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Search Again :: Adv Search 62 results in 0.000s
<123>
  • Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…

    ... the byte 16384 is displayed" (14336 tstates pass)

    "define ...
    Unique Unique February 2005 Development
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    ... in a delay loop until 14336 (adjust according to machine) tstates ...
    Philip Kendall Philip Kendall September 2004 Development
  • Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…

    ... pulled low by the ULA 14336 (on the 48K machine) tstates ... the interrupt, then waits 14112 ( = 14336 - 224 ) + n tstates, then changes ...
    Philip Kendall Philip Kendall September 2004 Development
  • Does ScanLine[0] have a left border?My emulator couldn't handle Cobra or ShortCircuit so I added some rough port FF values. I now want to make it a bit more accurate. The FAQ gives me a…

    ... see, so for the first 14336 tstates the border is sent ...
    Unique Unique February 2005 Development
  • Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?

    ... 8479. Does the program give 14336 on a 48k?
    Fred Fred March 2005 Development
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    ... about Ula timings..
    after 14336 T-states from the interrupt ...
    Mp Mp November 2005 Hardware
  • Z80 cycle contentionHi, Does anybody knows exactly when the ula halts the Z80 clock during a memory r/w cycle? I mean which Z80 clock cycle, T1 or T2? Thanks..

    ... about Ula timings..
    after 14336 T-states from the interrupt ...
    icabod icabod November 2005 Hardware
  • I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…

    ... or iorq+mreq=00
    14336 5 ( " " ) no delay if A14 ...
    Mp Mp February 2007 Development
  • Border emulationHow is the border emulated to do all the fancy little tricks such as in Aquaplane? I've got some basic border emulation working but it only displays…

    ... the screen proper is displayed 14336 tstates after interrupt and that ...
    Philip Kendall Philip Kendall May 2007 Emulators
  • How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…

    ... screen starts being drawn at 14336 tstates and ends at 57472 ...
    Philip Kendall Philip Kendall May 2007 Development
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... under contention at T-state 14336, which is when everything starts ... fetched[/I]

    [CODE]14336 IO Contention Starts
    14337 ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... under contention at T-state 14336, which is when everything starts ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... find that contention starts at 14336 (This is IO contention!). Now ... -state early, then you get 14336 as this "pixel output" value ... /> The assumption has been that 14336 - 14335 = 1 contented T-state ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... asserting that tstates 14335 and 14336 after interrupt do not experience ...
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... asserting that tstates 14335 and 14336 after interrupt do not experience ... ]executing[/B] during 14335 and 14336, then it will experience contention ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... ]executing[/B] during 14335 and 14336, then it will experience contention ... after interrupt, including 14335 and 14336. No IO involved. On Fuse ...
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... after interrupt, including 14335 and 14336. No IO involved. On Fuse ...
    00,00,00,ff - 14336
    00,00,00,ff ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... , FAQ says it starts at 14336 (both measured relatively to ULA ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... an opcode fetch at 14336 is:

    14336 Contend 6 tstates ... 's model does:

    14336 T1
    14337 T2
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... an opcode fetch at 14336 is:

    14336 Contend 6 tstates ... the "[I]contention starts at 14336 and continues for 6 cycles ... 's model does:

    14336 T1
    14337 T2
    14336 and continues for 6 cycles ...
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... the "[I]contention starts at 14336 and continues for 6 cycles ...
    Philip Kendall Philip Kendall September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... of contention, which starts at 14336 and lasts 6 cycles.
    Patrik Rak Patrik Rak September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... of contention, which starts at 14336.
    [/quote]

    Yes ...
    Woody Woody September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... of contention, which starts at 14336 and lasts 6 cycles.
    csmith csmith September 2007 Emulators
  • Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…

    ... starts at 14362 instead of 14336, the line is 228 instead ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • Difference in emulator screen sizes and coloursSeeing as Greencard's gone out drinking... I've done a comparison between Spectaculator and ZXSpin. ZXSpin's full screen with border is taller than S…

    ... interrupt occurs, 64 line times (14336 T states; see below for ...
    rich_chandler rich_chandler December 2008 Emulators
  • Contention: LDI vs LD (ss), rAccording c.s.s. FAQ: instruction LD (ss),r breakdowns as pc:4,[b]ss:3[/b] and LDI as pc:4,pc+1:4,hl:3,[b]de:3,de:1 x 2[/b] can anyone explain why …

    ... copy to screen between T=14336 (end of upper border) and ...
    Fikee Fikee February 2011 Development
<123>

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