-
Groundbreaking gamesWhich games really broke new ground? I mean the ones that actually got around the hardware limitations of the Spectrum. For example: Aquaplane - f…
... coding trick to update the screen very quickly so that the eye ... trick (something to do with a massive push-pop job on the HL register ... was faster than LDIR) to get the flicker-free graphics by ... memory and then copying it to the slower screen memory.
< ... -
Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …
... related to the fact that RST 0H will push the program counter onto the stack ... might need to be to pop off (and destroy) the top of the stack (added ... wonder why you need to do the pop hl in the "; uS_patch continues here ... -
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…
... more convenient to get rid of the "ld bc,192; push bc" business ... 32 to subtract from the display address in order to get to the start of the ... way; I'd just push and pop the display position since that combination ... -
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…
... .
All you need to do do is after performing ... your CALL IncY, if the D register (hi-screen address ... /> loop:
PUSH BC
...
CALL IncY
POP BC
[/code]
Saves a PUSH, POP and a B loop counter -
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…
... subtract the right constant to do the fade and change the entry conditions to make the ... code more convenient (it's always best to ... also prefer to place the push/pop saving any registers in the caller in case ... -
8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... agree. My thought was to make the functions "inline" but again ... which should leave enough time to draw the screen ...
[/QUOTE ... 1) You need to consider the 16 bit PUSH and POP and CALL (HL ... issue refers should apply to the general purpose registers only.< ... -
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…
... on the stack in the same order you declare the variables. It will push ... />
[code]
dump:
push hl
ldi x 32 ... to the standard way where the caller must clear the parameter from the stack with the "pop ... -
How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... the trick (with the fix suggested) but certainly is not the quickest way to ... the line start from the row number in B, trashes DE
PUSH ... DE
CALL $09EB
POP DE< ... to the next screen line.
; Alternatively could get HL back by PUSH/POP ... -
How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…
... to the next screen line.
; Alternatively could get HL back by PUSH/POP ... and then INC H.
POP DE ; Restore ... /> ; Carry means we need to move to the next block.
LD ... -
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…
... the call so that it knows to attach the "zx_cyx2saddr_callee" function to the binary, hence the ... push de
ldi x 32
inc hl
pop ... de
push hl
ex de ... /> ex de,hl
pop hl
djnz dump
Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
...
rr h ;Move back to the beginning of
rr h ... a
srl a
push af
sla a ;account ... now holds the 8 byte aligned scrn address
pop af
sla a ;find the modulus
...68000 programming.Anyone here know anything about this? My question is: how does the programmer know how long hisinstructions are? Do determine the operands to branch …
... 3,r6 #adding 3 to the stack pointer, like ... to as it ruins the stacking.
The 68K equivalents of push and pop ... are:
push ... d0 + $34 to the memory location pointed to by a1 and ...AftermathAm I doing something wrong, or is there a problem with both the TAP and TZX of [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0005934]Aftermat…
... 'push de' in the joystick routine but no corresponding pop. When the routine hits the ... RET instruction you catapult to the value ... been pushed onto the stack.The poke simply replaces the push with a nop ...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…
... pop hl
.down ; a replay of up
push ... push bc
call fill
pop bc
.offscreen2
pop ... z, offscreen3
push bc ; save current ... ld c,a ; to the right and left
New assember ideaAs i work with Eclipse IDE in my job i become more and more lazy. This leads me to idea that it is time to left Notepad+Tasm combo behind and move on…
... />
.sbrk_callee
pop hl
pop bc
ex (sp ... />
pop af
pop bc
pop hl
pop de
push af ... call to HeapSbrk_callee causes the linker to attach the code for that library routine to the ...Cross Platform DevelopmentWhat's the best way to develop cross platform apps? By best, the only limiting criteria would be "at no cost" :)
... multiplex the 7 tubes, 7 push buttons, plus the SPI communications port to shuffle ... of the C language. Every local variable access requires some push/pop sequence ... or access through the index registers to read or ...Minigame Compo 2007Hi there, also this year, there'll be a minigame competition, open to all 8-bit computers and consoles. It consists on writing games whose size (…
... /> out (254), a ;HA! the OUT to indicate depacking. if you need ... DE
; JR NEXT
;to the four bytes which are occupied ... /> jp z, start
push de
ex de, hl ... , de
pop de
;now we have to decode length ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... on
push hl ;otherwise, save posn to be copied to
ld ... copied from
pop hl ;load posn to be copied to
nextblock ... ,h ;otherwise, get ready to point to the next line up
sub ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... , the fastest way to move data around on the z80 is with push and pop ... . So the ... the screen, scrolling by more than one pixel, or moving to a push/pop ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... the fastest way to move data around on the z80 is with push and pop ... . So the ... fastest scroll you'll get is by moving the ... exercise to the reader ... push and 10 for pop. Don't we need both to ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... needs more unrolling to improve this and perhaps the push ix/pop ix actually ... 4 cycles each in comparison to regular push/pop). The "ld sp,hl; ld ... . So we push in the reverse sequence we popped to move back toward ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... notice I took out the push ix/pop ix pair because this ... might want to put that push ix/pop ix back to move 16 ... push ix/pop ix take 29 cycles compared to the 21 for regular push/pop ... and will decrease the copy ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... scrolling game I was trying to remember the name of...
push/pop stack routine but it could be for the second ... display file too (to eliminate any flicker ...help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... By changing HL' the program is crashing to a C nonsense message ... from inside the interrupt... ... probably.
So the end of the push/pop block should be:
[/code]
to keep the contents of HL'.What a crappy nightJust got home from a very stupid situation, so I will post this story to bore you. I was hanging out at a mate's place until pretty late. At about 2…
... once...2 doors..one to the bedroom one to the bathroom..somehow I had ... flicked the twist locks on ... some reason with me in the 4ft closet.
... in the handle that you can push a thin object in to pop the lock ...Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…
... br /> // add "-lrect" to compile command to gain access to the library function RIsIvalInIval8 ... />
pop af
pop hl
pop ix
pop iy
push af ... br />
The last parameter to the function is a tolerance. The 2 used ...Bresenhams circle algorithmI post here my final circle code to replace, if you want, the one in the ROM. It only uses integer math and runs very fast and is very compact. It is…
... to the Zx OS
exx
ret
plotpixel:
push ... hl
push bc
push de
call $22e5
pop de ...
pop bc ...ANN: Spud v0.201New version of Spud released. Nothing major just a few bugfixes thanks to user feedback. At the soon to be usual link [COLOR=#4040c0][URL]http://…
... that window always loses focus to the main Spud window when you ... 't re-scaled to fit. Perhaps the ability to resize the window beyond maximum ... - In debugger, tools -> Push and Pop value, do they do anything ...ANN: Spud v0.201New version of Spud released. Nothing major just a few bugfixes thanks to user feedback. At the soon to be usual link [COLOR=#4040c0][URL]http://…
... that window always loses focus to the main Spud window when you ... 't re-scaled to fit. Perhaps the ability to resize the window beyond maximum ... - In debugger, tools -> Push and Pop value, do they do anything ...Design Design / Crystal ComputingNice post on [URL="http://groups.google.com/group/comp.sys.sinclair/browse_thread/thread/56e6ebdedc6930ac#"]comp.sys.sinclair[/URL] about [URL="http:…
... /> push hl ; store alien address on the stack.
inc hl ; point to ... ,e).
pop hl ; retrieve alien address from the stack.
... hl' helps here since the 'pop hl' after the 'call disply' will ...
