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<1…23242526272829…34>
  • 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…

    ... you think it through, an instruction that did LD A,(PC ... end up putting whatever the instruction code for LD A,(PC ... you use (in a three byte instruction, for example, there are four ... after having read the third byte) and the fact that it ...
    AndyC AndyC September 2013 Development
  • 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…

    ... you think it through, an instruction that did LD A,(PC ... end up putting whatever the instruction code for LD A,(PC ... you use (in a three byte instruction, for example, there are four ... after having read the third byte) and the fact that it ...
    wibble wibble September 2013 Development
  • Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…

    ... timing figures associates with each instruction - ie M Cycles. T States ... stuff like border effects or multi-color (updating attributes while the ...
    chev chev September 2013 Sinclair Miscellaneous
  • Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…

    ... ?[/QUOTE]

    A Z80 instruction is composed by one or ... ) M cycle (M1) corresponds to instruction fetch from RAM and takes ... 3 T cycles and simple peripheral input/output operation takes 4 ...
    TK90XFan TK90XFan September 2013 Sinclair Miscellaneous
  • Z80 Assembler for Win7 PC (64-bit)Does anybody know where I can get a decent Z80 assembler that will work on my 64-bit Win7 PC? I tried the first one in the WoS utilities and it would…

    ... followed by a byte that is not an instruction that can use ...
    David Jones David Jones September 2013 Development
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... see how it responds to multi-color where the attribute is ... the attribute byte is changed which conflicts with what the multi-colour ... be an option to allow multi-colour games to be played ...
    Basher Basher September 2013 Hardware
  • 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…

    ... code block is the 27361 byte version[/QUOTE]

    In ... version, address 46226 contains this instruction:

    [CODE]46226 ld ...
    Einar Saukas Einar Saukas September 2013 Development
  • Clashbasher a new interface to reduce colour clashI've been working on this for a while now. [IMG]http://markamy.uwclub.net/cauldron.JPG[/IMG] Basicly its an add on for a 48k spectrum, which reinte…

    ... there to capture the second byte of double write z80 op ... the cog with a byte for each attribute byte then the display ... I have noticed that one instruction wouldn't set the z ...
    Basher Basher September 2013 Hardware
  • Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…

    ... memory map:

    Each byte is:
    // bit 0 -> ... code is is on an instruction boundary
    // (start of an ... instruction)
    // bit 2 -> Set ...
    Jon Needle Jon Needle September 2013 Development
  • Finders Keepers+I know a few of you are interested in this project so I thought it was about time I started a proper thread for it rather than just slipping bits int…

    ... memory map:

    Each byte is:
    // bit 0 -> ... code is is on an instruction boundary
    // (start of an ... instruction)
    // bit 2 -> Set ...
    David Jones David Jones September 2013 Development
  • Assembly - Loops bigger than 255Hi, It looks like it's a bit difficult to make loops with more than 255 cycles on Z80 machine code, since the 16-bit decrements (DEC) do not alter a…

    ... in HL: use the CPI instruction, which performs a comparison with ... memory looking for a particular byte value, but if you ignore ...
    gasman gasman October 2013 Development
  • computer nerds - is there a way to do this?copy (in text form) the title of every file in a certain folder on your desktop, so you can paste the list into a word document. Instead of methodi…

    ... necessarily have to compare every byte, they could just compare file ... that kind of logic to multi-terabyte hierarchical systems that have ...
    AndyC AndyC October 2013 Chit chat
  • SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…

    ... dec hl ; point to first byte
    ret ; end of ... /> inc a ; counter next instruction

    org 0x3521 ... ld a, 0xff ; sign byte
    jr sign_to_c ; immediate ... (hl), a ; zero fifth byte
    pop hl ; unstack ...
    chev chev October 2013 Development
  • IF EXIST?In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not. There are any way to check it out from BA…

    [QUOTE=Zup;730789]In MS-DOS scripting, there is an IF EXIST command that lets you check wether a file exists in disk or not.

