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<1234567…34>
  • harvard architecture spectrum clone.I got my first +2 before christmas. I'd never given the 128k spectrums much thought, always been a 48k rubber key tradionalist. :smile: I've been me…

    ... logic for some of the multi byte indexing instructions that possibly have ... call, ret, push or pop instruction then this bank would be ...
    Basher Basher January 2014 Hardware
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... the interrupting peripheral is expected to supply an instruction for the ... Z80 to execute. Usually this is a single-byte ... RST instruction that performs a ... points at a 256 byte table containing interrupt service ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 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…

    ... address $d4d4 a jump instruction to your isr. What ... the table and 3-byte JP instruction, the table must ... start on a 256-byte page ... to poke a 3-byte JP instruction so the z80 ... expecting an 8-bit peripheral ID when an interrupt ...
    Alcoholics Anonymous Alcoholics Anonymous November 2013 Development
  • Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…

    ... in the middle of a multi-byte instruction will interpret everything incorrectly (until ... 62999 rather than 63000, the byte at 62999 (presumably one of ... of an instruction and the first byte of your first instruction is being ...
    AndyC AndyC August 2017 Development
  • Raster effects - quick questionHi Guys Just a quick question regards what the ULA is doing as its drawing each scan line. Assuming the beam has finished drawing the border, am I…

    ... e.g. a PUSH instruction can write two bytes ... can only write one byte every 8T. So for ... tick in a multi-T-state instruction the read or ... example) during a 10T instruction, the processor will complete ... that instruction before activating the ...
    joefish joefish August 2019 Development
  • Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …

    ... address of the new 3072-byte attribute table.

    ... br /> ;Copy the sample jump instruction there,
    ; to jump ... br /> ld hl,sample_jump ;Sample instruction (see below)
    ld ... /> ldi ;Copy the 3-byte jump instruction
    ldi
    ldi ...
    joefish joefish May 2009 Development
  • There's a bug in my Speccy, Dear Liza, Dear Liza...Hi guys, Just me being annoying again - Can anyone out there in 'Internetland' help me with ideas about what could be causing a bug in my Speccy em…

    ... I rewrote the basic, one byte type instruction side - you know, NOP ...
    Speculator Speculator December 2004 Development
  • Z80 assemblerIf I do this [code] LD BC, 0002h [/code] is B=0 and C=2, or the other way around? does it disassemble to 01 00 02 does it disassemble to 01 02 00

    ... loaded with the most significant byte. In LD BC,$0002 $ ... completely separate issue is how multi-byte quantities are stored in memory ... little endian. The least significant byte $02 is stored in the ... location and the most siginificant byte is stored at the next ...
    Alcoholics Anonymous Alcoholics Anonymous December 2009 Chit chat
  • Z80 Processor Interupt helpHi everyone, Currently designing a Z80 computer and i need a little help with these interupts. If i have an I/O device that sends a pulse to the int…

    ... instruction and will be executed. Normally, the instruction will be a one byte ... restart instruction.
    - IM ... a RST instruction, which is actually a one byte CALL instruction, so the ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • Question about DivIDEHi guys, Tell me this... (please) DivIDE features an "auto-mapping feature transparently maps shadow ROM at important entry points". Depending on …

    ... />
    If CPU read instruction from one of this adress ... :
    CPU read first byte if instruction on adress #0562, divide ... />
    If CPU read instruction from area #3D00-#3DFF then ... /> Example:
    CPU read instruction byte from adress #1FF8, after it ...
    velesoft velesoft June 2011 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... to be:
    Fetch first byte of instruction
    Page ROM
    Execute instruction

    ...which could lead ... trap. It's the last byte of CALL $0074!

    Jmk Jmk April 2013 Hardware
  • Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…

    ... to be:
    Fetch first byte of instruction
    Page ROM
    byte of the instruction that is fetched to ... jump to that last byte of the instruction directly, as though it ... were the first byte of an instruction. The byte at this address ...
    zub zub April 2013 Hardware
  • Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…

    ... the expense of the extra byte and the ease of relocation ... jr to save the extra byte of instruction stream.

    However ...
    u6c87 u6c87 August 2013 Development
  • ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …

    ... [LIST][*] Instruction [B]LDI[/B] writes a single literal byte to output ... simply return this byte instead.


