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Sprite RotatingI was looking (actually at Everyone's a Wally), and noticed that all the graphics for the main characters are left facing, and two characters wide. …
... 451186]the best way is to use LUT for mirroring ... If you have the code to hand I'd be really ... data
HL Holds screen address where A is to go
....and we are ready to go and put another byte ... them up pre-entry thanks to the wonders of RAM ... -
Sprite RotatingI was looking (actually at Everyone's a Wally), and noticed that all the graphics for the main characters are left facing, and two characters wide. …
... /> HL Holds screen address where A is to go
... ;put valid bits into screen
inc l ... ;next addres in screen
ld a,(de ... /> ;HAVE ONE BIT AT THIS ADDRESS TOO
A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…
... be using both screen buffers to avoid screen flicker. This means ... shifts for the bank 5 screen (address 0x4000) in bank 0, ... actual work to make 'physical world' correspond to administration.[/QUOTE ... external input, not subject to software control (unless the ...Did the average Spectrum programmer really even try?I've been thinking about this recently, I'm always hearing Amstrad, and MSX users moaning about how unfair it was that they got "lazy Spectrum ports"…
... the sprites aren't limited to attribute boundaries in Bubble Bobble and ... they tend to overlap a lot at times ... picture you're going to see major attribute clash problems and it ... that have "attribute clash" even though the CPC screen is a pure ...Did the average Spectrum programmer really even try?I've been thinking about this recently, I'm always hearing Amstrad, and MSX users moaning about how unfair it was that they got "lazy Spectrum ports"…
... the sprites aren't limited to attribute boundaries in Bubble Bobble and ... picture you're going to see major attribute clash problems and ... sprites and then give priority to the characters (having the ... that have "attribute clash" even though the CPC screen is a ...Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... but I have started to learn Z80 machine code ... program is intended to paint the screen black (nothing complex ... FFh in the first screen address i.e. it seems ... br /> secondary, you have to change value in HL register ... you just will write to adress 4000h 1400h times ...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. …
... address, then PEEK that address to get the character at that position on screen ...ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…
... methods of printing to a particular position on the screen (with comments ... them for finding a particular screen address, amongst other things.ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…
... after every byte to allow for the Spectrum screen layout.
< ... UDG System Variable at address 23675. So to print (say) the 2nd ... UDG you need to get the address from 23675, add 8 ... 8 bytes to the screen one at a time incrementing your Screen address MSB ...ccompletly baffeled machine codeHi everyone, BEFORE you ask i have not asked help for loads of problems i have recently now encountered and i figured the problems out myself, hones…
... screen at the correct address. It appears to ... be a Character based screen ... [CODE] ld hl,16384 ;screen address - 1st byte of "character ... hl),a ;write byte to screen
inc de ...SpecBAS (SpecOS's BASIC interpreter) is updated - build 236Build 236 is up at [url]ftp://zxdunny.dyndns.org[/url] New for this release is the beginnings of a proper manual - all commands and functions docume…
... .
I then got to thinking about what the main ... restrictions I would like to see removed from the Spectrum ... way beyond 64K
[*]Screen resolution and attribute clash
[*]Performance
to see the above within a ...DMA interface for ZX Spectrum[url]http://velesoft.speccy.cz/data-gear.htm[/url] This is internal DATA-GEAR interface for any 8-bit computer with Z80CPU. Use Direct Memory Access…
... just copying data from one address to another and incrementing the pointers ... being useful is to have a copy of the screen somewhere in ... memory and use the DMA to copy ... the section of the screen from the ...Help! Reverse engineering a Spectrum game[deleted]
... - Number to string converting routines
09 - A debug screen that displays ... , that is; to trim graphics that exit the screen or display window ... - A fast screen address lookup routine, that is; pixels to display pointer using ...Help! Reverse engineering a Spectrum game[deleted]
... br /> 07 - A fast clear screen routine using the stack if ...
09 - A debug screen that displays the register values ... that is; to trim graphics that exit the screen or display ... A fast screen address lookup routine, that is; pixels to display pointer ...Sprite RoutineI was wondering if anyone could point me in the direction of a really basic example of a per-pixel sprite routine? Preferably commented. The screen …
...
