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  • Dumping Microdrives (to a PC, not to a skip)Morning/Afternoon/Evening chaps, What do people use for getting their data off a microdrive quickly? I know of at least one project which does it ra…

    ... people use for getting their data off a microdrive quickly?
    Data 1 and Data 2 (Pins 1A and ... />
    Export the analyser data using 8-bit data, and only exporting changed ...
    Spirantho Spirantho October 2014 Sinclair Miscellaneous
  • I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…

    ... Accumulator, I think, pointing to bit 6 (does this mean A=64 ... />
    So I'm a bit confused why the code places ...
    Tobo Tobo March 2016 Development
  • Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…

    ... . I understand how they connect. (Data and address busses, chip select ... the CPU directly through the data bus. What pecies of hardware do ...
    KipperKlank KipperKlank March 2017 Hardware
  • New Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike DaillyNew Windows Spectrum Emulator: CSpect V0.2 ZXSpectrum emulator by Mike Dailly (Found on SpecNext Facebook-Page) Info and Download (=klick "CSpe…

    ...
    ===================
    port $123b
    bit 0 = WRITE paging on. $0000 ... to selected VRAM page
    bit 1 = Layer 2 ON (visible ... 2 behind Spectrum screen
    bit 6/7= VRAM Banking selection (layer ...
    Luzie Luzie July 2017 Emulators
  • Power Play Joystick InterfacePower Play Joystick Interface for the ZX Spectrum. This is a Kempston compatible interface. Address decoding Any IO address where A5 is low... …

    ... .
    [code]Pin 1 - bit 3 - Up
    Pin 2 ... Pin 3 - bit 1 - Left
    Pin 4 - bit 0 - Right
    Pin 6 - bit 4 - Fire
    Pin 7 ... br /> ----- - bit 5 - always 0
    ----- - bit 6 - always 0
    ----- - bit 7 - always ...
    1024MAK 1024MAK July 2017 Hardware
  • Working away from homeAnybody done it? any pointers? Ive seen a CNC job in Shildon, County Durham which i think i'd have a decent chance at getting, however i dont driv…

    ... looks impossibubble, my first bus is at 6.30 in the morning ...
    mel the bell mel the bell January 2018 Chit chat
  • Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…

    ... is long and seems a bit cumbersome.

    Here ... /> ld a, (de)
    bit 0, a
    jr z ... b1: ld a, (de)
    bit 1, a
    jr z ... b2: ld a, (de)
    bit 2, a
    jr z ... b6: ld a, (de)
    bit 6, a
    jr z, b7 ...
    FrankT FrankT December 2020 Assembler
  • zx spectrum 48k issue 6A boot fail- black paperohh whats wrong with this poor specie .. boot fail,, border white & paper black .. when reset it shows the red lines to indicate that the CPU is cycl…

    ... thinking is that it is data bus problem not addressing so unlightly ...
    mark8bit mark8bit February 2021 Hardware
  • Original rubber key 48k'sThis question is to some point academic; But i seem to remeber the original 48k Rubber Keys Speccy came in versions 1,2 & 3! (way back when, occasi…

    ... in a value from the EAR socket and until now this ... . The result is that the EAR bit now floats until the ULA ... , and not just the keyboard bit, can no longer be used ...
    Mike Jeanes Mike Jeanes July 2001 Sinclair Miscellaneous
  • adding colourThis my sound like a real stupid Q but when programing a picture how do i add colour like filling in shapes with colour. What kind of programming sh…

    ... 5 are PAPER
    and bit 6/7 FLASH and BRIGHT (or ...
    Dr BEEP Dr BEEP July 2002 Sinclair Miscellaneous
  • What is a Kempston joystick?Just a quick question from an ignorant Commodore user (what, a Commodore user on this sacred ground? Relax, I'm a fan of all 8-bits, including the wo…

    ... other port with either of bit 3 or 4 reset - it ... to anything with bit 5 reset (and maybe bit 6 and 7 as ...
    Philip Kendall Philip Kendall September 2002 Sinclair Miscellaneous
  • a poke to change fonts??hi ppl, there wasnt some poke in basic to change the look alike of the fonts of speccy?? I guess I did things like that in eighties.. also, there…

    ...
    2/3 : shift 1 bit right
    4/5 : do ... nothing
    6/7 : shift 1 bit left
    8 : do ... />
    Bold:
    Test if Bit 1 is set, if so ... is set, if so set bit 6
    and so for the ...
    Dr BEEP Dr BEEP September 2002 Sinclair Miscellaneous
  • TAP files for the TS 2068Hi, just recently bought a TS 2068 and found "Taper" on the web. Downloaded it and began to use it only to discover that it would not open TS 2068 fi…

    ... ports and it's data bus gave random data when unused addresses were ... pure BASIC code and SCREEN$ data should work without problems.
    Sparky Sparky December 2002 Sinclair Miscellaneous
  • helpHi, I am new to this forum. I have purchased a Speccy from ebay but I am having trouble getting any games to load. I dont really have much technical…

