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  • analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …

    ... an emulator with a modified ROM file with a patch in ... already has an error trap routine anyway), count the reference and ... slotted in by the LET at (E_LINE)-1 and (VARS) will ...
    Battle Bunny Battle Bunny July 2014 Sinclair Basic
  • Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…

    ... ];Taken from The Incomplete Spectrum ROM Assembly
    ;http://www ... ZX Spectrum. My intention was at first, to include this ... this C64 arrangement makes the routine to calculate the screen ... than the original ULA layout, at least for displaying characters ( ...
    mcleod_ideafix mcleod_ideafix September 2014 Development
  • 404 for Retroleum's daignostic ROM: Request.[url]http://www.retroleum.co.uk/electronics-articles/a-diagnostic-rom-image-for-the-zx-spectrum/[/url] I'm getting access denied when I try to downl…

    ... .uk/electronics-articles/a-diagnostic-rom-image-for-the-zx-spectrum ... try to download the Diagnostic ROM, I've just emailed the ... it somewhere I could get at it, pretty please :)
    Korinel Korinel October 2014 Hardware
  • Ensure my interrupt handler begins at the same T-stateHi! Is there a way to ensure that an IM 2 interrupt handler starts always at the same T-state (related to the moment the ULA triggers the INT line, w…

    ... 2 interrupt handler starts always at the same T-state (related ... far, I've made my routine to last a number of ... get by now is my routine starting at cycle 19,20,21 ...
    mcleod_ideafix mcleod_ideafix November 2014 Development
  • Destroyed my ROM. Need a new one...I was messing around with my 48K rubberkey's ROM trying to read its contents with the programmer we have at work but in my haste and excitement I mad…

    ... with my 48K rubberkey's ROM trying to read its contents ... with the programmer we have at work but in my haste ... have ended up blowing the ROM up *[i]hangs head in ...
    namtip namtip August 2015 Hardware
  • Searching for correct Betadisk 48k TR-DOS v4.12 ROM (Save ROM via TRDOS-Prompt to Disk)Hi, I have two ROM-Files which should be read out from an original Betadisk 48 Interface TRDOS v4.12 (ROM-Size 8k). But when I compare them, they…

    ... are different in six Bytes at: 113B, 1ABD, 1BB2, ... br />
    First ROM has Checksum: SHA-1: C8BAAEF66AB7FBF457BA76B783C02434CC5E2130 ...
    Second ROM has Checksum: SHA-1: ...
    Luzie Luzie September 2015 Hardware
  • 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…

    ... /> Custom ROM in ROM-A
    DRAM in ROM-B with ... in More Detail
    --------------------------
    ROM:

    ROM0 - BIOS ... quickly test the ROM.
    This was invaluable at the time: ... and optimized the FAT seek routine (which was hard work), ...
    bverstee bverstee October 2015 Hardware
  • 48K Issue 3B ROM to EPROM methodsHi folks, While fixing up a completely dead Commodore PET I needed a way of testing the 4116 RAM chips that make up its 32K, some googling found a…

    ... the 48K ROM and a diagnostic ROM from Paul Farrow over at Fruitcake ... 've found of doing the ROM - EPROM replacement, either the ... diags.

    Sanity check ROM burner (MQP Pinmaster 48) by ... reburn the 27c256 with stock ROM (previous attempt had been with ...
    witchy witchy December 2015 Hardware
  • Text scroller and custom fontYesterday I was testing this text scroll routine taken from Jonathan Cauldwell's Intro Maker (labels have been inserted to allow partial code relocab…

    ... was testing this text scroll routine taken from Jonathan Cauldwell's ... displays characters in the standard ROM font, while I would like ... this example has been memorized at 64000.

    I ... 20575 ; message will be displayed at this height
    PUSH HL ...
    Alessandro Grussu Alessandro Grussu January 2016 Development
  • Faster Manic MinerHey, dudes. I've been fiddling around trying to wring more speed out of this game recently. I've replaced the LDIR buffer copying routines with s…

    ... or so in RAM starting at 37708 in the address space ... . I used a POP-PUSH routine for the pixel buffer and ... , I suppose, replace the BASIC ROM with a custom one with ...
    Mysterion Mysterion May 2016 Development
  • So it occurred to me; "Why bother with going into 48K BASIC when you can just....wrap the machine code calls inside a 'RST #28;DEFW addr:RET'?" Of course, you DO need a small M/C routine to do that, and ta-daaa, here it is: [cod…

    ... Call48 RST #28 ; call a routine in the 48-BASIC environment ... (addr),BC ; store the value at 'addr'
    RST #28 ; ... stack before calling my 'interface routine'
    Since all 128K ... routines in the 48-BASIC ROM, there is no need ...
    The_Bert The_Bert September 2016 Sinclair Basic
  • Startup colours of the Spectrum ROMHi Folks, Thought I would have a go at changing the startup colours of the Spectrum ROMs used within BasinC which ships with 48.rom (16384 bytes) …

    ... ships with 48.rom (16384 bytes) and plus2.rom (32768 bytes). ... Looking in the Complete ROM Disassembly I made the following ... 48.rom file I changed:

    1. The value at offset ... plus2.rom file I changed:

    1. The value at offset ...
    Paddy Coleman Paddy Coleman October 2016 Development
  • CAPS-SHIFT KeyCodeIs there a standard Keycode for CAPS-SHIFT Key ? Looking at the ROM documentation in the Main key table KEYTABLE_A, there is no Entry for CAPS_SHI…

    ... Key ?

