-
tips on optimizing assemblyI wrote a small routine to rotate right a whole screen character line complete with attributes. This is my third ever assembly routine, so I guess i…
... because he was supposed to point out that ... br /> call gethl ; hl = screen address at column 31
ld ... pop hl ; restore column 31 address
ld (hl),a ... ld a,h ; change hl to attribute address
;or $07 ... -
I'm in need of help hereI've been using the 'COMB' and 'TRANSFER' programs on Lerm's Utility D package to convert copy-protected (Speedlock, Alcatraz etc) 48k games onto +3 …
... the start address 25501) and you have to figure out ... addr+2" and RANDOMIZE USR address
The ... (File / POKE val / Start Address to load)
0 16 49152 ... like split it at address 27000, load that file ... first chunk into the screen and do the LDIR ... -
Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... to screen address and
b) write screen data at that char to any address ... screen
; to a memory location of your choise (address ... :
; First get screen address into bc
call ...
; Move src (screen) address into hl
ld l ... -
Getting scr addresses from x and yCould someone please tell me how to calculate the 8 screen addresses corresponding to a character printed in basic at coordinates x and y? For examp…
... ) to screen address and
b) write screen data at that char to any address in ... ;y to a defined address. Is it too complicated to adapt it to transfer ... /> @48K:
I tried to apply your example, but it ... -
My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... code]
16-BIT SCREEN ADDRESS IN BINARY
... ;
; Fades current screen to black ;
;---------------------------------------------------------------;
... -
My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... .
All you need to do do is after performing ... , if the D register (hi-screen address) >= 88, you know that ... -
My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
... ; ;
; Moves the screen address down 1 line ;
; Written ... screen address
sub 32 ; and try to move up by 1 character to ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... there three blocks of screen then, instead of ... br /> [code]
16-BIT SCREEN ADDRESS IN BINARY
==========================
... /> where:
BB = screen block (0-2)
SSS ...
Adding 1 to the screen address in the first block ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... of the way the screen is organized which ... br /> [code]
16-BIT SCREEN ADDRESS IN BINARY
==========================
... /> where:
BB = screen block (0-2)
SSS ...
Adding 1 to the screen address in the first block ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... are amortized down the screen. Eg, in the ... /> [code]
; Adjusts screen address HL to move one pixel down in ... screen.
;
; enter: HL = valid screen address
; exit : Carry = moved off screen ... redraws the listing on screen, the speed of ... -
Reason for strange display layout?I have always wondered if there is any technical reason behind the strange layout of the display file or why did Sinclair choose to do it this way?
... in some cases. Getting new address (one line down) is very ... a window limit of useable screen area to 32x16 attrs (just 2 ... similar principle. Getting any VRAM address from X,Y coordinates could ... now SP has the exact address for fetching the data
Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…
... /> #3D2F address is used for direct access to Betadisk ROM because ... RET there. You push needed address to a stack and jump there ... as usually (jumps to #3Dxx and to RAM will activate/deactivate ... from need to work in terminal software with 80x25 screen).
...Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... this memory block back to the place where Screen$ is stored ( ... command and then copy the screen$ to that address. Copying 6912 bytes would ... the copy goes from the screen to memory. You can poke ... may be able to take your screen$ down to half to a third size ...Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... command and then copy the screen$ to that address. Copying 6912 bytes would ... into DE is the destination address for the copy and the ... the copy goes from the screen to memory. You can poke values ... may be able to take your screen$ down to half to a third size ...Sceen$ helpMost people have used screen$ at some time or another and for me what I want to do is use it or something like it as a start screen before the game p…
... it from that memory locations to back to screen?
[QUOTE ... and then copy the screen$ to that address. Copying 6912 bytes would ... the copy goes from the screen to memory. You can poke ... may be able to take your screen$ down to half to a third ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... some data... if HL points to the data, you can do ... not necessary at all to load the screen address into A (as in ... done directly at the memory address?