    There are any way to check it out from BASIC (without breaking the program if it does not exist)?[/QUOTE]

    ...
    The_Bert The_Bert October 2013 Sinclair Basic
  • Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…

    ... haven't. There was a multi-color tile engine before Bifrost ... attribute immediately after each bitmap byte, why don't you store ... and instead the attribute byte and bitmap byte are dealt with as ...
    chev chev October 2013 Development
  • Getting aquainted with the IF1bisToday, fifteen days after dispatch, the IF1bis arrived at my door. In perfect order. No customs, no TVA and no handling fee involved. The arrival of …

    ... microcontroller PIC18F47J53, and this peripheral controller (as it is ... port addresses for 'Peripheral Data' and 'Peripheral Status' plus the ... fact that bit 6 of the 'Status' byte ... command block (4) to peripheral
    20 OUT 159, ...
    roko roko October 2013 Hardware
  • z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…

    ... br /> * memset() creates a 257-byte table of 0xd4 bytes at ... /> * bpoke() pokes a z80 JP instruction at the ISR address (0xd4d4 ... isr right after that JP instruction

    Every interrupt ... /> You're poking an 'EI' instruction followed by some unknown bytes ...
    Alcoholics Anonymous Alcoholics Anonymous October 2013 Development
  • Documentation for SP1 for Z88DK?(I was going to post in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=11729"]the other thread[/URL], so if a mod thinks this should go…

    ... to get the most significant byte of a negative number. It ... '#' was to make sure the instruction wasn't misinterpretted as a ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Development
  • Clear the screen from assemblerI want to clear the screen before I draw my graphic elements on it. Speed is not important so I was thinking of using the rom CLS option if that is p…

    ... a buffer with the same byte value (in a)

    instruction? Can't remember. If you ...
    Paradigm Shifter Paradigm Shifter November 2013 Development
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... RETI instruction and that capability is built into the standard z80 peripheral ... effects of executing a privileged instruction (externally, you cannot stop an ... in-progress instruction from executing, only react to ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • idea: new gaming interface for ZX Spectrum (48k)First of all, I am not an expert this is just an idea of what I would like to see happening in the modern era of the ZX Spectrum. A compact, small, …

    ... the AVR started executing a multi-cycle instruction, your ISR might not ...
    Winston Winston November 2013 Hardware
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... be to use an RST instruction take the place of what ... that it's a 1 byte instruction and trivial to decode).
    Winston Winston November 2013 Sinclair Miscellaneous
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... be to use an RST instruction take the place of what ... that it's a 1 byte instruction and trivial to decode).[/QUOTE ...
    chev chev November 2013 Sinclair Miscellaneous
  • Converting an integer arbitrary large binary number into a printable decimal formThis was asked a long ago at the comp.sys.sinclair newsgroup. At that time, I came up with a solution by extrapolating the classic algorithm of suces…

    ... half carry flag and some instruction to decimal adjust after an ... Z80 does have the DAA instruction to correct an addition after ... store 0-99 in a byte instead of 0-255.
    instruction to roll or shift 4 ...
    Paradigm Shifter Paradigm Shifter November 2013 Development
  • Spectrum CP/MHello.. Just out of curiosity, has anyone actually used +3 CP/M for any practical purpose? I remember booting it up a couple of times years ago, jus…

    ... was doing, that is one byte). I also had a dirty ... be to use an RST instruction take the place of what ... that it's a 1 byte instruction and trivial to decode).[/QUOTE ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Sinclair Miscellaneous
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... with JR will save a byte but it can make your ... worth mentioning that any JP instruction, whether it's conditional or ...
    The_Bert The_Bert December 2013 Development
  • Assembly code auto optimiserFor my Finders Keepers Plus project I'm considering writing an Assembly code auto optimiser. Way back when I wrote the original FK I considered optim…

    ... exactly that - simple byte code interpreter executing one instruction per frame.
    Instruction set is limited to ...
    catmeows catmeows December 2013 Development
  • Get rid of 'Bytes:' when loading codeHow do you hide the 'Bytes:' when loading code? I've tried saving as CHR$ 22 + CHR$ 6+ CHR$ 0 (a blank part of the loading screen) but it still appe…

    ... ROM.
    Changing the low byte to 111 gives the address ... which corresponds to a RET instruction, hence the current channel's ...
    u6c87 u6c87 December 2013 Sinclair Basic
  • Z80: ABS(HL) functionI must be very tired but I cannot get my head around whether this function provides a correct implementation of a ABS function for a signed 16-bit va…

    ... saves 6 cycles and 1 byte compared to the CPL+INC ... or do not affect. The instruction set always seems to get ... from experience with mainframe cpu instruction sets that came before the ...
    Alcoholics Anonymous Alcoholics Anonymous January 2014 Development
  • 128k gamesHi. I've come to World of Spectrum for advice. I'm a Commodore guy OK, please be nice to me, as I seek your wisdom! I love the Commodore 128, and I'…

    ... all in the same control byte.

    Another problem is ... quick - just a single OUT instruction - so you could use a ...
    joefish joefish January 2014 Games
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