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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] ; ***********…
... br /> PUSH AF
PUSH BC
PUSH HL
PUSH IX
Spriteloop:
PUSH BC
; ... 256 bytes forward in memory to FB0Ah
... 256 bytes forward in memory to FB0Ah
... -
Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…
... would use up too much memory.
[url="http://www ... check against
CDLOOP PUSH BC
LD BC ... -
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 …
Thanks All,
I will modify the code for the faster push pop, move the buffer memory and see what happens.
Many thanks -
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 …
...
PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH AF ... MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... -
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 …
... PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH ... af'
PUSH BC
PUSH DE
PUSH AF
memory location COUNT.
< ... -
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 …
...
PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH AF ... MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... -
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 …
...
PUSH BC
PUSH DE
PUSH IY
PUSH IX
PUSH AF ... MOVING 256 BYTES FORWARD IN MEMORY TO FB0AH
LD H ... -
I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... . Simply put, does this command push the contents of PC onto ... a perpetual loop - jumping to memory address 38, which has the ... making it jump back to memory address 38.
Have I ... -
Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…
... inc hl
push hl
push af
; ... version) ----
push de
push hl
... /> ld bc, EraseRow
push bc
ld bc,(Sprite_RotateAddr ... ; DEFW Lft1
; memory stores to make life easier ... -
How can I scroll a line of text and wrap perfectlyI know this is easy for most of you but for some reason I am messing it up. In Assembly Language I want to do the following: I have 1 line of text …
... to point to the screen memory (at end of the line ... you've scrolled 12 bytes, PUSH the whole lot back move ... DE,0, ADC HL,DE, PUSH HL and you should get ... -
If you could re-design the Spectrum...Let's suppose you could go back in time to the beginning of the Eighties. The Spectrum is being designed as the revolutionary successor to the alread…
... need 24k for the video memory under this sysetm - so forget ... dealing with 24kb of display memory with nothing but a Z80 ... twice the Speccy speed to push data around... you'd also ... -
Only two new posts in 2 days?What on earth is the Spectrum community coming to? Finally run out of things to talk about? Things are so bad, we may have to resurrect the old bea…
... (or google groups at a push if you're scared of ... address of the Speccy display memory) regularly heads off topic. If ... -
The soul of the computer game industry...What are your thoughts on the state of the computer game industry today compared with the industry in the early to mid 80's? Has the soul gone? I fo…
... and then when programmers couldnt push the Speccy any further they ... get a 3d card, more memory/faster processor just to keep ... -
Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... be looping accross the whole memory.
ORG 50000
INC L
PUSH HL
LD (HL),A ... -
Help needed to speed up functionCan anyone help me to re-factor this code snippet. The "MAP" section holds information about which tiles go where on the screen (handled by another f…
... eliminate all double routines ( the PUSH after INC L did that ... the code, but that costs memory. I think this is a ... nice compromise between speed and memory.
_________________ ... -
About z88dk and autoexecsThis weekend I was playing a little with z88dk C cross Compiler. Amazing tool! I have three questions: 1- Does anybody know how to change the initia…
... is a good choice as memory starting at 32768 is uncontended ... the stack. The most recent push is the return address, and ... the stack grows down in memory (think in terms of pushes ... -
Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
... to fill a block of memory. However, the loop construct in ... one PUSH in each iteration - or, if you have enough memory, forget ... a very long string of PUSH instructions. (Unfortunately this might be ... -
Fastest way to write something to screen$Hi, I just got pasmo.exe and start playing with attr scrolling, well, not scrolling, just write different values to a block and see if I can introdu…
... to fill a block of memory. However, the loop construct in ... one PUSH in each iteration - or, if you have enough memory, forget ... a very long string of PUSH instructions. (Unfortunately this might be ... -
How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... code running in contented memory but about SP pointing ... to contented memory, so, the opcode ... is read from normal memory but the value must ... be written to contented memory.
And why ... push de so wheres the data about writing to contented memory ... -
How many T-states takes PUSH DE ?Hi. Just a quick one. According to z80.info docs, a PUSH DE should take 11 T-States to be executed. But WHAT if SP is pointing to Contended Memory,…
... it again then :(
PUSH dd pc:5,sp-1 ... Programm Counter is in contended memory then insert states)
(if SP points to contented memory then insert cycles)
(if SP points to contented memory then insert cycles)
New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... that one will see more push. The more specific libs like ... with more than 64k of memory with the crop of free ... of the type "when this memory segment is active, so will ...128 ramdisk loaderanyone got a program which will save the contents of ramdisk to tape in one go, rather than saving each file seperately then loading them and save!in…
... Z80 cannot address that much memory at once and there is ... bytes switch to the next memory bank and reset the load ... ),a
ei
push bc
push hl
ld ix ...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…
... to encode
; de = memory address to write encoded symbol ... tree leaf for symbol
push hl
exx
memory byte
ld c, ... cp h
.foundchild
push af ; save: nz = right ...The ULA and ScreenI've asked something similar before but please bear with me. I'm trying to understand the way the screen is controlled. The ULA controls output to …
... true that you have to push more memory around in the hi ... do less than in the memory-light Spectrum mode but it ...16K games.Hi all, Cauldwell's stuff aside, are there any good 16K games that you'd recommend? Regards, Shaun.
... . To make matters worse the memory that is available is in ... contended memory (shared with the ULA). Also ... just how far you could push the '16K' envelope.
[/quote ...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…
... number of sprites a some memory you could do something like ...
...
...
PUSH HL
LDI
LDI ...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…
There are lots of ways to optimise this - are you bothered about memory? e.g. the ldir to clear the screen is very expensive. A quicker way is to set the stack at the top of the screen, ld hl=0, and then 3072 push hl statements128k 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…
... 49152
;flip memory bank *only*, without waiting
FlipScreen: push af
ld a,(rampage ...
PageRam: push bc
push de
and 7 ...4-pixel scrollingDo you think is 4-pixel scrolling accetable for horizontal shooter ? (aka do u like Chronos ? :)
... by using the stack to push data onto the screen - the ... Z80 PUSH command is very quick compared to other memory transfer commands ...