    Looking at the ROM documentation in the Main key ...
    http://skoolkid.github.io/rom/asm/0205.html

    Looking at the keyboard routine K_DECODE
    http://skoolkid.github.io/rom/asm ...
    RMartins RMartins October 2016 Development
  • Wanted - Space Raiders ROM CartridgeI keep an eye on eBay and there's a Space Raiders ROM cartridge up for sale at the moment, but I don't think it's worth £70 for such a tatty box. …

    ... a Space Raiders ROM cartridge up for sale at the moment, but ... . [i]JetPac[/i]), but I at least have all the boxes ...
    joefish joefish March 2017 Wanted
  • Spectrum Use for ZX81 Pseudo Hi-ResHi Folks, I've been looking around at some of the "Hi-Res" stuff which was achieved on the ZX81 and I came across the faq https://www.landley.net/…

    ... 've been looking around at some of the "Hi ... an extremely hairy interrupt routine that replaced the ... s usual display update routine. Basically, it pointed ... register to a strategic ROM location, and tried to ... br /> You still could, at best, only have 128 different ...
    KrazyKattapilla KrazyKattapilla April 2017 Assembler
  • New ZEsarUX 5.0Hi! ZEsarUX 5.0 is out! :) You can download it from the URL: https://sourceforge.net/projects/zesarux/ Finally I have succeded emulating Si…

    ... lots of dissassemblies of the ROM and testing keyboard to know ... contents
    Added autosave snapshot at fixed interval
    Added hardware ...
    Fixed text to speech routine when sending non-ascii character ...
    chernandezba chernandezba April 2017 Emulators
  • im looking for a horizontal scroll routinehi, im looking for a horizontal scroll routine. i read somewhere that you can do it with at 'to' statement, somewhere in a print routine. althoug…

    ... looking for a horizontal scroll routine. i read somewhere that you ... it with at 'to' statement, somewhere in a print routine. although i ...
    digital digital June 2017 Sinclair Basic
  • ROM emulation in softwareHi, first of all -- I only have shallow / uni knowledge of hardware, electronics, and physics. So forgive me for asking things that are out of that …

    ... .
    A simple PIC microprocessor at 80 Mhz can execute an ... 20ns. But the ZX Spectrum ROM chip timing shows that its ... to somehow wire ZX Spectrum ROM slot to some fast PC ... feed read the ZX Spectrum ROM address and feed it data ...
    tstih tstih June 2017 Hardware
  • How to automatically find the character set in a gameThis is all completely new to me, so please be patient. I've done some reading up on how character sets are handled by the Spectrum. I understand tha…

    ... that there is an address at 23606 and 23607 that points ... to an area of the rom by default and which contains ... still points to the classic rom address even though it clearly ... use their own character printing routine (putchar?) instead of using the ...
    morph morph June 2017 Development
  • I think maybe I'll try my hand at making a game like Boggle next.Or maybe a sliding puzzle sort of thing? Although its a royal pain working out all those symbolic characters, its kind of rewarding when it works af…

    ... and use a cursor move routine to position the tile - if ... a bit ambitious for me at the moment, would be a ...
    mik3d3nch mik3d3nch July 2017 BASIC
  • Afterburner rom showing sound options in 48K mode?I am running an [i]Afterburner (1988) (Activision)[/i] rom (which I can't remember where I got it from) that shows the music or sound effects choice …

    ... [i]Afterburner (1988) (Activision)[/i] rom (which I can't remember ... music or sound effects choice at the beginning in 48K mode ... . However, there is no sound at all, even if the choice ...
    Renegade Renegade July 2017 Games
  • High score table routineI wrote this general purpose high score table routine. It stores 5 scores and displays them alongside the player names, which are 8 characters long. …

    ... general purpose high score table routine. It stores 5 scores and ... in A is stored at the address pointed at by HL
    RET ; exits the routine

    PRINTNUM: ; routine by J. Cauldwell
    Alessandro Grussu Alessandro Grussu July 2017 Assembler
  • Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…

    ... Speccy with a dual boot ROM loading on first bank the ... modified already the welcome message at the prompt with an hex ... the border and paper colour at startup or any other nice ... do I need to look at?
    Thanks,
    Rick
    repetto74 repetto74 November 2017 Hardware
  • Restoring AY registersAfter doing (not still finished) the sna to tap converter, I'm going to try to do the same for 128k snapshots. I've got threee ideas about what to do…

    ... embedded) a machine code routine that does the following steps ... on the screen with the routine that restores them. They ... can be simultaneous. The routine placed at 16384 loads a headerless ... /> - In 48k ROM, there are an interesting routine at address 7805: an ...
    Zup Zup April 2018 Development
  • [Asm] Is this nested loop faster than LDIR or a bunch of unrolled LDI's?Hi all. I'm learning Z80 asm on Speccy 48K, and to start with I decided to write my own "CLS" routine (without relying on ROM calls or LDIR) as a lea…

    ... my own "CLS" routine (without relying on ROM calls or LDIR) as ... Alternative: call $229B/8859 (Spectrum ROM function to change border color ... ).
    ; ROM CLS = call $0DAF/3503
    at the source of a game ...
    ST1 ST1 November 2018 Development
  • Z80onDSK now compatible with +3e with ZXMMC or similarJust updated my utility to work on Spectrums equipped with +3e ROMs and IDE storage. I've tested this with ZXMMC at the moment but don't think there …

    ... 've tested this with ZXMMC at the moment but don't ... do not add autorun basic routine to disk, useful if you ... add
    ║ your own loader routine later
    ║ -h: make the ... off &
    ║ original Sincliar ROM patched in. Note this causes ...
    TomD TomD May 2019 Sinclair Miscellaneous
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Latest Posts

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HitBox

Word Docs Hits
rom 15.6K 29.7K
at 189.3K 276K
routine 9.5K 14.8K

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