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  • Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…

    ... port #1FFD and later set #7FFD. One of this routines is ... A,#10
    LD BC,#7FFD
    OUT (C),A
    screen and not start...
    But ...
    velesoft velesoft December 2012 Games
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... as "screen raining / snow effect"
    - data of paging port 7FFD are ... if CPU read of port 7FFD (write floating bus data)
    7FFD is also good, but make ...
    velesoft velesoft January 2013 Hardware
  • Memory diagnostic toolIs there any sort of memory diagnostic tool for examining .Z80 files so I can easily identify large areas of blank memory? Scrolling through ZX Spin…

    ... for a key when the screen is full. If you're ... (BANKM),a
    ld bc,$7ffd
    out (c),a
    Battle Bunny Battle Bunny February 2013 Development
  • Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]

    ... port 7FFD is not so big problem as RAINING effect on screen ... often will see raining on screen :-(

    Exist any list ... /software using reading from port 7FFD or 1FFD ?
    velesoft velesoft March 2013 Hardware
  • BIN2BAS (load BASIC text into emulator) utilityI've nearly finished testing this. It allows a BASIC program to be loaded from a text file in any emulator which has a "load binary" option. I was wo…

    ... /> 2 226 ld bc,$7ffd
    2 227 jr ... br /> 1 228 ld bc,$7ffd

    2 372 ... call $26a4 ;switch to lower screen, avoiding CLS
    2 ... $0751 ;ROM0;switch to lower screen, avoiding CLS

    Battle Bunny Battle Bunny April 2013 Sinclair Basic
  • esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)

    ... real ZX - screen raining effect, impossibility read port 7FFD and 1FFD, etc ...
    velesoft velesoft June 2013 Announcements
  • esxDOS v0.8.5 released (with TR-DOS emulator)Yup, you read right! Now with TR-DOS emulation! More info and download here: [url]http://www.esxdos.org/[/url] Enjoy :)

    ... real ZX - screen raining effect, impossibility read port 7FFD and 1FFD, etc ...
    Alessandro Grussu Alessandro Grussu June 2013 Announcements
  • Copying data between memory banks in USR0 modeI am experimenting with Funky Fungus to load the majority of its data (levels, screens, music etc.) into memory banks 1, 3, 4, 6 and (partly) 7 by sw…

    ... do an OUT to port #7FFD to select the bank (LD ... BC, #7ffd; LD A, byte; OUT (C ... /> To copy it to the screen (bank 5) just use:
    screen here so don't want ...
    chev chev September 2013 Development
  • Copying data between memory banks in USR0 modeI am experimenting with Funky Fungus to load the majority of its data (levels, screens, music etc.) into memory banks 1, 3, 4, 6 and (partly) 7 by sw…

    ... 4 reset (0) to port #7FFD then you'll invoke ROM ... copy the contents of the screen to bank 7 and set ...
    chev chev September 2013 Development
  • Atic Atac on 128kThis may have been talked about before, especially if its not just me with this problem, but loading this on my grey +2 results in title screen, then…

    ... be accidentally hitting port 7FFD then, the screen reappearing upon reset is ... the giveaway (screen switching back to screen 0).

    balford balford January 2014 Games
  • Atic Atac on 128kThis may have been talked about before, especially if its not just me with this problem, but loading this on my grey +2 results in title screen, then…

    ... be accidentally hitting port 7FFD then, the screen reappearing upon reset is ... the giveaway (screen switching back to screen 0).

    ASH-II ASH-II January 2014 Games
  • Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…

    ... 128, always treating the screen memory as being at $ ... always ensuring that the screen that's on display is ... you can build up the screen at your leisure, and ... flipping the screen bit (bit 3) on port $7FFD. It's ... keeping one of the screen banks at $C000 that ...
    Marko Marko April 2014 Development
  • 128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…

    loop:
    ei
    halt
    page: ld a ,$17
    xor $0A
    ld (page+1),a
    ld bc,$7FFD
    out (c),a
    ...
    do something with screen
    ...
    jp loop
    g0blinish g0blinish May 2014 Development
  • LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…

