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<1…24252627282930…34>
  • DIM DATA and the likeSo...I'm trying to work out arrays in BASIC a bit more and have knocked up the following quick test bed to fiddle about with before trying anything m…

    ... with the bits in a byte using boolean logic
    cp ... the bits sideways in a byte. There aren't any multiply ... and look up the odd instruction I've not mentioned.
    David Jones David Jones January 2014 Sinclair Basic
  • ULA snow effectIt's wintertime, you know. [quote="http://ramsoft.bbk.org.omegahg.com/floatingbus.html"]when the I register falls in the range 0x40-0x7F then the UL…

    ... CAS for the first byte fetch (equivalent to Harlequin ... of CAS for the second byte fetch (Harlequin's AL2 ... repeated for each video byte pair fetched by the ... signal are generated for each byte pair, and bytes are ... low.
    If an instruction fetch state T3 and T4 ...
    antoniovillena antoniovillena January 2014 Development
  • Outputting debug trace to RS232 (assembly)Hi Guys, I'm working on a game at the moment (written in assembly) but I am really needing to write out a debug trace of what is going on with the p…

    ... ) State before running the 1st instruction didn't help either. As ... the same RST 8 instruction rather than 1 byte past the DEFB ...
    BloodBaz BloodBaz January 2014 Development
  • 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 …

    ... thereby skipping to the next instruction which is INC C.
    byte of the nnnn address used ... LD (BC), A (the 2nd byte of the nnnn pair!). The ...
    Arjun Arjun February 2014 Development
  • Questions about SEUDI recently purchased SEUD (Shoot-em-up Designer, for those who do not know it) from Cronosoft and tried to familiarize with it, also by peering into …

    ... levels for a possible future multi-level game.

    Dave ... Z,LOOPLV (202, 167, 187) instruction at that address. You could ...
    jonathan jonathan March 2014 Development
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... /> iteration, a byte is copied. Take that byte and add the ... of info on the byte transfered. might be useful ... are looking for a certain byte?

    But ... longer than just testing written byte directly!

    ... flags like the CPI instruction does.
    Basher Basher March 2014 Development
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... 'm pretty sure that the byte transferred from (DE) to (HL ... that the microcode for each instruction would have been laid out ... blindly run thought the current instruction without making any conditional checks ...
    BloodBaz BloodBaz March 2014 Development
  • Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…

    ... are masked with an extra byte to allow for transparent PAPER ... then there can be a multi-game manager that selects different ...
    joefish joefish March 2014 Development
  • Questions about SEUDI recently purchased SEUD (Shoot-em-up Designer, for those who do not know it) from Cronosoft and tried to familiarize with it, also by peering into …

    ... is just a dummy RET byte in the ROM. It gets ... to patch in a JP instruction at C027 and C036 to ...
    jonathan jonathan March 2014 Development
  • Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…

    ... work as advertised, performing given instruction cycle at the specified T ... it only provides the attribute byte, not also the pixels like ...
    Patrik Rak Patrik Rak March 2014 Emulators
  • Help with 1-bit sampled soundHi all, I've been sent over this way from the CPC Wiki forums as you guys may be able to help me more specifically with a programming query. Firstly…

    ... How about pre-converting each byte into a pulse-density ... Perhaps even repeating the pattern byte, depending on the original ... br /> Or perhaps the sample byte is used to index into ... combine with a high byte to get the table ... of registers and instruction timing.
    joefish joefish March 2014 Development
  • 4294967296 pseudo output portsIn an effort to avoid any hardware conflicts with the clashbasher interface I've been looking for an alternative to using the spectrum's ports for ou…

    ... you want. Executing the instruction then opens the set ... If someone wants to write byte $fe to port $1234abcd ... label2:

    ; write byte $fe

    ld hl ... just waste an extra byte and take longer ... br />
    ; write byte $fe
    defb $dd< ...
    Einar Saukas Einar Saukas March 2014 Hardware
  • 4294967296 pseudo output portsIn an effort to avoid any hardware conflicts with the clashbasher interface I've been looking for an alternative to using the spectrum's ports for ou…

    You wouldn't get the result you were expecting though. The cpld would detect the instruction and the read and write to the same address but would recieve the byte that is fixed in ROM for n rather than the one you tried to poke in earlier.
    Basher Basher March 2014 Hardware
  • 4294967296 pseudo output portsIn an effort to avoid any hardware conflicts with the clashbasher interface I've been looking for an alternative to using the spectrum's ports for ou…

