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<1234567…34>
  • [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…

    ... routine (without relying on ROM calls or LDIR) ... (23296) if no ROM calls or BASIC required ... a,BORDER_BLACK ; Select a color.
    ld (SYSVAR_BORDCR),a ... border color. Alternative: call $229B/8859 (Spectrum ROM function to change border color).
    ; ROM ...
    ST1 ST1 November 2018 Development
  • Help needed with MIA software with custom (?) loaderHi, I've got into my hands recently a bunch of Polish educational software which are unknown MIA on WOS. I believe they are protected with some…

    ... OR 02 ; Set Red border (ROM)
    0xEAF1 LD C ... LD A,C ; Get border color (ROM)
    0xEB28 XOR 03 ... LD C,A ; Update border color (ROM)
    0xEB2B LD H ...
    lfaria lfaria August 2016 MIA/STP/SDP
  • TESTROM3 - utility/rom for test your ZXHere is TESTROM3 utility as 16kB ROM file + flasher for install this rom to divide eeprom (or mapram mode). Work also on ZX Spectrum without ROM and …

    ... TESTROM3 utility as 16kB ROM file + flasher for install ... also on ZX Spectrum without ROM and RAM - use ... for ZX Spectrum as 16kB rom image.

    ... work as full transparent rom in divide and user ... (during test sign in border color actual
    tested ZX ...
    velesoft velesoft August 2012 Sinclair Miscellaneous
  • FLASH EPROM programming on ZXExist any other software for rewriting FLASH EPROM or EEPROM chips on real ZX ? I know only: EEPROM flasher for original DivIDE [url]http://85.132.…

    ... di ; interrupt must be disabled (rom will disconnect)
    call $1ffb ...
    out ($fe), a ; set border color

    ld e, l ... url]

    FLASH ROM-diagnostics board
    [url]http ...
    velesoft velesoft July 2009 Hardware
  • Repair 128k +2 grey part2hi all, i am trying to fix it couple of weeks now, i bought a working one for tests and parts check so until now, power TRs are all news memory IC'…

    ...

    i have replace ROM, Z80, ULA, PCF1306 and IC12 ... pixels in the center, and border color is mostly white
    i ...
    xaris_sm xaris_sm April 2013 Hardware
  • Fuse/SPIN vs Spectaculator border timingsHello, I'm trying to figure out at which moments the 48K ULA samples the current border color into its internal latch. To do that I wrote a small …

    ... 48K ULA samples the current border color into its internal latch. To ... few lines on the top border at specific CPU ticks and ...
    kosarev kosarev April 2019 Emulators
  • New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…

    ... be used to set the BORDER color (bits 2, 1 and ... then use a different color than the controlcharacter and ... printed out is contained in ROM starting at address 5010 ... printed is fixed and in ROM, you may end up ... of more use when using ROM routines in a machine ...
    na_th_an na_th_an April 2005 Development
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    ... barely remember something about the border color indicating which bank of RAM ... that would apply to +3 ROM's.

    There's ... use a test ROM chip, that is, a ROM with a test ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • +3 dead(!)Hi, When I turn on my +3 I see only white and black strips (vertical) on screen any idea on how to fix it? Thank you in advance Chris [IMG]http:…

    So the Z80 works. The ROM presumely works. Some code inside ... the ROM has executed a DI, then ... there any place at +3 ROM in which a HALT is ... loop, just after changing the border color according to the faulty bank ...
    mcleod_ideafix mcleod_ideafix September 2009 Hardware
  • Someone can help me to fix my Zx Spectrum?I did a video about the startup: [url]http://dl.dropbox.com/u/1566495/ZXSPECTRUM03.mp4[/url] I have replaced the ULA with a working one (same proble…

    ... things the ROM routine does is to turn the border color to white ... the instruction that puts the border white.

    I ... . With that condition, the border color is whatever value were stored ... will be executed and the border color will change.

    ...
    mcleod_ideafix mcleod_ideafix March 2010 Hardware
  • 'Hello World' in ASM ?Can someone show how to make the classic 'Hello World' print with ASM code ? I cant figure at this moment how to insert and handle strings with the s…

    ... is easier to change the border color just by out (#fe),a ... , and change screen color just by filling memory, like ... fastest way, but faster than ROM routines anyway):

    [code ...
    Shiru Shiru June 2010 Sinclair Basic
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... br />
    Is the border color always the same?
    < ... boots first with the 128K ROM (ROM 0).

    ... to boot from the 48K ROM (ROM 1)?