    ... are the voltages on the data bus which will always exist if ...
    cyborg cyborg April 2003 Sinclair Miscellaneous
  • bug in spectaculator? Hi Jon, While testing the AMX mouse emulation in Spectaculator I noticed that the mouse buttons don't work. My program reads port $df to detect mo…

    ... the left mouse button and bit 6 to correspond to the right ...
    Alcoholics Anonymous Alcoholics Anonymous August 2003 Emulators
  • 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…

    ... interrupt? It watches the Z80 data bus to see if a 'reti ...
    Alcoholics Anonymous Alcoholics Anonymous September 2003 Development
  • Loading programs directly via SoundblasterLet's just hope this does not sound too silly (I'm a newcomer)... Is is possible to connect a real Spectrum's MIC port to the audio out port of a Sou…

    ... " IIRC, which carried over to bit 6 of port #fe - but don ... ROM itself only loads from bit 6, not bit 5 and so your ...
    Dunny Dunny October 2003 Emulators
  • help in byte mirroring.I need some help. What is the best way to mirror the byte? (for ex. 10010011 -> 11001001) I mean, if there is a simple way to do it (may be with OR, …

    ... bit0 }

    IF Bit 6 != bit 1 {
    bit 6=bit6 XOR bit1
    bit 1=bit6 XOR bit1
    bit 6=bit6 ... XOR bit1 }

    IF Bit 5 != bit 2 {
    bit 5 ...
    Fraser Fraser October 2003 Development
  • Z80 coders compoIf you're interested in Z80 coders compo, visit my page [url="http://mbr.nm.ru/compo.html"]http://mbr.nm.ru/compo.html[/url]

    ... /> ; bit 4 contributes '6' (16)
    ; bit 5 contributes '2' (32)
    ; bit 6 contributes ... '4' (64)
    ; bit 7 contributes '8 ... ' (32)
    ; bit 6 contributes '6 = 4 + 2' (64)
    ; bit 7 contributes '12 ...
    Alcoholics Anonymous Alcoholics Anonymous November 2003 Development
  • basil the great mouse detectivehello i have a small problem with this game.when i have completed level 1,spectaculator 6.0 tries to find level 2.it find it,but it does not load it…

    ... output by flipping the respective bit rather than setting it to ... ]

    Given that the EAR bit on port $FE can be ... TZX block should have the EAR bit set to low when commencing ...
    Dunny Dunny March 2004 MIA/STP/SDP
  • basil the great mouse detectivehello i have a small problem with this game.when i have completed level 1,spectaculator 6.0 tries to find level 2.it find it,but it does not load it…

    ... this is implemented as ear=1 and ear=0 respectively or the ... an option whether 'low' on EAR is 0 or 1 :o ... /> [quote]
    Given that the EAR bit on port $FE can be ...
    Mikie Mikie March 2004 MIA/STP/SDP
  • basil the great mouse detectivehello i have a small problem with this game.when i have completed level 1,spectaculator 6.0 tries to find level 2.it find it,but it does not load it…

    ... cyan and red (ie. the ear bit is toggling anyway).

    Jon Needle Jon Needle March 2004 MIA/STP/SDP
  • basil the great mouse detectivehello i have a small problem with this game.when i have completed level 1,spectaculator 6.0 tries to find level 2.it find it,but it does not load it…

    ... at the patent for the ear circuit (which Geoff pointed me ... the initial state of the EAR bit to get it to load ...
    Jon Needle Jon Needle March 2004 MIA/STP/SDP
  • No speech in Cobra's Arc? A mystery tale from Spain...I once downloaded CsA - probably from some Spanish retrogaming website - in TAP format. While I usually discard TAP files in favor of TZX ones as soo…

    ... the sound instead of the EAR bit (4? I might have them ... . Most emulators only emulate the EAR bit, but R80 (excellent emulator BTW ...
    Metalbrain Metalbrain April 2004 Games
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    More than 19 cycles surely? It's 19 cycles to acknowledge IM2 and jump to 0x100*I + , then 4 for the EI and 8 for the RETI = at least 31 cycles (which then just about leaves the possibility of a retrigged interrupt?)

    Still significantly less ...
    Philip Kendall Philip Kendall May 2004 Development
  • VSYNC FunctionI have written a VSYNC function, so that I can clear the screen before redraw without flicker on the screen, I do this by peeking at the address 2367…

    [quote]
    On 2004-05-07 09:44, Philip Kendall wrote:
    More than 19 cycles surely? It's 19 cycles to acknowledge IM2 and jump to 0x100*I + , then 4 for the EI and 8 for the RETI = at least 31 cycles (which then just about leaves the possibility of ...
    Alcoholics Anonymous Alcoholics Anonymous May 2004 Development
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