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FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... ; the FN statement setting FLAGS and leaving
; ... br /> [code] POP HL ; pop the start address ... .
POP AF ; restore saved result ... -
tiny routine to shift RAMTOP & stackCompressing some data areas above RAMTOP and wanting to make the released space available for BASIC arrays, I needed to move RAMTOP without using CLE…
... be used. This FLAGS bit is not used ... DEC BC ; 11
POP HL ; 225
LD ... ;to new location
POP DE ; 209
LD ... 27 ;$1B76 STMT_RET
POP BC ; 193
... -
Procrustean PrintingHere's a short routine to manage printing of text with command tokens, to avoid messing up the screen when they are expanded. It just prints as many …
... reset flags
push hl
SSNEXT1:pop hl ... printed max_length?
SSEND: pop hl
ret
... ;print a character
pop af ;A =last token ... (ix+0),0 ;reset flags
jr nz,SSNEXT1 ... -
z88dk sticky?I've just tried to PM Alcoholics Anonymous and couldn't because "Alcoholics Anonymous has exceeded their stored private messages quota and cannot acc…
... unget char, and contains various flags (unget char available, open for ... driver function dispatcher, some standard flags and a reference count. When ... to the caller is then 'pop ix; ret'
Regarding ... both and the r/w flags will ensure that, eg, ... -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... pointers mid-loop affected the flags, corrupting data being copied. That ... get real benefit from push/pop copy.[/QUOTE]
Won't ... -
Shadow registers.I assume it's faster to transfer the registers to the shadow registers rather than using the stack? Let's say that I want to temporarily preserve the…
... than a push (11T) and pop (10T) combo. If changing BC ... doesn't affect the current flags, if you need them.
Shadow registers.I assume it's faster to transfer the registers to the shadow registers rather than using the stack? Let's say that I want to temporarily preserve the…
... as a NOP. PUSH and POP take longer at 11 and ... on another four for PUSH/POP IX/IY (and you can ... that you've altered the flags as well as A. And ...Shadow registers.I assume it's faster to transfer the registers to the shadow registers rather than using the stack? Let's say that I want to temporarily preserve the…
... as a NOP. PUSH and POP take longer at 11 and ... on another four for PUSH/POP IX/IY (and you can ... that you've altered the flags as well as A. And ...28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... ]That way, if you ever POP an attribute into AF that ... 'm especially flakey with the flags ) but just for interest, why ...128K+ Keypad Swapsies.I've been offered a swap, a Spanish 128k keypad, for one of my UK microdrives. Is this a good swap?
...
pop de
pop bc
pop hl
pop af
FLAGS
call l3a42 ; attempt ... must be paged in)
pop ix
ret[/code]< ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... ;****************************************************************************
; POKEable flags, 6 bytes
... pop af
pop bc
pop de
pop ...Halo 4Halo 4 is great! At least it is so far, but I've only been playing it for a couple of hours. If you don't like the Halo games then this won't change …
... someone quits, someone else can pop in and take their place ... ...I constantly found myself defending flags or assisting people in killing ...RET MHello. I?ve seen in the Joffa game SAUCER a kind of loop like this LOOP LD A,R RET M JR LOOP I do know what this loop mea…
... ), INC A, LD (CLOCK),A, POP AF etc
2 ... > Also how are the flags being affected for the RET ... R register to affect the flags.MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... the 5+3 flags after POP AF ; SCF and POP AF ; CCF ... few other instructions between POP AF and the SCF/ ... instruction didn't modify the flags, it was still OR. ... if it did modify the flags, I realized I couldn' ... used instructions which set the flags based on A. I ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... /> PUSH AF+POP AF
PUSH BC+POP BC
... /> LD BC,x+PUSH BC+POP BC
EI
... operations which affect the flags. I played with INC ... when an operation affects the flags, the subsequent SCF or ... operation doesn't affect the flags, the subsequent SCF or ...SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... If an instruction modifies the flags, the immediately following SCF/ ... explicitly clear - by modifying flags I mean updating the individual ... The EX AF,AF' and POP AF instructions, which technically change ... [/B] considered modifying the flags in this regard, so ...Machine code loopsDear all, 30 years too late I know, but I'm finally starting to get to grips with Machine Code - something I could never manage back in my early tee…
... effection the flags in my online source
nor is POP rr ... but when rr is AF the flags are effected ...Machine code loopsDear all, 30 years too late I know, but I'm finally starting to get to grips with Machine Code - something I could never manage back in my early tee…
... effection the flags in my online source
nor is POP rr ... but when rr is AF the flags are ... 's bad to say that pop rr doesn't - because ... way to store the current flags if you want to do ... , and can then POP AF to get the flags status back. (As ...Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... for things like address mode flags, which register you are operating ... .
A PUSH and POP that uses a post byte ... get complicated.
The PUSH/POP addition would also be easy ...New game: The curse of OddvilleDon't get too excited! :p Just wanted to share this because the coding of it is driving me mad, or rather the game designer is. The curse of Oddvil…
... a substitute for more traditional pop-up dialogue), though I'd ... very understandable! A few more flags would have enabled more complexity ...Full 16*16-digit BASIC multiplicationI liked Andre Adrian's 32-bit long multiplication routine so much that I decided to a decimal version. After all, 2^63 is only 9223372036854775808, a…
... c,$2da2 ;FP_TO_BC
pop hl
pop de
ex de ... REM NEEDS REGISTER A, CHANGES FLAGS
; 994 REM ALT REG ... 2d2b (discard)
pop bc ;BC=$3365
pop de ;DE=$0000 ...Games featuring... relevant bugsThere was a recent improvement to the WoS database in order to classify [URL="http://www.worldofspectrum.org/forums/showthread.php?t=34261"]Games fea…
... ] and a [B][COLOR="Red"]pop[/COLOR][/B]? [POKE 42185,245 ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... /> ex af,af' ; stash the flags away for later
call ... indicates load error
pop hl ;remove the data length ... zero to signal BREAK
pop bc ; abandon this routine ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... test and jump based on flags. Let's take an example ...
push af
pop de ; flags now in 'e'
bit ... this example) and testing the flags register using the conditional branches ...
