-
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... to set up a table of 257 identical ... 3 tstates: read low byte from the interrupt vector.
byte and jump to interrupt routine ... M2: 3 tstates: write high byte and decrement SP.
* ... : 4 tstates: read high byte of 'nnnn' and decrement ... -
need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... it just uses preshifted bytes table (4 kbytes
... /> [code]DRTABL ;precalculated table, needed for left and ... LD HL,DRTABL ;table with preshifted mask bytes ... form: mask byte, sprite byte, mask byte, sprite byte... and so ... -
Calculate screenaddressWho knows where the topic about the fastest screenaddressroutine is? I can't find it in a search.. The fastest routine was to load a large table of …
... to load a large table of all the screenaddresses ... [code]
LD H,250 ; Table 256 * 256 = 64000
... ; first part of lo-byte is X-dependent
... ADD A,(HL) ; Calculate Lo-byte
INC H
... H,(HL) ; Fetch Hi-byte
LD L,A
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... />
; ********************************************
#define DEFB .BYTE
#define DEFW .WORD
table with
ld bc,0FDh ... LD L,A ; Get Hi Byte back, so H now is ...Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... have used a look up table for the char address, and ... assembler instructions
#DEFINE DEFB .BYTE
#DEFINE DEFW .WORD
TABLE WITH
LD BC,0FDH ... /> LD L,A ; GET HI BYTE BACK, SO H NOW IS ...Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... assembler instructions
#DEFINE DEFB .BYTE
#DEFINE DEFW .WORD
TABLE WITH
LD BC,0FDH ... /> LD L,A ; GET HI BYTE BACK, SO H NOW IS ...Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... /> ;ORd with the last byte of the
;tile ... LD A,(DE) ;The leftmost byte of each
OR ... A,(DE) ;The leftmost byte of each background
... /> LD (HL),A ;byte of the previous one.
table
SUB 12
The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…
... next byte in table
ld e,(hl) ; Fetch 'last' byte in table
prbyte ld a,(hl) ; Fetch byte for print ... /> jr prbyte ; Print byte from screen
table defb 13,27,"J ...West Bank: The most pointless high score table everWest Bank is a good little game. I played it and got a score of 25000 odds starting at stage 6, which I thought was quite good. Then as the game ende…
... it to the high score table. Then I looked closer - the ... last entry in the table has a score of 250000 ... on to the high score table ever! It's not that ...Hi-Score tableThe score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the ta…
The score in my game occupies 3 bytes. I want to create a hi-score but I'm not sure of the best way to work out where a new score would fit in the table. Has anyone tackled a problem like this before ?Frost Byte - Game OverVoting time folks go [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^Frost+Byte$&pub=^Mikro%2dGen+Ltd$"]here[/url] vote and return to post …
... .org/infoseek.cgi?regexp=^Frost+Byte$&pub=^Mikro%2dGen+Ltd ...Byte magazinesHi folks, Does anyone have any copies of Byte from 1977 - 1984 I could borrow? - scans would be made for all to use. I'm after the aricles on FORTH…
... anyone have any copies of Byte from
1977 - 1984 I ...ANN: Tipshop updated Sunday, 30 October 2005Sunday 30 October 2005 Crivvens! What an indecently massive load of stuff this month - a veritable feast of tips, maps, POKEs and complete solutions.…
... /> Kobyashi Naru , Lone Wolf - The Mirror of Death ,
Lord of ... /> Bloody , Bodorrio Real , Bug-Eyes , Byte Bitten , Cholo ,
Con-Quest ...Question regarding Manic Miner (Bug Byte) Acquired another Manic Miner (Bug-Byte Release ?(one that has the guy with the beard on cover)) on eBay (part of someones collection) The thing is,…
Acquired another Manic Miner (Bug-Byte Release ?(one that has the ...Method to read byte as binary string rather than dec?Hi all Am fiddling around with the screen buffer and have written a routine to scan the screenbuffer into upper ram and then write it back in upside…
... . If I could read each byte as binary I could have ... an 8 byte buffer to store the 0 ...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…
... contains: doubly linked list, hash table, heap, queue and stack.
byte definitions. Note that the (mask ...Calling ROM routinesFirstly, sorry if this is the wrong forum to post this in, but I wasn?t quite sure under which heading is best fitted. I?m trying to figure out how…
... is stored in the variable table (as detailed here: [url]http ... has to be the encoded byte indicating the variable type?
table?
