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50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... are you re-prepping the PUSH buffer for every pixel line? You ... should re-use the buffer to do all the pixel ... />
I set up a buffer with a row of PUSHes ... -
Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... stack pointer cheese and push/pop is faster to ... 's fourspriter to use push/pop, but copying a ... screen takes three cycles of push/pop.
... if throwing over a screen buffer version instead, which is ... also break the screen buffer into 2x1 blocks and ... -
Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
... ldir to blit my back buffer to the screen RAM, and ... about using the stack to push and pop stuff to the ... like:
ld sp, buffer
pop af
pop ... /> ld sp, screen+18
push hl
pop de etc.... -
Double Buffer UtilityHi Folks, I've been experimenting with double buffering on a 48k Speccy for a small project I'm working on. After reading lots of good advice here…
... PUSH HL','PUSH DE','PUSH BC\nEXX','PUSH IX','PUSH HL','PUSH DE','PUSH BC','PUSH ... .createBuffer() #1 - Create the buffer
self.specifyCodeAddress() #2 ...
#1 - Create the buffer
def createBuffer(self):
Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... />
When clearing the screen buffer, it was actually much quicker ... the screen memory area and push zero values onto the stack ... this worked because you could push 16 bits of data in ... one push as opposed to just 8 ...MakeTZX DMA Buffer Overrun ?Okay folks, Does anyone know why I get DMA Buffer Overruns when using MakeTZX. Could it be anything to do with my SB Enironment string or anything …
... know why I get DMA Buffer Overruns when using MakeTZX. Could ... it possible to change the buffer at all ?
Just ...Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... sprite + mask into a temp buffer.
2b. AND + OR ... from temp buffer to screen.
3 ... Smith pages, I implemented a "push-many-timer" scroller, great fun ...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 …
... /> b) Sprites drawn on buffer
c) Buffer copied to screen
; Fill Back buffer with a bright stripy pattern ... /> DI
PUSH AF
PUSH BC
PUSH HL
PUSH IX
Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... your platforms etc.
BUFFER (6k):
This contains ...
; Fill Back buffer with a bright stripy pattern ... br /> PUSH AF
PUSH BC
PUSH HL
PUSH IX
PUSH DE ...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,…
... to z80.info docs, a PUSH DE should take 11 T ...Buffer AdventureQuite a few months ago, probably this year but well before the 60-day history kept on eBay, I was outbid on a copy of Buffer Adventure by someone who…
... outbid on a copy of Buffer Adventure by someone whose user ...Return of Speccy screen buffer formatI recently discovered that the Spectrum screen buffer format that allows only two colours in an 8x8 pixel block has made its return in a slightly dif…
... discovered that the Spectrum screen buffer format that allows only two ...Playstation 3 "final push" on UKRThis says it all about the PS3 launch: [url]http://www.ukresistance.co.uk/2007/03/europe-at-war-final-push.html[/url] My favourite picture is this …
... /03/europe-at-war-final-push.html[/url]
My ...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…
... now that needs a final push to get done.
buffer (72 bytes for 9 UDGs ... the screen or to a buffer in memory. The scroller reads ... -width text bitmap from the buffer and scrolls that on the ...So... you want to format your 3.5" as 720K eh?Well, i've been trying to get hold of an application to make proper use of my 3.5" +3 floppy disks but i haven't been able to find any. I stumbled up…
... ,HEAD0 ; Our sector information buffer
LD B,18 ... interrupts before paging
PUSH AF ; Enter with IY ... 3DOS subroutine
PUSH BC
PUSH AF
LD ...The ZX printer buffer in +3 modeI have a few programs on .DSK images that were transferred from Timex disks, but some of them have code starting at 23296. Most of the time the code …
... crash and use the printer buffer area while in +3DOS? I ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... Pointer:
push af
push bc
push de
push hl
push af
push bc
push de
push hl
push ix
push ... from registers
push de
push bc
push af
exx ...Writing to the screen from a bufferI?m designing a game and am spending a bit of time trying different ideas before I commit my self. I?m currently thinking of writing data to a buffer…
... of writing data to a buffer and then writing this ?back ... buffer? to the screen. Can the ... screen be drawn from the buffer without flicker ? If not, what ...Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... I'm experimenting with screen buffer where I could draw my ... just copying static image from buffer to screen after HALT.
The Spec-chum 100 Push Ups challengeHi Spec Chums! I found this website last night, which says you can train to do 100 push ups in 6 weeks: [url]http://hundredpushups.com/[/url] It h…
... can train to do 100 push ups in 6 weeks:
push ups you can do when ...Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... serial (or byte order) buffer at 57484 to the Spectrum ... pointer
push bc
push de
push hl
... push af
push bc
push de
push hl
push ix
push ...
push hl
push de
push bc
push af
Disabling the +3 disk buffer; yes, but how?I would like to disable the +3 disk buffer in order to retrieve those 4K from the machine's RAMdisk. By reading the computer manual and some posts on…
... to disable the +3 disk buffer in order to retrieve those ...Trouble with rainbow effect push/popI'm having a bit of bother getting my rainbow graphics to behave themselves. Basically I want a rainbow effect to last for say 4 seconds before movi…
... problem is if I omit push and pop bc the thing ...
in a,(254)
;push bc
call flash
Push 'n' ChaseIt is my great pleasure and honor to announce the release of PUSH 'n' CHASE a game made with CGD featuring a wonderful loading and intro screen …
... release of
PUSH 'n' CHASE
push the mines all over ... "buy" your traps (push the money bags over the ... the water. Everytime baddies push the green button(s) ... into mines, You can push the crates against obstacles ...From RAM to dim v$() "video buffer" SPEED UP!Hi! This question is related to "quick RAM copy using LET in Basic" ([url]http://www.worldofspectrum.org/forums/showthread.php?t=44296[/url]). Wel…
... *20) DIM variable for "video buffer".
- A zone of RAM ... /make my v$ string "video buffer" for paint whole level screen ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... [CODE]
; Bi-Colour Scrolling-Buffer Game Engine for Four Player ... ld hl,char_obj_clear
push hl
push bc
call ... /> ;--------------
print_char_obj_hl_b_c
push bc
push hl
call print_attr_b_c ...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... decided to use a Double Buffer (DB) or 'Back Screen' to ...Currah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…
... /> push af ; save
push bc
push de ; the
push hl ... ld hl, (65362) ; address buffer
ld (hl), a ; ... put in buffer
dec hl ; reduce ... ld hl, (65362) ; get buffer details
ld (65364), ...Developing "Push n Chase" into a good gameI was wondering if anyone would like to help developing my CGD "Push n Chase" into a good game. [url]https://www.youtube.com/watch?v=cdZ5XYbterc[/u…
... to help developing my CGD "Push n Chase" into a good ... become traps which you can push to kill your enemies. If ... to buy the crates (you push money bags against special blocks ... ). Sometimes you are supposed to push blocks to clear the way ...
