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IF and control flow in machine codeHi everyone, Basic has a nice control flow like if statements. How can these be done in machine code since i cant find anything thanks
... a ; a =a-1
cp 0 ; not needed, dec will ... becomes 0
jr [B]N[/B]z,loop
ret ... -
designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... 15)
3) Your operands (n and m) are all contained ... . You mentioned about having your n instruction giving the ability to ... , AND, XOR, INC, DEC, JP, CP etc.) and 3 bits for ... -
Your favourite tetris piece?Just playing on my turnarcade machine and suddenly got back into gameboy tetris. I love the little T shaped pieces, but cannot stand the z shaped on…
... &q=brick+game&cp=7&safe=off& ... &source=og&sa=N&tab=wi&biw ... -
Your favourite tetris piece?Just playing on my turnarcade machine and suddenly got back into gameboy tetris. I love the little T shaped pieces, but cannot stand the z shaped on…
... &q=brick+game&cp=7&safe=off& ... &source=og&sa=N&tab=wi&biw ... -
Sorting an array...Hi Folks, Over the weekend I had a play with sorting algorithms - takes me back to my student days! :-o My first try was with the good old Bubble S…
... =INT (RND*50)+1: LET n=INT (RND*50)+1:
n): LET v$(n)=o$:
NEXT i ... t ADDRESS
cp (hl) ;A=l$ cp (hl)=v$(t)
ld a,1
cp (IX+2)
ret z ... -
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... deliberate mistakes such as 'CP 0'... there is only ... ENTER
; 127 B N M SS SPACE
; ... /> ld a,c
cp a,0
jr z ... br /> ld a,c
cp a,SCRWTH-SPRWTH
jr ... /> ld a,c
cp a,SCRHGT-SPRHGT
jr ... -
Override AUTOLINE start?Hi there, Is there a poke that prevents a BASIC program from auto running, when it was previously saved with the LINE command? Cheers, Steve
... 23370: READ A: POKE N,A: NEXT N
50 RANDOMIZE USR ... compare with 0 - identifier
cp $00 ; for type 'Program'
Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... L ENTER
; 127 B N M SS SPACE
; < ...
ld a,c
cp a,0
jr z ...
ld a,c
cp a,SCRWTH-SPRWTH
jr ...
ld a,c
cp a,0
jr z ...
ld a,c
cp a,SCRHGT-SPRHGT
jr ...Learning Assembly LanguageHow easy would it be to learn assembly language for someone who has a decent grasp of Basic? I mean how long do you think it would take before I coul…
... ENTER
; 127 B N M SS SPACE
; ... /> ld a,c
cp 0
jr z,no_left ... br /> ld a,c
cp SCRWTH-SPRWTH
jr z ... /> ld a,c
cp 0
jr z,no_up ... br /> ld a,c
cp SCRHGT-SPRHGT
jr z ...yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... /> jr z,caps
cp SYMOFFS ; symbol shift?
jr ... ; increase end of buffer
cp KBDBUFFSIZE ; end of buffer?
.byte 0x20,0x02,'m','n','b'
;; with ... '
.byte 0x04,0x03,'M','N','B'
;; with ...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…
... behind a trail of partial "n"s.[/QUOTE]
No ... /> to:
LD A,(ATFLAG) : CP 2 : JR NC,GETXP
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... the connection is 115200-8-N-2 (2 stop bits ... rs232 into buffer @ 115200-8-N-2
;; input
;; ... ;; add 21 t-states
cp 0
dec a
cp 0
in a ... e) |8 t-states
cp 0
in ...Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... POP HL in LD A,n
print pop hl ; fetch ...