    ... ld (23693),a ; set our screen colours.
    xor a ; quick ... /> di
    ld bc,#7ffd
    ld a,#16 ;16 ... ldir

    ld bc,#7ffd
    ld a,#10 ;16 ...
    Jerri Jerri October 2014 Development
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    I get the same blank screen on my +2 (grey). When ... IN from port #7ffd causes the shadow screen to be displayed.
    zub zub September 2015 Hardware
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    ... "]I get the same blank screen on my +2 (grey). When ... IN from port #7ffd causes the shadow screen to be displayed.
    MatGubbins MatGubbins September 2015 Hardware
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    ... "]I get the same blank screen on my +2 (grey). When ... IN from port #7ffd causes the shadow screen to be displayed.
    mityay mityay October 2015 Hardware
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    ... "]I get the same blank screen on my +2 (grey). When ... IN from port #7ffd causes the shadow screen to be displayed.
    Alessandro Grussu Alessandro Grussu October 2015 Hardware
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... that everything that involves changing screen pages (Mescaline does this on ... during the first effect (snow screen, then eyes scrolling up, ... made to demonstrate the split screen capabilities of the 128K ... toggle bit 3 of port $7FFD, but the next frame following ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... these events (writes to the screen buffer and writes to port ... to bit 3 of port $7FFD), which are only attended on ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • 128k Paging a tile routine to a double bufferHi happy new year all :) Does anyone have an example of how to page a routine to the screen ie a tile routine? Thanks :)

    ... value to #7FFD used for paging in the inactive screen
    ... FLIP_SCR ;switches the 'currently active screen' bit
    ld a,(PAGE ... ;pages in the currently inactive screen
    call GET_SCR
    .screen=$+1
    or #10
    ld bc,#7FFD
    ...
    Hikaru Hikaru January 2016 Development
  • Please test your ZX128+2 (grey model)Please reset your ZX128+2 (grey) and write in 128 basic (or in USR0 mode): [B]PRINT IN 32765[/B] - if basic crash (black screen) then your ZX contai…

    ... in) and the black screen (because the shadow screen gets selected). The ... does explicitly state that port 7FFD must never be read :)
    Peter Mulholland Peter Mulholland May 2016 Hardware
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... a problem for the normal screen since they are likely initialized ... the case with the shadow screen at bank 7, the ... all zeros. Hence the black screen I suppose... Also look around ... />
    Display shadow screen, page in normal screen at #C000:
    the ...
    Hikaru Hikaru August 2016 Development
  • Basic Screen Shadow QuestionHello, I've been porting a game to the Spectrum from another platform. So far so good and I have per pixel screen scrolling working really nicely …

    ... a problem for the normal screen since they are likely initialized ... the case with the shadow screen at bank 7, the attributes ... all zeros. Hence the black screen I suppose... [/quote]

    7FFD for itself, making #5B5C updates ...
    pointblnk pointblnk August 2016 Development
  • New Game - Pietro Bros [z88dk/Nirvana+][b]PIETRO BROS[/b] Pietro and Luizo were transported to pipe world after eating some rancid mushrooms on his pizza. Help them to escape from th…

    ... />
    pietro_loader:

    ; 1. SCREEN$

    ld ix,16384 ... spectrum

    ld bc,$7ffd
    ld de,$1016

    ld bc,$7ffd
    ld de,$1016
    Alcoholics Anonymous Alcoholics Anonymous December 2016 Brand new software
  • Correction of +2 hardware errorsThis is a collection of various pieces of information picked up from various places, including a lot from this forum. I have edited it and reworded i…

    ... as "screen raining / snow effect"
    - data of paging port 7FFD are ... if CPU read of port 7FFD (write floating bus data)
    7FFD is also good, but make ...
    Renegade Renegade April 2017 Hardware
  • endless runner project..So I'm thinking of writing a small tutorial series on writing games for the speccy in C, and figured that an endless runner would be an easy example …

    ... border colors. Port #7FFD switches 128K pages. The screen is at #4000 ...
    Hikaru Hikaru May 2017 Development
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... floating bus (assumes that screen is filled with 0s)
    screen bitmap/attributes must not be ... FF (I usually clear the screen prior to running the test ... EQU $-1 ; currently projected screen
    ld bc, #7FFD
    out (c ...
    introspec introspec June 2017 Development
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