprite movement, maybe 4 ... a standard or some rules for the sprite designers about how they ... -
Mode 2 Tile Editor SourceA Timex Mode 2 Tile Editor incorporating a byte mirror table. The compiled version is available in the CSSCGC 2008 collection from the WoS archive. …
... br /> ; pixel tiles for use with TS2068 display ... screen
; (skip for screen to block)
... screen
; (skip for screen to block)
... br /> ; MIRROR TABLE
; ------------
;
; A 256 byte lookup table to mirror the ... -
zxasm.net facebook group - COMPO #6 – 256 byte game compo – THE RESULTS !!!The results of the last compo are in. All entries include the source code. [img]http://zx-speccy.co.uk/Copy2WebServerData/2016716_12380.png[/img]…
... /2016/07/16/compo-6-256-byte-game-compo-the-results/"]zxasm ... /2016/07/16/compo-6-256-byte-game-compo-the-results/[/url ... -
Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... . There is well-known procedures for this, which are simple and ... speed, you have to use 256-byte aligned table. -
Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... came up with last year for comparison - [URL="http://www.bizzley ... for you. There are 8x256 byte shift tables for the movement and a 256 byte ... mirror table, the ... -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
If anyone wants to be really smart, come up with a PASMO Macro that generates a 256-byte mirror table.
I can imagine resorting to Excel for that, myself. -
hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…
A 256 byte hash table seems ideal for implementation in an emulator or ... emulators already use a hash table to decode the opcodes (Zero ... optimize it to a jump table I've been told), but ... -
I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…
... 256-byte boundary?[/quote]
If someone has created a 256-byte aligned table ... 256-byte aligned data structures so it could only happen for ... have done exactly that for specific cases when sdcc' ... procedure we're specifying for z80asm's reloc file ... -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
... , if every bit needs mirroring. For each bit not set, deduct ... ]
Testing if the byte is $ff or $00 and ... /> Using the 256 byte mirror table takes 333 T-States for an 8x8 character ... -
Head over Heels on the C64Dunno if this' a good place to bring this up :D I've been comparing Head over Heels versions and the C64 version is way inferior, everytime there's…
... only speeded up using a 256 Byte LookUp table. I know it because ... to figure out the correct table contents (Thanks to Wilko Schr ... all games use such a table? -
Head over Heels on the C64Dunno if this' a good place to bring this up :D I've been comparing Head over Heels versions and the C64 version is way inferior, everytime there's…
... only speeded up using a 256 Byte LookUp table. I know it because ... to figure out the correct table contents (Thanks to Wilko Schr ... all games use such a table?[/QUOTE]
By and ... more messy, but a lookup table can be used to make ... -
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 i ... to scale the map correctly for the play area, then i ... less tired.
Thanks for the suggestions and advice. -
Wrong-endian data table?I'm drawing up the memory map for something I'm writing. I'll be using machine code on a byte array of 256 elements, each element consisting of 64 by…
Nope, it's all good on a Spectrum, and is a usual method for storing a pre-shift table for sprite drawing. -
New tool: ZXBOOT.EXE[B]ASM[/B] is proud to present the first release of ZXBOOT.EXE: [url]http://www.4shared.com/file/NP-FVOSf/zxboot__beta_.html[/url] ZXBOOT is a comma…
... br />
; 12 BYTE memory remap table.
copy_tab ... --------------------------------------------------------------------------
; 95 BYTE change table for Spectrum +3/2a ROM.
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... PASMO Macro that generates a 256-byte mirror table.[/QUOTE]
I can ... right place:[code]
REPT 256, x
defb ((x> ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... hl,&4000 ; first display byte
ld de,&57ff ... ; last display byte
ld b,revtab/256
loop:
halt
defs (-$)%256 ; 256-byte align
revtab:
defb & ...Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... SP,$5BFF and use the 256 bytes in the unused area ... Jetset Willy use every single byte of the 48K including System ... 't need a 256 byte interrupt table as the low byte of the interrupt ...Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... 't need a 256 byte interrupt table as the low byte of the interrupt ...Mirroring UDG'sJust wondered is there a quick an easy way of mirroring UDGs (byte values)? i.e. BIN 11110000 becoming 00001111 etc.
The quickest way is to use a pre-calculated 256-byte flip table aligned to a page boundary, like the one at [url="http://pyskool.ca/disassemblies/contact_sam_cruise/asm/32256.html"]32256[/url] in Contact Sam Cruise.mirroring bitsIf I have a string of 1408 bytes, each of which has one bit 'b' set, what's the shortest way of mirroring that string, so that each bit set at positi…
... another solution using a 256-aligned lookup table for mirroring:
[CODE ... ,$bytes
ld d,$lookuptable/256
loop:
ld e ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... a result. SP1 now stands for "Sprite Package #1" in the ... contains: doubly linked list, hash table, heap, queue and stack.< ... or 2- (mask, graph) byte definitions. Note that the (mask,graph) pairs are ... sprite function.
9. Sprites can sit in 256 ...A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... real-time sprite shifting routine for sprites that are one byte wide. It ... />
[code] align hi($)==hi($+8) ? 1 : 256[/code]
256-byte boundary. If that’s ... ;advance to next byte (make sure sprite data is aligned)
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... graphic do you need, with mask? How do you need the ... mask... This can be very interesting!!!!
