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<1…19202122232425…34>
  • Challenge: Make a Speccy version of "Leisure Suit Larry 1"and put it on this site as a rom c'mon be nice!

    ...
    LD A,255
    SCF
    JP 1366[/CODE]
    zxbruno zxbruno August 2010 Development
  • Challenge: Make a Speccy version of "Leisure Suit Larry 1"and put it on this site as a rom c'mon be nice!

    ...
    LD A,255
    SCF
    JP 1366[/CODE]
    Fikee Fikee August 2010 Development
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... like DEC B affect the flags.

    You could DEC ...
    joefish joefish August 2010 Sinclair Basic
  • Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…

    ... ) sets the Z (and other flags). The LD instruction never affects ... the flags.

    There are ways ... 8-bit DEC does affect flags as does OR
    JR ...
    BloodBaz BloodBaz August 2010 Sinclair Basic
  • 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

    ... jumps on status of the flags to handle conditions

    Dr BEEP Dr BEEP September 2010 Development
  • 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

    ... register and set various flags according to the result ... does just set the flags - the actual value ... (Z) and 'Carry' (C) flags are most relevant.
    If ... jump based on these flags with commands like JR ... which instructions set these flags on their own, and ...
    joefish joefish September 2010 Development
  • Pope coming to BritainThe Pope is coming to Britain tomorrow. Anyone care?

    ... Party with their little Saltire flags....and I had to stop ...
    deadpan666 deadpan666 September 2010 Chit chat
  • 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…

    ... , clearing the Z and C flags for example.
    6) You ...
    BloodBaz BloodBaz September 2010 Chit chat
  • 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…

    ... . Have you thought about a Flags register? A vital part of ...
    BloodBaz BloodBaz September 2010 Chit chat
  • 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…

    ... and the use of traditional flags like carry (which was explicitly ...
    AndyC AndyC October 2010 Chit chat
  • Help! Reverse engineering a Spectrum game[deleted]

    ... to monitor variables, program modes/flags and other information that the ...
    ASM ASM October 2010 Development
  • The most rare games?Found a whole stack of games recently up in the loft & wondered what games that go up for sale on ebay get the most cash? will work my way through t…

    have you got any chequered flags? down to my last dozen.
    jdanddiet jdanddiet October 2010 Games
  • scrabble, make a chip[url]http://cgi.ebay.co.uk/ZX-SPECTRUM-CLASSIC-SINCLAIR-5-GAME-BUNDLE_W0QQitemZ300479432109QQcategoryZ112866QQcmdZViewItemQQ_trksidZp4340.m506QQ_trkp…

    If I hadn't just splashed out on a job lot of Chequered Flags and Psion Chess's I probably would have a go at that bundle.
    jdanddiet jdanddiet October 2010 Sales
  • 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…

    ... /> 2. Without carry and zero flags how do the conditional jumps ... work? The flags you originally mentioned seem a ...
    Matt_B Matt_B October 2010 Chit chat
  • 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…

    ... .

    There are four flags that connect to a 4bit ...
    Robin Robin October 2010 Chit chat
  • 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…

    ... />
    [quote]There are four flags that connect to a 4bit ...
    Matt_B Matt_B October 2010 Chit chat
  • The Programmers Development System (PDS)Hi everybody, I recall this system has been mentioned several times on WoS forums. Last time was, I think, when those sources from Maz Spork (Buggy …

    ... , just word sized character codes+flags for palette selection, X/Y ...
    ASM ASM October 2010 Sinclair Miscellaneous
  • Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…

    INC (HL) sets the flags the same way INC A ... back just to check the flags. But in this case you ...
    Patrik Rak Patrik Rak October 2010 Development
  • Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…

    ... in HL right

    SCF
    CCF ;carry=0 so ...
    Ralf Ralf October 2010 Development
  • Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…

    ... ;486028]INC (HL) sets the flags the same way INC A ...
    Rickard Rickard October 2010 Development
  • Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…

    ... ;486028]INC (HL) sets the flags the same way INC A ... back just to check the flags. But in this case you ...
    Patrik Rak Patrik Rak October 2010 Development
  • Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…

    ... how each instruction affects the flags, you can't expect to ...
    Patrik Rak Patrik Rak October 2010 Development
  • Rotating Register PairsWhat's the best way to rotate left (or right) a register pair, so that (eg.) FE76 becomes E76F (or 6FE7)? I presume that passing the intermediate bit…

    [QUOTE=Ralf;486029]
    [CODE]
    SCF
    CCF ;carry=0 so the new leftmost bit will be 0
    [/CODE]
    [/QUOTE]

    BTW, it's faster to use just OR A to achieve this.

    Patrik
    Patrik Rak Patrik Rak October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... following parameters:

    Mode flags (1 = active / 2 = alive ... 128 = visible) etc.
    Collision flags (1 = can be killed / ... paramaters:

    scroll flags (1 = track player one / ... position, direction volocity and flags. This step would be ...
    ASM ASM October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ...
    CMP = Compare and set flags
    DWORD = 32BITS
    WORD ...
    ASM ASM October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... and then sets the condition flags
    AND - AND logic with ...
    Robin Robin October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... command.
    No need for flags as branching does the compare ...
    ASM ASM October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... , and r29 as a status flags register)
    * If I can ...
    Winston Winston October 2010 Development
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... and many clever uses of flags was just a dream!!! I ...
    ASM ASM October 2010 Development
  • 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…

    ... and then sets the condition flags
    0011 AND - AND logic ...

    There are two flags, Z and NZ, zero and ... might still add three more flags, less than, equal and greater ...
    Robin Robin October 2010 Chit chat
<1…19202122232425…34>

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