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Zymosis -- WTFPL'ed Z80 Emulation Corebreaking news! i'm back with another useless project: new Z80 emulation core written in pure C! i hear you screaming: "oh, no! WHY?!" let me tell yo…
... 'opinfo' module to get opcode length and some opcode info (is it branch ... -
Assembler v Machine CodeHi. I've been looking at a lot of the code examples in the Development section and can see that Assembler is the way to go. However, I was wondering …
... , except for fun. I memorized opcode length and T states spent for ... -
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…
... this for T-States and opcode length/binary representation info
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…
length of 48k .sna fileJust a quickie :) Is the length of a 48k .sna 49152 or 49153, i.e. does it go from 0 to 49152, or from 1 to 49152? (If that makes any sense?) Cheer…
Just a quickie :) Is the length of a 48k .sna 49152 or 49153, i.e. does it go from 0 to 49152, or from 1 to 49152? (If that makes any sense?)
Cheers :)Run Length DecodingRun length encoding/decoding is far less efficient than using a modern compression program.
Run length encoding/decoding is far less efficient than using a modern compression program.Plus 3 lengthHi all, I have won myself a Spectrum+3 from eBay, I have a slide table under my computer table. My Spectrum+2B fits nicely, how ever I think the+3 is…
A tidy loader for minigamesThe minigame competition doesn't permit the use of separate loaders like [code]10 LOAD "": RAND USR 32768[/code] The loader must be included in the b…
... ANY
2 4 Line length (stored as 2 bytes)
9 239 Length of variable (in bytes)
bptap2ay - song length problemI searched the forum for a bptap2ay topic and never found it so started a new topic. The program converts Beepola tap files to ay files and is here.…
... have to patch in the length of the songs (with a ... it possible to calculate the length of the song automatically during ...Opcode QuestionsHi all, I am an experienced LabVIEW progammer and also have fond memories of the spectrum. Thus I started to think about writing my own emulator an…
... know how to understand the OPcode imstructions correctly I should be ...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…
... that could "prove" that all opcode flags were correct. I wanted ... program to "brute force" an opcode
Sent all results back ... of affected registers for every opcode)? Doing this BASIC/Assembly combo ...Elliptical ChallengeSubsequent to the recent "Graph Plot" thread, I wrote this general purpose ellipse drawing routine which will plot (although it doesn't actually use …
...
a = CHR$ 1/2 length of x axis- 1-255 ...
b = CHR$ 1/2 length of y axis- 0-255 ... ;calculate the SET b,(HL) opcode for bitpos
add a ..."Decoding z80 Opcodes" (http://www.z80.info/decoding.htm#intro) - Incorrect HALT Opcode?Apologies if this is a dupe but I searched within the forums and couldn't find anything. I've been working on a z80 emulator (for academic and rec…
... to incorrectly specify a HALT opcode as 0x7[i]7[/i ... .g. it says given an opcode, digits 7-6 should be ...why does line length affect angle?I am using Plot Draw to make a V like drawing. It's part of an intersection on an isometric path. You would expect one half to be the inverse coordin…
... why does altering the line length affect the angle of the ...Zeus Assembler Object Code LengthHi, I'm starting out assembler programming with Zeus Assembler. I've followed the tutorial in the manual and it seems quite nice to use. The on…
... gives you the location and length of your source but I ... give you the location and length of your object code?
i want to save a snapshot file from snap to tap onto my hdd. what code address and length is it?hi, i want to save a snapshot file from snap to tap onto my hdd. what code address and length is it? i cant seem to find any info on this.
hi,
i want to save a snapshot file from snap to tap onto my hdd. what code address and length is it?
i cant seem to find any info on this.Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... way to find out instruction length at that address in Z80 ...+D/Disciple games archive?Hi all, Having finally got my disciple to work, I'm starting to have a look at hacking multiload games. Is there any archive on the web with games t…
... . The hack is a special opcode -- the "NOPD" instruction $ed $?? inserted ... point hold the code address, length and identify the data block ...I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... of memory, 65536 bytes in length, to use as spectrum memory ... space for various parameters the opcode will expect.
... Perform the opcode's operation, and increment your ... - and handily enough, each opcode takes a number of T ...Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
... long but 20 bytes. The opcode LD HL,(xxxx) takes 4 ... the code is the same length as his first try.
Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…
... long but 20 bytes. The opcode LD HL,(xxxx) takes 4 ... the code is the same length as his first try.
opcode ;)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…
... single BYTE opcode. It initially took the length of ... /> 0001h LDI A,Fh ; Opcode 0001 1111 - A = 000Fh< ... /> 0004h LDR A,Fh ; Opcode 0010 1111 - A = FFFFh ... )
0017h JNC A ; Opcode 1111 0001 - PC = 001Bh ... br /> 001Bh LD A,RA ; Opcode 1000 1110 - A = RA ...New tool: ZXBOOT.EXE[B]ASM[/B] is proud to present the first release of ZXBOOT.EXE: [url]http://www.4shared.com/file/NP-FVOSf/zxboot__beta_.html[/url] ZXBOOT is a comma…
... saved Z80 code space. The opcode 0 (NOP) must be added ... /> 1691 BYTES saved
Length: 40549
Origin: 24987
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…
... HL,DE is not an opcode.
You need to ...
ld bc, 12 ; length of string in bytes
Arkanoid - Hit Squad ReleaseInfoseek (and the [URL="ftp://ftp.worldofspectrum.org/pub/sinclair/games/a/Arkanoid(TheHitSquad).tzx.zip"]TZX[/URL] itself) identifies the Hit Squad …
... ]
Searching for the opcode [B]LD IY,$0000[/B ... the same start address and length so it's of no ...Arkanoid Hack - Your Sinclair Smash TipsRemember that Arkanoid hack in YS Smash Tips that didn't work? It does now... [CODE] 10 REM ARKANOID HACK 20 CLEAR 65535: LET C=1: LET D=23295 …
... br /> push bc ; preserve decrypter length
push hl ; preserve ...
cp $f9 ; correct opcode?
jr nz,chksp2 ; no ...
cp $f9 ; correct opcode?
jr nz,dcret ; no ... ),$c9 ; and insert a ret opcode
rundc call dcbuff ; ...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…
... with Thumb any more) fixed length 32 bit instructions. You'll ... 32 bit value, since the opcode and operands won't fit ...Code execution logging/profilingAs revealed in [url="http://www.worldofspectrum.org/forums/showthread.php?t=41666"]this thread[/url], I'm adding support for reading code execution l…
... in hexadecimal" right before the opcode dump. Perhaps you could read ... 's log files, actual full-length examples of such log files ...