All my m ...SimCoupe 1.0 released[size=-2](for those of you that don't read CSS)[/size] SimCoupe, the SAM Coup? emulator, has been updated to version 1.0. This major release adds ma…
... ) and timer reset on each byte read
- Fixed accumulation of ... />
- Improved efficiency of contention table lookups [Dave Laundon]
- Improved ...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…
... effects.
It uses table lookups for the screen address ... h to beginning of xpos table
; so now hl=address ... in xpos table
ld a,(hl) ; a = x byte (e ...Tapes from USSR computer "BYTE" ("БАЙТ")I have TZX images of tapes from "BYTE" (on Russian language). If you want to get this images write me on e-mail.
I have TZX images of tapes from "BYTE" (on Russian language). If you want to get this images write me on e-mail.Aggravating problem with screensI've rewritten my Sam C runtime emulator code ( well almost ) to allow me to use my own routines for blitting sprites onto the screen, storing tiles …
... the nibble-per-pixel to byte-per-pixel so I can ... program uses as an allocation table (ALLOCT). After this, the compiler ... ( RST 16 and jump
table vectors only ). Space is set ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... location
; in the streams table to store the
; offset ... ; HL holds address of first byte of
; character map ... ll_lp: ld a,(de) ; read byte at destination
and $f0 ... rr_lp: ld a,(de) ; read byte at destination
and $0f ...Quick method of fixing TAP parity byte?Quick question: are there any DOS/Win32 utilities (or at least, something in C/++ I could compile in Windows) which fix the broken parity byte of the…
... ) which fix the broken parity byte of the blocks in a ... to tell me what the byte should be but that isn ...ANNOUNCE: Jet Set Willy: Party Willy [Special Edition 2007]Today (23rd April) is the third anniversary of the full release of [i]Party Willy[/i], Daniela Hantuchov?'s 24th birthday, Nicole Vaidi?ov?'s 18th bi…
... the Kong-Beast rooms, and mirror the solar beam!
table (33841-33872);
[*]apply ...Ascii TableDear All, Anybody knows where can I find an Ascii Table for the zx? I would like to know which charcaters are for example like carriage return (10?…
Dear All,
Anybody knows where can I find an Ascii Table for the zx?
I would like to know which charcaters are for example like carriage return
(10?)
Thanks in advance.
DevwebclEasy Compare On 2 Byte Register?e.g. HL, BC, DE Has anybody got a really easy way of doing this without comparing each byte seperately? Any maths has no effect on the flags as far a…
e.g. HL, BC, DE
Has anybody got a really easy way of doing this without comparing each byte seperately? Any maths has no effect on the flags as far as I can tell.ANNOUNCE: BASin r14 is up. New SCREEN$ paintbox included.Hi all, Well, I can't sit on this any longer - so I've released it. Let's all get a good testing session going, eh? You can get the new BASin [url=…
... obvious.
Fixed - The Token Table returned the wrong keyword due ... nasty bug in the 5-byte -> Floating point conversion routine ...16-Bit Binary MathsHi, I'm trying to figure a few things out regarding 16-bit maths (SBC HL, ss in particular). regHL is an UInt16 (unsigned 16-bit integer) in my emu…
... 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 ...Team Spectrum needed[url]http://www.retrogamer.net/forum/viewtopic.php?t=11416&postdays=0&postorder=asc&start=0[/url] Looking for a few players for this competition nex…
... and its like a league table kinda thing.
Need ... 'll be held at the Byte Back retro show next year ... show...
[url]http://byte-back.info/[/url]
BASin r14d - Final bugfix for the r14 seriesOk, there's not a great deal to "show" here, as most of the work has been going on "under the hood" so to speak. And there's been a [i]lot[/i] of wor…
... removed.
Fixed - The Token Table tool was showing the wrong ... string.
Fixed - The Token Table now updates itself if your ... ) 5 byte float value inserted. (AOwen)
Fixed - The token table returned ...
