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An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…
... anyone in the SAM community to write a compiler :( Plus also ... br />
I could print to a backscreen, but am waiting ... , you mean like working out screen address for a pixel and setting ... />
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I want to join the club, do I ... -
Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …
... the screen address one pixel below the given address ? Is it best to use ... metric on which "best" is to be measured.
[quote ... -
Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …
... the screen address one pixel below the given address ? Is it best to use ... :cool:, it is faster to modify the screen address rather than using a ... table or the stack to pop off screen ... -
Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …
... "Routine to generate a Screen Address Table". I had to change the ... inc l to ... l was rolled back to zero it wrote all ... br /> inc l ; Changed to inc hl
ld ( ...
inc l ; Changed to inc hl
... -
Turbo Imploder Anyone clued up on how to use this ? I've managed to pack a few of my own games, but I notice the default start address is always 24576, can you go…
... often have the option to depack to a different address than it was ... loaded at. So, to pack a screen ... /> (If it asks for an address to use as a workspace, keep ... -
how do i read the keyboard in assembly? here is the code i tried writting to find out the value of a key call 28f (hex) loop: ld a,255 cp e jr z loop ld (50000),e ret notes from what i …
... /> Firstly, you should be calling address 028e (hex), or 654 if ... />
Secondly, put the call to the ROM inside the loop ... moveable sprite go around the screen, according to keypress.
hopefully ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... enough info into a small buffer to set registers in the next ... Sprite but just blit it to the screen and forget about it ... is inside sp_UpdateNow when the screen is drawn. Whatever the tile ... The alternative was to store an entire Spectrum-size screen in memory ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... its aim is to be able to do something like Green ... quote]It would be great to see more people share their ... that. We all learned to code looking at some ... when I manage to add paging to a splib2-driven ... [...]are only 256 8x8 tiles to build these tile strings from ... -
z88dk+splib2 sprites question.I'm creating a game and I have several "states" for my main sprite, such as jump, facing left, facing right, etcetera. All those states require a dif…
... of altering the order the screen is drawn. I've ... that ultimate used to update the screen bottom to top to somewhat use the ... retrace to eliminate shearing - ... everything drawn in a back buffer and are copying or if ... -
Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
... Rob,
Another way to speed this up would be ... to use the b reg for ... then it would be quicker to roll out the code for ... - then you don't need to check if you cross a ... low byte of the screen address you need to preserve for each line ... -
Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... want the attr address and have the screen address the code is ... Attribute Address
;
; Computes the attribute address corresponding to a screen
; address ... ;
; enter: hl = screen address
; exit : de = address of attribute square
Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... want the attr address and have the screen address the code is ... Attribute Address
;
; Computes the attribute address corresponding to a screen
; address ... ;
; enter: hl = screen address
; exit : de = address of attribute square
Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... assumption that HL contains the screen address, but as the poster originally ... add on a routine to calculate the screen address from the XY coord ... add a good few T to the timing.128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…
... /> If I want to draw a sprite to the screen, say the top ... screen to 49152
Write to 16384
Then "Flip" the screen back to ... 16384
Or do I use one address all ... the time.
Sorry to be dumb ...Any examples of Proportional Font (Dark Star)Dark star had a cool proportionally spaced way of displaying text. Does anyone know of any code to do this? Cheers
... have finished the whole function to print a message at x ... />
ret
; HL = screen address
printchar:
Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.
... to do. Two pointers (say, ooh, HL = your data, DE = your screen ... compression code then write it to (DE), increment HL, DE, ... unless you're expanding a screen that's all about rocket ... depack routines to depack them to either the screen, or to a buffer for ...Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …
... information that I was trying to figure out.
Thanks ... also to Alcoholics Anonymous (Who posted while ... the fact I was trying to calculate it from the X ... Y coords and not the screen address.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…
... ;
; ;
; Moves the screen address down 1 line ;
; Written ... Incy: inc h ; try to move down 1 line in ...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 ... br />
Lets say that screen address is composed of:
ok so... we need to increment CCC and when it ... , make it directly add to AA instead of BBB... ... the value we want to add.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…
... edges of the screen. It is now modified to incorporate multiple ... sprite position calculation part seems to be fine because I ... It needs hl to contain sprite screen address, and de to contain databyte pointer ... is enough for the compile to fail.
The ...Extended Microdrive FormatterHello all, After a few months on a steep learning curve, some heavy duty reading and plenty of trial and error I?ve written an extended microdrive f…
... /> 1. Buffer at $4000
In an effort to make the ... code relocatable, I've started to use the screen ... as a buffer. Works well ... validation within the code to check where it is ... but would like to be able to carry on in ...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…
... /> inc h ; Move h to beginning of screen address tablw
ld ... /> inc h ; Move h to beginning of screen address tablw
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…
... h ; Move h to beginning of screen address
... h ; move to lo bytes of screen
ld ... screen
ret ; DE now has proper address ...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…
... ; if not, check to see if we need to move "Y"
to the counter idea and using ... exactly zero to know if the particle went off screen. This only ... />
Also, although computing the screen address from scratch using tables is ...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…
... h ; Move h to beginning of screen address
... h ; move to lo bytes of screen
ld ... screen
ret ; DE now has proper address ...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…
I`ll deffo have to pop in soon then...
< ... `ll need the speccy`s screen address or summit won`t I ... /> Oh, and I`m listening to Paolo Nutini finally... great unusual ...Spectrum 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…
... you just add 256 to the current screen address (or perform an INC ... simple ways to "avoid" the odd screen layout, I tend to generate a ... table of screen Y ... H to the start of your table, and get the screen address with ...Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…
... (as opposed to having to remember what the last frame address was and ... and the screen address stored in the struct_sp1_update for the char to figure ... was using this to alter sprite colours depending on screen position and ...The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…
... of code, click relocate, enter address to relocate too. Could probably fix ... games that use the printer buffer area, to run on my +3 ...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…
... sure if you wanted to see another solution or ... code]
call gethl ; hl = screen address at column 31
ld ... pop hl ; restore column 31 address
ld (hl),a ; ...
; convert hl to attr address, not shown
ld ...