ld a,(hl)
cp 165 ; allow all codes + udg ...JK Rowling launches 'mystery' websiteI'm surprised no one has posted this yet, but (from [url]http://www.bbc.co.uk/news/entertainment-arts-13805346[/url] ) [SIZE="6"]JK Rowling launch…
... &q=emma+watson&cp=6&client=firefox-a ... &source=og&sa=N&tab=wi[/url]JK Rowling launches 'mystery' websiteI'm surprised no one has posted this yet, but (from [url]http://www.bbc.co.uk/news/entertainment-arts-13805346[/url] ) [SIZE="6"]JK Rowling launch…
... &q=emma+watson&cp=6&client=firefox-a ... &source=og&sa=N&tab=wi[/url][/QUOTE ...JK Rowling launches 'mystery' websiteI'm surprised no one has posted this yet, but (from [url]http://www.bbc.co.uk/news/entertainment-arts-13805346[/url] ) [SIZE="6"]JK Rowling launch…
... &q=emma+watson&cp=6&client=firefox-a ... &source=og&sa=N&tab=wi[/url][/QUOTE ...A standard emulator "hardware" for console outputAlmost every day, I want to copy text from zx spectrum format, yet, without peeking in the memory spending a lot of time, or typing it by hand, it is…
... thread. You can test under CP/M with SERIAL.FID, or ... INPUT a$
20 FOR n=1 TO LEN a$
n)
40 NEXT n
[/CODE]
INSTR function...Hi Folks, Another little program that people might find useful: [CODE]100 DIM i(4) 110 LET a$="This is some sample text" 120 LET b$="text" 130 GO S…
... ]
1 DEF FN i(n,t$,s$)=USR 23296
5b52 be CP (HL)
5b53 2006 JR ... FN n(n$)=CODE n$-CODE "0"-(7 AND n$>"@")-(32 AND n$> ... h(h$)=16*FN n(h$(1))+FN n(h$(2)): REM ...saving part of a BASIC programHere's a short routine to save part of a BASIC program. The idea is that it can be merged into a program and then used to save sub-routines, etc. to …
... )":
DEF FN n(n)=n-CODE "0"-(7 AND n>=CODE "A ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... .
ADD A,n Add value n to accumulator.
... Complement carry flag.
CP s Compare operand s with ... with input from device n.
IN r,(c ... br /> OUT (n),A Load output port (n) with accumulator.< ...AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... ;# values: CPL=C, NEG=N, RLC=(,RRC=), SLA=, RL={, RR ... ;step over "s
cp $22
jr z,NEXTQ1 ... opcode for BIT n (uses AND 2^n)
inc ...
OPTIONS:defb "C","N","(",")","","{","}","]"
defb "A","X","O ...BREAK from GOSUBHere's another one. Just in case you wanted to break out of multiple GOSUB levels with a single command, here's a routine to do it, tested on all mod…
...
LD A, D
CP $3E ;end of GOSUB stack ... NZ, $1E73 ;GO_TO_2 ;return through 'n' levels
EX AF,AF ...
JP NZ, $1F36 ;REPORT_7 ;'n' was too many levels
Create a new microdrive cartridge image formatHi there, I'm working to emulate the IF1+Microdrives in JSpeccy.I've found what the "classic" MDR format ins't capable to store all the required inf…
... formats (as Jiri's Lamac CP/M v2.2 does).
n < 255]
* FIRST GAP ...Amazonia (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027280"]Amazonia[/URL], please add the following "known errors" des…
... br /> a4b4 fe4e cp 4eh ; pressed uppercase 'N'?
a4b6 ... br /> a4b8 fe6e cp 6eh ; pressed lowercase 'n'?
a4ba 20e3 ... br /> a4b8 fe6e cp 6eh ; pressed lowercase 'n'?
a4ba 20e3 ...LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... WAWZ for all matches on (CP), the character at the ... pointer CN by incremental step 'n' from CP.
4. Mark each ... and where the character (PB+n)=(CN).
5. Repeat ... WA,WZ and Coding Position CP by PL+1.
... parameters WA,WZ,PL,PB,CP,CN (and some more) ...question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…
This routine (48 bytes) provides a BASIC replacement for STR$ which fixes those two bugs; use "FN s$(numeric_expression)" instead of "STR$ numeric_expression". I copied the ROM's method used in CIRCLE & DRAW for checking -1Machine 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 …
... adc a,$40
cp '0'
ret
[/ ... />
call divide
cp '0'
jr nz, write ... ;
; uses : af
cp 10
jr nc, alpha ... ;
; call l_setmem-n*2 to write n bytes to memory
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 …
... )
call asm_tolower
cp c ; *s1 - *s2
jr ... there will still be O(n^2) comparisons
;
; when ...
; usage at O(lg n). Only four bytes per recursive ...
