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<1234567…34>
  • A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…

    ... pulses for a '1' bit or '0' bit within the byte that ... that supposely shifts each bit in a byte so ... just before entering the "transfer bit" loop, the carry is ... carry to the bit 0 of L, and the bit 7 of ... a '1' is loaded into bit 0 of L.
    So, regardless ...
    mcleod_ideafix mcleod_ideafix January 2011 Development
  • SpecBAS 0.711 Now AvailableA few bugs fixed, a few new functions to make writing stuff easier... Go grab it here: [url]https://sites.google.com/site/pauldunn/SpecOS.zip[/url] …

    ... raftload of new functions - mostly bit-twiddling (HIBYTE, LOBYTE, HIWORD, ... origin at 0,0.
    BIT(n,m) returns the bit value (1/0) of ... value n at bit ... m - bit 0 being the ...
    Dunny Dunny November 2011 Sinclair Miscellaneous
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…

    ... A ; A = nr of bit (0-7)
    ........INC E ... /> ........SCF ; for bit 0 SCF
    bit....ADC A,A ; ... ........DEC E
    ........JR NZ,bit
    ........LD E,A ... A,E ; E = set bit
    ........OR (HL)
    bit
    ........INC B ; next ...
    Dr BEEP Dr BEEP October 2001 Sinclair Miscellaneous
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…

    ... x,y) coordinate.
    ; The (0,0) origin is placed at the ... z, or_pixel ; pixel is at bit 0...
    plot_position: rlca
    ... pixel byte
    ; a = bit number of byte where pixel ... /> ; fz = 1 if bit number is 0 of pixel position
    rtunes rtunes October 2001 Sinclair Miscellaneous
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…

    ... c,A ; A = nr of bit (0-7)
    XOR %00000111 ... br /> jr z,part_meio ;if bit 7 then we can print ... ;ld a,e
    or 0
    jr z,fim_horz
    bit 0...
    bit4: rlca
    ...
    rtunes rtunes November 2001 Sinclair Miscellaneous
  • line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…

    ... b,A ; A = nr of bit (0-7)
    INC b ; now ... /> XOR A
    SCF ; for bit 0 SCF
    bit1:
    ADC ... /> LD (HL),A ; plot the bit
    INC H ; next screenline ... z, or_pixel3 ; pixel is at bit 0...
    bit5: rlca
    ...
    rtunes rtunes November 2001 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... /> LD B,NO_OF_BYTES
    LOOP : BIT 0,(HL) ; test on 1
    SET 7,(HL) ; set bit of HL +1
    NEXT ...
    Dr BEEP Dr BEEP July 2002 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... i've tested it a bit and it seems to work ... if 0 is the first bit in a byte (i.e. bit ... t care what the masking bit at the position of ... : rr c ;put the masking bit (0) to c
    ......rlca ; ... get the next masking bit
    ......jp nc,buildmask ;loop ...
    Mikie Mikie July 2002 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... ; Note number of first reset bit.


    ; ... ; Retrieve first byte with reset bit location
    POP DE ; ... reset).
    INC B ; Let bit 0 work.
    SCF
    ... ; bit 0 of previous byte in bit 7. Carry
    ; is loaded with bit 0 ...
    Fraser Fraser July 2002 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... 0 is the first bit in a byte (i.e. bit ... care what the masking bit at the position of ... rr c ;put the masking bit (0) to c
    .....rlca ... ;get the next masking bit
    .....jr nc,buildmask ... .....pop af ;restore the bit 0 of the previous byte (in ...
    Mikie Mikie July 2002 Sinclair Miscellaneous
  • Machine Code ChallengeHere's a challenge for all you Z80 programmers. Points to be awarded for elegance and brevity. (I haven't got the solution either) HL addresses the …

    ... ; bit 0 of previous byte in bit 7. Carry
    ; is loaded with bit 0 ... 4 INC B ; Let bit 0 work.
    8031 1E00 ...
    Fraser Fraser July 2002 Sinclair Miscellaneous
  • undocumented Z80I am documenting a feature nobody has done before and no emulator gets right at this time. I'll have a report after doing some more tests. Fraser.

    ... of the last 16 bit arithmetic operation:
    BIT 0,(HL)
    PUSH ... AF
    POP DE
    BIT 3 ...
    Fraser Fraser September 2002 Emulators
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... contains video information.
    If bit 0 is reset 16 colour frame ... is sent determines mode).
    Bit 0 contains the video size, reset ... difference that bit 7 is 0, bit 6 is OR'd with bit 0 then ... XOR'd with bit ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • printer port redirect to (Windows) system printerIs there any emulator (+2A/+3 compatible) that can be configured to output the, say, parallel printer port to the Windows system port ? The default o…

    ... #0FFD (the output byte itself), bit 4 / port OUT #1FFD (the ... a fake BUSY signal for bit 0 / port IN #0FFD.
    For ...
    secarica secarica November 2002 Emulators
  • ZX81 and ZX80 emulator on Spectrum 128KA couple of weeks ago we were talking about a new ZX81 emulator for the 128K. Someone beat me. More details at [url="http://www.fruitcake.plus.com/S…

    ... on the number of waves. Bit-0 is represented by 3 to ... (normally 4)
    waves and Bit-1 is represented by 6 ... ] (approximately the same duration as Bit-0).