    [*] Instruction [B]LDIR ... state and return a single byte. Next invocation should check ... need to access a byte that was extracted "up ...
    Einar Saukas Einar Saukas January 2014 Brand new software
  • DivIDE allram mode help neededHi guys, are there any DIVIDE wizards out there that can explain how i page in the allram and add a rom file to it i sometimes need to load spect…

    ...
    call 15616 ;write byte 201(instruction RET) to mapping address and ...
    velesoft velesoft March 2017 Sinclair Basic
  • Dynamite Dan disassemblyOkay, I got fed up of going through the frankly arcane Technician Ted code (which is clearly designed for speed, space and elegance, and balls to rea…

    ... ? Evaluating 16-bit (or any multi-byte) numbers becomes non-trivial, and ...
    Ritchie333 Ritchie333 January 2019 Assembler
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... addresses - or both. If the peripheral we're talking of just ... in just a couple of multi-input gates or magnitude comparators ... looking for will indicate an instruction fetch. Most logic families are ... any address in the 256-byte block from $3D00-$3DFF.)
    zub zub November 2007 Hardware
  • Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…

    ... INC HL. This should put byte $23 at the address. Now ... edit selection -> mark as byte data. The line now changes ... now freeze at the HALT instruction because no interrupts are occurring ... , and make sure the Multiface peripheral is ticked. Enter 128 basic ...
    Jimmy Jimmy April 2008 Emulators
  • 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…

    ... bpoke(0xd4d4, 195); // POKE jump instruction at address 0xd4d4 (interrupt service ... we'll be running in multi-task mode

    // ... ld i,a ; set high byte.
    im2 ; select interrupt mode ...
    slenkar slenkar October 2013 Development
  • ZX-Assembler version 0.8 (beta) releasedDear readers, yesterday I've published ZX-Assembler in its first version 0.8. It offers you some interesting features, even if I know there are …

    ... edit the file directly with byte editor.

    ... * Icons to separate a multi-instruction command line (commands separated by ...
    commands to a multi-instruction command line.

    * IFUSED instruction which works pretty much like ...
    clausjahn clausjahn July 2015 Emulators
  • The history of ESXDOS, the DivMMC and the DivMMC EnJOY![img]http://benophetinternet.nl/hobby/divmmc_history/1%20esxdos.jpg[/img] These are the stories behind esxDOS, the most popular operating system e…

    ... V6Z80P+ is a FPGA board [multi machine emulation board], and Alessandro ... the CPLD.
    Transferring a byte to/from the card requires ... a single OUT or IN instruction, which takes 16 Z80 T ...
    bverstee bverstee October 2015 Hardware
  • Which peripheral listened on port $9f from back in 1984 (Chuckie Egg related)Hi Apologies if this is in the wrong section, please feel free to move it to the correct one if so. I've been looking through the Chuckie Egg c…

    ... found an OUT ($9F),A instruction in the middle of the ... wondering whether anybody knew which peripheral (that was available around 1984 ... device.

    The OUT instruction itself is at $9ce0. Pretty ...
    cmonkey cmonkey March 2016 Hardware
  • A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…

    ... [b]ld hl,(sprite_8x8[/b]) instruction.)

    [code]
    ex ... ,(hl) ;load C with first byte
    inc l ;advance to ... next byte (make sure sprite data is ... ;else, load A with high byte of screen address
    sub ...
    Ast_A_Moore Ast_A_Moore February 2017 Development
  • Sync-buzzer, interrupts and general confusionBeen wittering on about this in the Misc group, but thought it was best discussed here. Basically been trying to recreate the Sid-Sound effect from A…

    ... is done by loading the byte addressed by the stack ... the high-order PC byte with the new SP addressed ... byte. Finally, increment the stack pointer again. Notice that this instruction ... before RETI. This instruction is recognized by peripheral devices as the ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... mode 2 because placing an instruction opcode on the bus is ... give the attached peripheral time to place an instruction / vector on ... memory write for the MSB byte.

    The interrupt ... indicator for the highest priority peripheral to place its vector / ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …

    ... />
    RST are fast single-byte calls. The fact they are ... 0. In IM0, the peripheral supplies an instruction to execute when it ... . The RST instructions are one byte which means the logic to ... .

    If the 257 byte table doesn't contain identical ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... attached peripheral that generated the interrupt is expected to supply an instruction ... typically be a single-byte "RST n" instruction that effectively causes a ... a subroutine address of byte*256+byte. Since the peripheral id can be ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... - either using an OUT instruction, or trapping the execution of ... addresses - or both. If the peripheral we're talking of just ... in just a couple of multi-input gates or magnitude ... looking for will indicate an instruction fetch. Most logic families are ...
    Winston Winston November 2007 Hardware
  • InterruptsI need help emulating interrupts. My z80 core currently emulates all un-prefixed opcodes and the CB opcodes. I thought I would start on emulating co…

    ... , in IM0, the interrupting peripheral supplies an instruction on the data bus ...
    address = I * 0x100 + byte supplied by peripheral
    pc = (address)
    peripheral byte is nothing ($ff causes by ...
    Alcoholics Anonymous Alcoholics Anonymous July 2008 Emulators
  • NEC CPU - problem?I wonder if I should substitute a NEC CPU in a grey +2. Does anyone else had problems with NEC CPUs inside ZX Spectrum. Some time ago I had a Spectr…

    ... of Spectrums suffer from. Any peripheral that needs M1 (basically, anything ... traps and needs to detect instruction fetches) won't work properly ... very good for getting out multi-pin devices, and I've ...
    Winston Winston February 2009 Hardware
<1234567…34>

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