-
Sprite MaskingI was looking at the sprites in some games, and noticed they have sprite followed by mask. Usually a row at a time (so the mask is sort of interleave…
... as fast as setting the stack pointer and using push and pop, as ... -
Machine Code Microdrive File LoaderI've been experimenting with transferring games to run from microdrive. Typically I like to see a loading screen while things are happening, and I li…
... /> ;
main exx
push hl ; preserve return to basic ... ; fetch current error return
push hl ; and preserve
;
copy
ldir
;
... channel
;
push ix
pop hl
add hl ... -
LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... />
The idea with [b]pop/push[/b] loops is that [b ... ]push[/b] writes two bytes more ... 're even better for super-fast CLS routines. Jonathan Cauldwell covers ... -
Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... /> push de
push hl
push ix
exx
push af
push ... /> push hl ;106
sp7
ld sp, 0
pop ... clever and longer loop would copy 256B per iteration and update ... -
Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
[QUOTE=Matt_B;465610]The quickest copy would use LDI during the ... gasman) find the quickest copy is to POP from uncontended memory during ... of one screen line), then PUSH to screen memory during the ... -
SpecOS progressOk, As you can all see, I'm back - and I've been working away on SpecOS for a while now. There's a few videos, which you can see on my blog: [url]h…
... just use labels and introduce PUSH var, POP var commands to allow ... for all this, not a fast beast just something which speed ... -
logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... ) ;store CD_ADD
push hl ;in stack, so ... /> ld hl,Expression ;And copy my expression...
ldir ... later while evaluating.
pop hl ;Recover pointer to ... -
logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... returned in DE.
pop hl
push de ;Store address of ... copy the param block to the workspace.
pop de
push ... -
Opinion on new 128K only gamesHello, Being new to the WOS community, I am unclear on the attitude towards 128K only software, that is; Is there a strong need to support the 48K m…
... line shell that I just copy and modify for any specific ... /> ; ------------
.slow_down:
push edx ; ***SLOW VERSION***
jne .slow_across
pop edx
add esi ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... />
.down: push edx ; Copy data
push esi
... jne .slow_across
pop edx
add esi ... [ebp+hermite_y3]
pop eax ; Count
... the limited use of 'PUSH' and 'POP' and the large ... -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... the limited use of 'PUSH' and 'POP' and the large values loaded ... 259 8-bit registers, the fast zero page instructions meant there ... -
later today......[IMG]http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs909.snc4/72268_172079126142549_100000213882336_641184_4866225_n.jpg[/IMG] [IMG]http://sphotos.ak.f…
... extra halts :) , although not as fast as possible , this is my ... game I will try more pop/push method that someone once advised ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... [code]
; FASTPRNT.S - Fast character printout
; J.G ... 8 pixel lines
POP HL ; Get print position ... br /> ; Set attribute
; -------------
PUSH HL ; Save print position
POP HL ; Get print position ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... [code]
; FASTPRNT.S - Fast character printout
; J.G ... 8 pixel lines
POP HL ; Get print position ... br /> ; Set attribute
; -------------
PUSH HL ; Save print position
POP HL ; Get print position ... -
Supertest 128 - Loader QuestionI wonder if someone could explain (in simple terms please) :) , the purpose of the switch code. I see what is doing (going to 48k mode via spectrum)…
... buffers]
; F. Copy 5:4000 to 7:DB00 ... dodos
;
; F. Copy 5:4000 to 7:DB00 ... ;
diewith:
push af
ld iy,DDOFF ... />
dodos: push af
push bc
ld bc ... pop bc
pop af
call pciy
push af
push ... -
What is the sickest film you have seen?Ive always thought that these films were sick - [URL="http://www.imdb.com/title/tt0078935/"]Cannibal Holocaust[/URL] [URL="http://www.imdb.com/titl…
... nasty, but the kind of pop out like one of those ... Recently got hold of a copy of the Japanese film 'Grotesque ... see Grotesque. I had a copy pre-ordered, but it ... fancy trying to get a copy through customs. i know it ... and Blood get old rather fast and the other 2 I ... -
Converting TRD-Dos into TapHello, there are still many programs appearing on TRD-Dos or SCL format and users of normal Spectrum cannot run them. Of course I know about emulator…
... these files together by typing "copy /b code1.tap+code2.tap ... it:
[code]PUSH HL
POP IX
LD A ... a tap file
* Type "copy /b loader.tap+all_code.tap ... the whole lot together using "copy /b basic.tap+nearly_done.tap ... -
Gigascreen - programming guideDoes anyone know of a programming guide for the 128K gigascreen screen mode, specifically a persistence colours table, some code (pref. C level or BA…
... they'll get messed...
PUSH HL ;...around with.
PUSH HL ;Copy HL (attribute address)...
POP DE ;...to DE ... .
POP HL ;Recover numbers...
POP DE ;...
POP AF ;...from ... -
Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
... shift table approach would be fast enough compared to pre-shifted ... is why everything is so fast, there's no game logic ... ,a
put_blanksprite1 push bc
exx
pop bc
exx ... /> add hl,de
push hl
pop ix
ld a ... -
Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... something like:
[code]
pop hl - each tile starting address ... any of the block copy operations or even PUSH to the display ... .[/QUOTE]
I can use PUSH as easy as i can ... -
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 …
... />
Updating the SP for POP/PUSH can be done like this ... /> push bc ; 11ts
push bc ; 11ts
push bc ; 11ts
push bc ... cycles to work out how fast this would really be. -
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 …
pop reads two bytes from SP into specified register pair and increases SP by two. push decreases SP by two and stores two bytes from specified register pair to SP. These operations are not copy anything. -
SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... Z80 routine replicates the old COPY command. You can call ... it with COPY 65446. While the original command ... required.
[code]
; COPY command for the ZX Printer ... /> push hl
push bc
call copy_line
pop bc
pop hl ... -
SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... at 63550. Call it with COPY 63550. IM2 mode is then ... a hi-res CLS with COPY 44252.
[code]rep_j ... />
zap_loop:
push hl
push de
push bc
ld ... /> ld c,l
pop hl
push bc
ret
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... font (which I had to copy from a text editor due ... /> do_it:
push hl
push bc
push de
push af
call doit1
pop af ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
...
pop af
Don't you mean push? It ... code does with AF is copy from memory to registers....not ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
...
pop af
Don't you mean push? It ... code does with AF is copy from memory to registers....not ...Back to BASIC[U][B]Archaeology guide to programs compiled used MCODERII.d[/B][/U] After various people have been talking about "Frank'n'stein" I decided to finis…
... 28749 33 107 92
PUSH HL ; 28752 229
... 28753 33 0 0
POP DE ; 28756 209
POP DE ; 28769 209
... CODE]
3) Copy the string into the workspace ... 28830 33 2 0
POP DE ; 28833 209
Move objectHi again, I am using paper colors to represent game objects. I have a "paddle" that is 4 pixels wide. I save its position as a 2 byte word in memory…
... /> or
PUSH DE
POP HL[/QUOTE]
RST 16 ; fast call
ld ... />
RST 16 ; fast call
ld ... />
RST 16 ; fast call
ld ... />
RST 16 ; fast call
ld ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... channel type 'P'
pop hl ; allocated address plus ... br />
push hl ; save AT_COL address ... ; Main loop to copy 8 font bytes into ... :
pop hl ; restore AT_COL address ...