    ... Easy: the +2 ROM is socketed (or at least ... modding performed to the ROM and replace the damaged ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Broken +3I have noticed that some members on this forum prefer to repair Spectrums instead of just buying another one from ebay. I would like mine fixed at so…

    ... will hang, with a random border color, and random pattern on ... /> - The computer turns the border color into white and hangs : that ... border color, then it's either a faulty Z80, or a faulty ROM ... If the computer turns the border color into white and hangs, AND ...
    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • Japan Tsunami AppealAs some of you will be aware, I've been tinkering with an open source version of SE Basic that could be distributed with hardware without infringing …

    ... with OpenSE ROM. it works, but i can see a 'border stripes ... or so on the border, the 'main' border color is not changed). is ...
    Ketmar Ketmar May 2011 Sinclair Basic
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... with future hardware the Spectrum ROM always reads from port ... My comment: So, even if ROM reads only from one particular ... force software other than ROM monitor program to obey ... 0xFE, among other things, identifies border color (three least significant bits). ...
    PeterP PeterP August 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... 0xFE, among other things, identifies border color (three least significant bits). So ... keyboard handling routine written in ROM, not me. Still, when I ... keyboard handling routine written in ROM do?

    Thanks for ...
    PeterP PeterP August 2011 Emulators
  • writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…

    ... the screen (main window, not border) and they disappear when any ...
    PeterP PeterP August 2011 Emulators
  • Just bought a Spectrum+. Doesn't work. Red bars on screen.Hi all, Something of a noob here. Having recently been on holiday, I came across a Spectrum+ in a box, with a collection of games in a shop, and, af…

    ... You will see that the border has a certain colour. If ... have menaged to get a border of another colour than ... the reset button. Does the border change to white? If ... then the Z80 and the ROM are most probably OK.
    border color test won't work.
    mcleod_ideafix mcleod_ideafix August 2012 Hardware
  • 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…

    ... how to change the border color using a ROM call... (that and ... commands...[/I]

    BLACK (BORDER 0):
    [code]
    3E00 ... [/IMG]

    PURPLE (BORDER 3):
    [code]
    3E03 ... [/IMG]

    YELLOW (BORDER 6):
    [code]
    3E06 ...
    wibble wibble September 2013 Development
  • coding guruOk I'm looking for a to help me in my quest to do my first proper game. The 80's child in me thinks he can do it, But the 2013 man in me knows zip. …

    ... .
    2: use a rom routine. (print, border color, print at ect..)
    wibble wibble September 2013 Sinclair Miscellaneous
  • What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…

    ... trouble with not using the ROM routines is that devices like ... the code from the original ROM then you really ought to ... (derived from the SAM skeleton ROM):
    [code]; THE 'LD- ... C
    and %00000111 ; preserve border color
    or %00001000 ; set MIC ...
    chev chev October 2013 Development
  • 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…

    ... br /> org 0x2294
    border:
    call find_int1 ; ... defs 96, 255 ; unused locations (ROM 0)
    .endif
    ... /> out (ula), a ; set border color
    rlca ; shift
    ... defs 75, 255 ; unused locations (ROM 0)
    .endif
    ...
    chev chev October 2013 Development
  • 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…

    ... defs 220, 255 ; unused locations (ROM 0)
    .endif
    ... /> ld (bordcr), a ; set BORDER color
    ld (attr_p), a ; ... :
    call mode_switch ; ensure ROM 1

    org ... :
    call mode_switch ; ensure ROM 0

    org ...
    chev chev October 2013 Development
  • 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…

    ... defs 21, 255 ; unused locations (ROM 0)
    .endif

    border color
    ld h, a ; and ...
    chev chev November 2013 Development
  • 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…

    ... a, %00001111 ; ROM 0, VRAM 1, ... 1, 255 ; unused locations (ROM 0)
    .endif
    border color to A

    chev chev November 2013 Development
  • I'm writing an Operating SystemOkay this might seem like a bait thread, but I am legitamately interested in figuring out how to write a multi-process system for the ZX Spectrum (no…

    ... have to reuse the existing ROM routines (which you can't ... , like for example make sure Border color is actually swapped. and never ... be to build a new ROM, based on the OLD, that ...
    RMartins RMartins July 2016 Development
  • ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…

    ... faking boot.
    If the ROM does not have an interrupt ... , to allow to see debug border color, which made this issue apparent ...
    RMartins RMartins October 2016 Hardware
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... screen pattern seen when ROM is disabled came from ... br />
    - Disabling the ROM by connecting lower pin 3 ... , but does change the border color, most often to red ... .6V.

    - The ROM and the Z80 get a ... me think that the ROM was faulty. The ULA ...
    Mikelone Mikelone April 2017 Hardware
  • New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…

    ... been executed a Halt, inverting border color
    -When enabling step mode ... to load a .rom file as a custom rom file for the ...
    Luzie Luzie July 2022 Emulators
  • New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…

    ... been executed a Halt, inverting border color
    -When enabling step mode ... to load a .rom file as a custom rom file for the ...
    Luzie Luzie August 2022 Emulators
<1234567…34>

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