-
Inefficient code in ROM, from ram-check to RAM-DONEHere is the inefficient code: [CODE] ;; ram-check L11DA: LD H,D ; Transfer the top value to the HL register LD L,E …
... />
;; RAM-FILL
L11DA: LD (HL),$01 ; Load memory with $01 - blue ... ink on black paper.
DEC HL ; Decrement memory ... NZ,L11DA ; Back to RAM-FILL if not.
;; ... -
Help pleeease "Proving Emulator OpCode flags are correct"So I had a cunning plan... I wanted to write a test harness for Emulators that could "prove" that all opcode flags were correct. I wanted something m…
... in three memory addresses takes 6 seconds. Multiply this with the outer ... /> PUSH HL
PUSH HL
PUSH HL
PUSH HL
PUSH HL
PUSH ... -
Optimize this: Distance CalculationBased on a taylor series expansion, suggested by NA_TH_AN, I've got this so far, which is far far faster than SQR(X^2+y^2) Formula is: in a right an…
... desired.
a) fill table with scaled values of log(x ... see more use if the memory was there.
i ... i could get faster multiplies with exact accuracy but we'd ... -
Matching calls and returnsHi all, A pretty fundamental question here that I probably should have sorted by now. I've noticed how much the stack has built out in my current g…
... . Go to that address in memory and check the previous three ... that the value is a PUSH that is never POPPED. Again ... deadline I probably will stick with my stack clean up solution ... -
The most powerful 8-bit machine, and CPU?Further to the discussion in: [url]http://www.worldofspectrum.org/forums/newreply.php?do=newreply&p=621787[/url] What actually is the best 8-bit ma…
... well in the instruction set with a nice set of addressing ... sort of thing). You can push or pull multiple items on ... register) with a single instruction, allowing you to shift memory about quite ... -
What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …
... caveat :- bankswitched memory is hard to deal with; it is not ... be bothersome, even with access to unlimited bankswitched memory.[/QUOTE]
< ... think about memory as we do when dealing with paginated RAM ... small files, not files that fill up the entire RAM. ... -
What if there was no memory or space limitation?What if there was no memory or space limitation? We've had topics about the limitations of the Speccy's hardware, topics where we discussed how good …
... to think about memory as we do when dealing with paginated RAM ... small files, not files that fill up the entire RAM. Can ... treat the entire thing like memory. The operating system will pull ... avoided. The minimum amount of memory the program needs to avoid ... -
TommyGun Question by Mister ignorant."64KB limit passed inside instruction" What have I done?
I'm not familiar with using TG as a code ... at the end of the memory (63488 - 65535), which could probably ... a quick check you could fill it with a given value ($CD ... the stack works down in memory, not up). -
I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... happens? I hit the boss with a mine and knock him ... make sheva useful, fill her inventory up with all the types of ... the rest, she shoots everybody with the handgun, and never throws ... things like carry the lamps, push the whatever out of the ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... over-write the offset code with LDIs again, ready for ... fill-in at the edges from larger tiles. And with ... you could devote more memory to techniques rather than ... do a similar trick with that screen row address ... or follow each entry with the address of the ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... high lines).
1. Fill a line of new attributes ... -wise, it fills empty areas with something like ink0/paper0 which ... -shifted sprites are stored in memory in a format like this ... -
z88dk vs. sdccI've just read this article (in Spanish) [url]http://www.cpcmania.com/index2.asp?urldest=Docs/Programming/SDCC_vs_z88dk_Comparando_tama%F1o_y_velocid…
... />
[code]
push bc
... ; no memory error detected
jp ... /> ;; the z88dk memset library code, with asm entry point:
In Java for ZXHi All I am glad to notify you that I have opened the sources of my J2Z80 translator (0.1 version) which allows to use Java toolchain to generate Z8…
... there is not any difference with AF, mainly I save registers ... two code block in the memory manager which prepare a ... /> POP IX
PUSH BC ; place the return address ... IX restored
PUSH DE ; the return address restored ...In Java for ZXHi All I am glad to notify you that I have opened the sources of my J2Z80 translator (0.1 version) which allows to use Java toolchain to generate Z8…
... there is not any difference with AF, mainly I save ... 't waste time to PUSH/POP disposable data all ... code block in the memory manager which prepare a ... -party code to be broken with this change.
with about the same performance ...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 …
... version that does this with just one daa : ... />
[code]
; exit with hl=0, carry set
with known carry flag state ... functions (ie not error) with known value in hl ... push hl
push bc
call malloc ; get bc bytes of memory ...ESXDOS v0.8.0 released (with NMI Browser)Hello, To celebrate the speccy's 30th birthday, here's the latest version of ESXDOS for DivIDE users. The full changelog is too long to post here, s…
... 9 without virtual memory on a 128MB RAM machine with the OS ... managing memory resources... now 8GB RAM and the OS X fill it with ... TOS disk images on .vdisk with a TOS -> +3DOS converter ...BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... character wide fairly easily now with looped code and a moveable ... -wide if I really push the timing with everything unrolled and fixed ... , except the processor time and memory that gets swallowed up. In ... a ZX81.
One memory-saving trick is to prepare ...Saving space using procedural graphicsAfter spending several hours playing around with various packers to squash the Alien8 test screen$ it occured to me that maybe bigger space savings c…
... to open your z80 snapshots with SpecEmu, only Spin opens them ... /> ld ixl,41
l40021: push de
call l40044
memory ok.64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... (that go right-to-left) with moving the stack pointer from ... changing SP and doing a PUSH. You can also use it ... problem is the fastest operations (PUSH) fill right-to-left when, to ...64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... crap assembly coder, so bear with me.
I ... br />
;; First we fill screen 0 with the pattern and
;; First we fill screen 1 with the pattern and
l1:
push bc
;; Show ...64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
...
;; First we fill screen 0 with the pattern and
;; First we fill screen 1 with the pattern and
back:
push af
push hl
;; ... 912 TS
push bc ; 10
...64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... /> ;it is memory area 65024-65281 filled with 255
... />
PUSH IY ;copy MV11
PUSH IX ;copy MV10 ...
PUSH AF ;copy MV9 ...
PUSH BC ;copy ...64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... /> ;it is memory area 65024-65281 filled with 255
LD ... />
PUSH IY ;copy MV11
PUSH IX ;copy MV10 ...
PUSH AF ;copy MV9 ...
PUSH BC ;copy MV8 ...