    ... . The cpld would detect the instruction and the read and write ... address but would recieve the byte that is fixed in ROM ...
    Alcoholics Anonymous Alcoholics Anonymous March 2014 Hardware
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... value directly from the next byte of the program, whereas 'LD ... ,(B)', and then does the instruction become 'LD A,((HL))'?... well ...
    zub zub March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... there possibly be an undocumented instruction that does it?[/QUOTE]
    instruction set space to have ... it named 'DAD SP' (Double-byte ADd Stack Pointer). This does ... thinking regarding the 'DAD SP' instruction, as it seems clearly intended ...
    zub zub March 2014 Development
  • JP (HL) confusionokay.... JP nn will jump to memory address nn. JP (HL) ,I assumed would read the contents of memory address HL and jump to the location and be a gre…

    ... A,(BC) ; read map data byte
    LD HL,jumptable ; ... br /> INC L ; to next byte
    LD H,(HL) ; ... (HL) need a PUSH instruction of the next address to ...
    bobs bobs March 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... think of (limitation being 1 byte command). RST nn and HALT ... at the breakpoint with another instruction (such as HALT) as there ...
    zub zub March 2014 Development
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... /ram/srecv115k.s"]Receive a byte at 115.200[/URL]
    byte at 115.200[/URL]
    byte at this speed. So if ... at the breakpoint with another instruction (such as HALT) as there ...
    tstih tstih March 2014 Development
  • the worlds longest game tape ?just curious if there is a known title... as I was looking at multimixx 4 and that has gauntlet 1 / 2 and deeper dungeons and it reminds me of an ata…

    ... a shade over 8 minutes. Multi-loads and compilations surely don ... load but often loaded every byte in 48k RAM, and had ...
    Zup Zup March 2014 Sinclair Miscellaneous
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... the flags indicate if the byte is the same as A ... Z flags like the CPI instruction does.[/QUOTE]

    FWIW ...
    zub zub March 2014 Development
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... same pattern ie the compare instruction has the least significant bit ... increment/decrement DE and transfer byte/update flags.

    That ... the flags indicate if the byte is the same as A ... Z flags like the CPI instruction does. [/QUOTE]

    You ...
    Basher Basher March 2014 Development
  • LDI questionWhen using LDI (or LDD) is it possible to access the value that is transfered from (HL) to (DE), or does the Z80 use an internal data cache to store …

    ... T-states as the CPI instruction isn't having to perform ... fetch opcode
    M3 fetch byte from (HL), increment/decrement HL ...
    M4 store byte to (DE), increment/decrement DE ... fetch opcode
    M3 input byte from (BC)
    M4 store ...
    Jonathan Harston Jonathan Harston March 2014 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…

    ... the interface receives an instruction to save the screen ...
    1. plug buffer: this instruction plugs the output of the ...
    2. bypass buffer: this instruction sends writes to screen directly ... and reorder the display byte and attribute writes so ...
    Basher Basher April 2014 Hardware
  • FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…

    ... /> __endasm;
    }

    byte serial_read() __naked {
    __asm
    byte b) __naked {
    70 ; ... STACK is 84ff. So RET instruction jumps to nowhere. And my ...
    tstih tstih April 2014 Development
  • Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…

    ... if you do an IN instruction with the lowest address bit ... is #EF in the low byte, so you can't use ...
    joefish joefish April 2014 Hardware
  • Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…

    ... data lines to transfer the byte.

    As ... any given byte. This means that each byte of contended ... no 'ADD H, 2' instruction, and it would make ... consider the Z80's instruction set. It also has ... and the Z80's instruction set and DRAM refresh ...
    zub zub May 2014 Sinclair Miscellaneous
  • Optimal shifting for set pixel?Hi, I'm optimizing my set pixel code. For speed. But without using partitioned memory (i.e. a table on 256 byte boundary) I have optimal memory addr…

    Using a lookup table is probably best, but if you really wanted to do it without, you could use self-modifying code.

    Have a [B]SET 0,(HL)[/B] instruction, and modify the last byte from C6 to be (C6 | (x&7)
    Kayamon Kayamon May 2014 Development
  • ZX-Modules app reportZX-Modules app report If You are interested, I want to report about the state and progress about my ZX-Modules programs. I would like to report at l…

    ... , DD, DS and their synonyms (BYTE, WORD, TRIPLE, DWORD, BLOCK, ... . JR !NC, (= JR C,...)
    - multi-commands in one line, separated ... ZX-Assembler would open any byte-based datablock, including SCREEN$ blocks ... already able to open any multi-block file, e.g TAP ...
    clausjahn clausjahn July 2014 Emulators
  • Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…

    ... :

    Key in the instruction:

    PRINT PEEK 23732 ... /> to see what the first byte of the "upper" 32k of ...
    Brian Brian July 2014 Hardware
<1…24252627282930…34>

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