    So the 01 ... sequence of 1's or 0's with the corresponding length ...
    GOC GOC September 2003 Emulators
  • X-Out level loaderCan anyone confirm all the levels of this game (the original game tzx) will load? Does anyone want to find how the checksum works?

    ... and add the Sync and Bit 0 & 1 into the loaders ...
    Andrew Barker Andrew Barker September 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, …

    ... /> IF Bit 7 != bit 0 {
    bit 7=bit7 XOR bit0
    bit 0=bit7 XOR ... bit0
    bit ... br />
    IF Bit 6 != bit 1 {
    bit 6=bit6 XOR bit1 ... br />
    IF Bit 5 != bit 2 {
    bit 5=bit5 XOR bit2 ...
    Fraser Fraser October 2003 Development
  • 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, …

    ... Set1
    0005 CB47 8 BIT 0,A
    0007 CA1400 ... br /> 000D CB47 8 Set1 BIT 0,A
    000F C21400 ...
    0014 CB77 8 Next1 BIT 6,A
    0016 C22100 ... 0,1 , 53 for 1,0 and 36 for both the same bit ...
    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 0 contributes '0'
    ; bit 1 contributes '0'
    ; bit 2 contributes '0'
    ; bit 3 contributes '0 ... '
    ; bit ...
    Alcoholics Anonymous Alcoholics Anonymous November 2003 Development
  • Z80 to TZX Converter !Hey Everyone ! I have a bit of time lately and I coded a little utility that can convert the Z80 snapshot (any version, 48k and 128k supported) to T…

    ... 200 T-States for bit 0 and 400 for bit 1

    Tom-Cat Tom-Cat December 2003 Development
  • [NEW]: Spectaculator 6.0Spectaculator is a Sinclair ZX Spectrum emulator for PCs running Windows 95, 98, ME, NT 4, 2000 and XP. Spectaculator emulates the 16K/48K/128K/+2/+…

    ... not always 2 times a BIT 0 and of course the sync ... 1 and 0 values.

    Don't ...
    Andrew Barker Andrew Barker January 2004 Emulators
  • New project for 256 colours Games emulator!O.K. , I suggested Jonathan Needle ( Creator of the excellent Spectaculator at [url="http://www.Spectaculator.com"]www.Spectaculator.com[/url] ) to c…

    ... s display, ... , bit 0 comes from z80-0's display. Take this ... 8-bit value and ... to get a 24-bit RGB value for display. ... fixed meaning to the 8-bit value (like RRRGGGBB). ... . Perhaps emulating a 32-bit z80 is more practical -- ...
    Alcoholics Anonymous Alcoholics Anonymous January 2004 Emulators
  • TZX format updateHi folks. Following the private communication with Andy I would like to start a discussion on changing the TZX format to reflect new needs and improv…

    ... 2 Length of ZERO bit 1st pulse [855]
    bit 2nd pulse [855]
    bit 1st pulse [1710]
    bit 2nd pulse [1710]
    bit 0 flag byte present
    bit 1 parity ...
    Mikie Mikie February 2004 MIA/STP/SDP
  • TZX format updateHi folks. Following the private communication with Andy I would like to start a discussion on changing the TZX format to reflect new needs and improv…

    ... - the length of the bit 'words' is based on ... though:
    Bits 0 and 1 are both ... by 'phasing' the wave - bit 0 leaves the 'phase' unchanged ... while bit 1 reverses the 'phase'.
    bit flag bytes - otherwise ...
    Mikie Mikie February 2004 MIA/STP/SDP
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... AA I had the following bit of code written when ... )
    RET ;return with BIT 0 set

    TESTY ...
    CDFLAG DEFB 0 ;Collision Detection Flag
    ;BIT 0 set if there ... is a intersection
    ;on X-Axis, BIT ...
    dmsmith dmsmith August 2004 Development
  • Anyone know the address mappings...of the hardware resources on the speccy; From the screen display address range to all the hardware control registers. etc. Where can I get access t…

    ... for whether sprite is on : Bit 1 set if ON

    BIT 0,(HL) ;Check if sprite is ...
    dmsmith dmsmith September 2004 Development
  • Collision DetectionHi everyone, This is my first post on WOS. Like most people here I owned a Spectrum when a teenager. At that time I was quite heavily into programmin…

    ... the tips. I rewrote this bit again a few weeks ago ... for whether sprite is on : Bit 1 set if ON

    BIT 0,(HL) ;Check if sprite is ...
    dmsmith dmsmith September 2004 Development
  • Read the joystickAnyone written a nice joystick reading snippet?

    IF 2 Port 1 and 2 are just the IN's from row 1-0

    Cursor also, but with bit 4 tested on first in and second in for key 5 and key 6
    Bit 3 for 7 on second in
    Bit 2 for 8
    Bit 0 for 0

    See the manual for the right IN.
    Dr BEEP Dr BEEP November 2004 Development
  • IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…

    ... byte of the address is 0 then bit 6 is set based ... on the current tape pulse level (0 ... not do this only if bit 0 is 0?
    You are treating ... all port reads with bit 0 as zero as if they ... the current Ear value to bit 6. There's no extra ...
    Woody Woody March 2005 Emulators
  • IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…

    ... not do this only if bit 0 is 0?
    You are treating ... all port reads with bit 0 as zero as if they ... Break.

    So result bit 6 is set/reset based ...
    Unique Unique March 2005 Emulators
<1234567…34>

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