; DE -graphics source, HL- screen position ,B-number of horizontal ... /> LD (HL),A ;copy the to screen
INC DE ;next byte ... /> ;requires HL as screen address
INC H ;go to new line
RET C;going to new screen segment, if e.g h ...Sprite RoutineI was wondering if anyone could point me in the direction of a really basic example of a per-pixel sprite routine? Preferably commented. The screen …
To calculate a screen address I usually take the Y pixel position, swap bits 2 to 0 with bits 5 to 3, shift to left 5 times (to multiply with 32) and add the start of screen (16384 or 49152).Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…
... the DOS program 'Display' to convert some file formats. I ... was stored using three channels to solve memory alignment issues, ... during development that will need to be mirrored in the ... long channel
; > EDI = Screen address
.code
Spectrum 128K RS232 to PC serial cableIf you have read some of my recent posts then you will know that I am eager to link my Spectrum +3 to a PC. This will be done by wiring a standard PC…
... is an option to jump to an address so I can ... bar to be pressed (useful just to test with a screen) ... and starts all over again clearing the screen ... so the screen has to be used to store those ... if some of the screen is corrupt. Cybernoid ...SAM programmingHi Can anyone provide any example hello world or graphics/sprite printing style machine code routines for the SAM? I can't seem to find anything rem…
... , it seems to set the vmpr to the lmpr or ... vice versa, so I get my screen address ... working. (I want the screen at 0, a buffer at ... br /> .
What I want to know is which actual page ... By default is the screen pointer set to page 30?
< ...Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... processed during address decode... you could use it to your advantage ... br />
Application screen capture routine to real-time create Run ... /> imul ebx,VRAM ; Calc address
add eax,ebx
to keep the screen updates to a minimum. Why ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... test code to print numbers and text to the screen:
...
; Printing test to the screen.
start ... a,2 ; Open channel 2 (screen)
call CHAN_OPEN
... 0 ; Set to zero
ld hl,16384 ; Screen address
call ...Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... bytes of game data into screen area to make room for the ... the stack is used to store the return address for 48K .SNA ... area could be minimised to 23976 with the screen display being compressed ... the filename will corrupt the screen.
CYBER1: 16384 ...Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... executables without corrupting the screen or any other areas ... /> pack_snapshot: mov edx,[input_buffer_ptr] ; Screen
add edx,SNA_listlen
add ebx,6912 ; Screen
mov edi ... stack holding the return address to jump start the game. ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
...
It's best to stick to zilog's standard mnemonics rather ... are going to like the binary constants used in screen address calculations ... stuff with the b suffix to indicate binary. This is ... and can vary from assembler to assembler. Assembler authors with ...No ZX ZUMA?Hi guys, Lately my nephew and I argued a little that almost all new modern games are but remixed copy-cats and I could prove it (with reverses to 3D…
... amount of colours and the attribute system will just make that ... big mess. The traditional thing to do in that sort of ... circumstance would be to use patterned balls rather than ... 't think there is sufficient screen resolution to do that justice.No ZX ZUMA?Hi guys, Lately my nephew and I argued a little that almost all new modern games are but remixed copy-cats and I could prove it (with reverses to 3D…
... amount of colours and the attribute system will just make that ... big mess. The traditional thing to do in that sort of ... circumstance would be to use patterned balls rather than ... 't think there is sufficient screen resolution to do that justice.[/QUOTE ...Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…
... no need to use CLEAR for a higher address again. Using ... that all memory from address 32768 to 65535 is reserved for ... I want to safely load a screen in to non-video RAM ... , save it to RAM ... the non-video RAM back to BASIC for use.
...New game Sea Dragon (beta)Hi. Over at zx.pk.ru there is a lot of talk of a new game for spectrum called Sea Dragon. It is a VERY nice underwater side scroller... technically V…
...
Im amazed and delighted to see this game released... Its ... two - different sound engines to adjust music and sound separately ... If you look at the screen shots on that page, you ... the archive page to the above http address, to point users to the source?...Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…
... monoloaders is looking for calls to #3D13 (15635). If the ... ]ld hl,#4000 ;HL - address to load to,
ld de,(#5CF4) ;D ... ) to 16384 starting from the current head position. A loading screen, ... cases, these tend to be operated similarly to what you see in ...Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... , flat/linear bitmap. Larger screen area to change -> more data ... you'd have to update screen and/or attribute data for every ... colors they translate into. Like attribute data, but more complex. ... 'zero' ?mpact on overall screen data size. Palette size is ...