Do you save ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... necessary at all to load the screen address into A (as ... done directly at the memory address?
Do ... then it's generally better to do "RR (HL)". It ... only have 1 access to screen memory (which can cause ... that's something to worry about much later :)).New Spectrum HardwareHi all. Well its Friday so it seems as good a time as any (business is a bit slack at the moment) to start up a thread about creating new Spectrum ha…
... other projects.
To be honest I have not ... the money behind him to get that Spectrum modified.< ... br /> I mean to see a Spectrum screen on a 17" ... PC monitor was amazing to say ... I wish I knew his address, to keep in touch but he ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... coordinate)
// s = string to print, can contain:
// ... /> // \x14\xAA set attribute to AA
// \x01 set ... = zx_cyx2saddr(prow, pcol++); // destination screen address for char
if (attr ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... , "2" means to, and "saddr" means screen address (where screen address is an address in the ... a screen address and returns the address of the corresponding attribute square, to which ... with the screen address in hand "disp", the UDG definition to use in ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... screen address
[/code]
but it's alright to mix ... POKE jump instruction at address 0xd4d4 (interrupt service routine ... scroll_isr); // POKE isr address following the jump instruction< ... at address 0xd1d1 that jumps to the ...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... hl, scradd ;point hl to start of screen address
ld a,b ... h ;increment h to pixel line aligned address
dec a ... create a 24 address table with each address representing a 8 ... of test. To use the routine poke address 40000 with the ...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…
... of a DOSbox, much to quick to READ and closing directly, ... is compiled by default to run at address 32768 so you ... page. Instead follow the link to their [URL="http://sourceforge. ... to customize SP1 to non-default values (such as selecting smaller screen area to ...Digitized videos and sounds projectAfter starting this thread [url]http://www.worldofspectrum.org/forums/showthread.php?t=14420[/url] I decided to start converting parts of clips and…
... Instead of saving the converted screen to hd immediately after conversion, there ... the whole screen. It makes no sense to have to have 6144 ... in a buffer for later save, as PUT-Block, Screen (with ... pixel and convert them to same sized screen (which cannot be ...Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…
... I decide to use splib2 to create my image parser to draw lines ... pattern filler code and related screen address manipulators. The buffers that splib2 ... the default address is 32768 which you can change to whatever makes ...Vector drawing routines.Anybody could point me to some sort of vector drawing package of routines, callable from BASIC? With "vector drawing" I mean to draw 2D pictures with…
... /> .up
push hl ; save screen address
call SPPixelUp ; move up ... pixel coordinates to a mask + display address), "SPPixelUp" (modify display address to move up ...Your help needed![FONT=Arial]there are [URL="http://www.worldofspectrum.org/neededscreens.html"]a number of titles[/URL] (146) that still lack an in-game scre…
... that software should allow this screen to be grabbed.
to print anything to the screen. (Nothing to grab). So technically ... it to work. There's something wrong somewhere, because the LOAD address ...The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…
... 74HCT125 tristate buffers to construct a bidirectional buffer for the data ... least 15 dedicated to the W5100's address bus).[/quote]
to buffer all bits in the address and data ... other single signal), you could buffer (and make the signal ...Channel redirectionHi! I need help regarding the following problem. I want a BASIC decoder running on Spectrum, written in assembler. I found the great *LIST routine […
... screen. However, I need the ASCII BASIC listing in a buffer ... think you need to be sending output to any buffer. Can't ... LD HL,(bufindex) ; Get pointer to buffer
LD (HL),A ; ... br /> INC HL ; Point to next buffer location
LD (bufindex ...splib2 from ROMI'm trying to generate IF2 ROM games for ZX Spectrum 16K using z88dk + splib2. So far I've managed to create a new crt0 file and to generate valid RO…
... in each character on the screen.
SPDirtyChars is ... on screen need to be redrawn.
SPTileArray stores the address ... .
... going to have to do some work today will ... covers the entire screen (or area of the screen that splib2 ...
