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Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... could maybe be adapted for screen addressing, or may trigger any ... ;)
Lets say that screen address is composed of:
Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... off the edges of the screen. It is now modified to ... needs hl to contain sprite screen address, and de to contain databyte ...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…
... Move h to beginning of screen address tablw
... h,(hl) ; h now = screen address (left hand column)
ld ... h,(hl) ; h now = screen address (left hand column)
ld ...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…
... /> ; so now hl=address in xpos table
... Move h to beginning of screen address
ld ... set screen
ret ; DE now has proper address for ...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…
... ;= 128, x coord went off screen
ld ( ... if the particle went off screen. This only works sometimes, ...
Also, although computing the screen address from scratch using tables is ... . I think storing the screen address and bitmask of the last ...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…
... /> ; so now hl=address in xpos table
... Move h to beginning of screen address
ld ... set screen
ret ; DE now has proper address for ...Whatcha listening to now?I'm listening to Audioslave's Revelations album. Fantastic work! Belting it at 12 in the night! Neighbours must be going crazy! :lol: Also listening…
... `ll need the speccy`s screen address or summit won`t I ...Whatcha listening to now?I'm listening to Audioslave's Revelations album. Fantastic work! Belting it at 12 in the night! Neighbours must be going crazy! :lol: Also listening…
[QUOTE=CKay]
Oh, and I`ll need the speccy`s screen address or summit won`t I ?
[/QUOTE]
Yep, the channel key is 16384Spectrum Screen Memory MapWhat's the advantage (mistery?) behind ULA's spectrum screen memory interpretation? 6144 bytes divided into 3 blocks, 2048 bytes long. if you want t…
... 256 to the current screen address (or perform an INC ... to "avoid" the odd screen layout, I tend to ... generate a table of screen Y addresses before doing ... your table, and get the screen address with something like:
... the HIBYTE of the address, and the next 256b ...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…
... x) to screen address and
b) write screen data at that ... char to any address in memory ... /> copyudg:
; First get screen address into bc
call getaddr ... br />
; 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…
... (y,x) to screen address and
b) write screen data at that ... char to any address in memory ... &y to a defined address. Is it too complicated to ...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…
... , 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 ;
... ;
; Moves the screen address up 1 line ;
...Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... when you select a memory address, say, 16384, all eight 4116 ... could be caused by faulty row/column address selection in the chip ... logic has failed, the memory address being influenced when you set ...Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... could be caused by faulty row/column address selection in the chip ... logic has failed, the memory address being influenced when you set ...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 increases ...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 increases ...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…
... would be 'shifted' by one pixel to the left.
[/QUOTE ... stored as one byte per pixel row, rather than one byte per ... cause things to scroll one pixel vertically. To scroll things horizontally ... appropriate bank to get any pixel position. I wonder if that ...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…
... at all to load the screen address into A (as in my ... 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…
... at all to load the screen address into A (as in my ... done directly at the memory address?
Do you save ... only have 1 access to screen memory (which can cause slowdown ...Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... need to work with the row/column address sent to the erstwhile ... the SRAM as a discrete address). The idea would be to ...Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
... url]) aiming to decompress SCREEN$s directly into video ... depacked byte, calculate the SCREEN$ line/column by dividing ... incremental method of calculating the SCREEN$ address ordered by columns, and ... data) to decompress the SCREEN$ and after depacking, reorder ...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…
... circles and fills on screen reading from some memory location ... pattern filler code and related screen address manipulators. The buffers that ... ". As always the default address is 32768 which you can ... size for a completely blank screen; for smaller areas you ...another c64 vs. Speccy site...[url]http://c64vsspectrum.com/[/url] 25 years and we are still brawling.. ;)
... good for Z80 handling the screen. This way [B]both[/B ... and vertical movement of current screen address (again, for [B]both[/B ... " and "sprites" on screen. And the initial address calculation in bitmap and ...Flood Fill ConundrumI have written a flood fill alogirithm. It uses the stack, but only with the y axis. It works quite well, but on large polygons it does take a while …
... the initial x,y to screen address calculation).
It is ... fill an arbitrary region on screen. The black fill is several ...Bresenham's line algorithmHelp - I really am struggling to get my head around this algorithm. I don't know why, I coped with Cordic (SIN/COS) and integer divide routines (/10 …
... can support the Timex 512 screen.
[/quote]
... be portable to suit various screen resolutions and calls a ... Personally I would go with screen addresses and mask for plotting ... line pattern stored in the screen address set to draw patterned lines ...ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
... hand filled with scribbled down screen addresses aimlessly trying to work ... byte is located on the screen. I must've lost days ...
Shows you the screen address, attribute address etc.. as pointed to by ...ANN: SpecEmu 2.7Go get it kids! [url]http://homepage.ntlworld.com/mark.woodmass/specemu.html[/url] :p
...
Shows you the screen address, attribute address etc.. as pointed to by ...Changing the way SCREEN$ is loadedThe way the speccy loads in a SCREEN$ is interesting - top two-thirds first, then middle and finally the bottom, which is due to the way the speccy d…
... ld hl, $4000 ; hl = screen address
ld b, 8 ; b ... ; poke to screen
inc hl ; next screen address
dec ... nextline: inc hl ; next screen address
dec c ; decrease ... jr z, bottomscr ; get bottom screen address
ld a ...
