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Search Again :: Adv Search 1000 results in 0.013s
<1234567…34>
  • Z80 Processor Interupt helpHi everyone, Currently designing a Z80 computer and i need a little help with these interupts. If i have an I/O device that sends a pulse to the int…

    ... /> What the Z80 does upon receiving an interrupt depends on several ... byte restart instruction.
    - IM 1: the Z80 will issue ... current instruction is finished. You cannot interrupt a instruction while ... the support chips for the Z80 (Z80SIO, Z80CRTC, Z80DMA, ...
    mcleod_ideafix mcleod_ideafix January 2011 Hardware
  • ZX Spectrum Next Kickstarter Launchedhttps://www.kickstarter.com/projects/1835143999/zx-spectrum-next

    ... architecture?[/quote]
    The Z80 quickly became popular because it ... .

    The Z80 expanded the instruction set by a significant ... be run on a Z80. The Z80 was helped by being ... do this task. The improved interrupt system also helped.
    ...
    1024MAK 1024MAK April 2017 Sinclair Miscellaneous
  • Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…

    ... (run the z80 for 69888 tstates, issue a z80 interrupt and update the ... that I have converted a Z80 emulator found on the net ...
    Anders Anders September 2001 Emulators
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... moving it about 8x per Z80 interrupt, I will stick at about ...
    bverstee bverstee August 2012 Hardware
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... is non-contended, entire instruction is fetched from a memory ... S. But otherwise, when instruction is located in a contended ... in case when an instruction itself is executed from ... official Zilog documentation on Z80 processor, the instruction "out (c),r" ...
    Vladimir Kladov Vladimir Kladov May 2004 Emulators
  • SpecEmu 2.1 betaFinally I think I've cracked all the gory contention details required by those trendy multicolour demos (48K/128K modes only, +3 contention can wait …

    ... contension in case when an instruction itself is executed from non ... is an effect because the Z80 must place 7ffd on the ... official Zilog documentation on Z80 processor, the instruction "out (c),r" divided ...
    Philip Kendall Philip Kendall May 2004 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…

    ... counting it from when the Z80 interrupt occurs? This is offset exactly ... />
    I mean, the IM2 interrupt takes 19T states to reach ... 's tech notes about his Z80 emulator, which is from quite ...
    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…

    ... counting it from when the Z80 interrupt occurs?[/QUOTE]

    I ... 's tech notes about his Z80 emulator, which is from quite ...
    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…

    ... counting it from when the Z80 interrupt occurs? This is offset exactly ...
    csmith csmith September 2007 Emulators
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... it's likely an OUT instruction would do something useful.
    Z80 executes an instruction at a specific address ... page in, when the Z80 fetches the instruction from that address.
    Winston Winston November 2007 Hardware
  • Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?

    ... it's likely an OUT instruction would do something useful.[/QUOTE ... page out when the Z80 executes an instruction at a specific address ... page in, when the Z80 fetches the instruction from that address.[/QUOTE ...
    zub zub November 2007 Hardware
  • About Microdrives.I have my three microdrives sitting pretty on m new shelves above my monitor. I have never noticed it before but the tape heads look like stereo one…

    ... byte chunks) with the Z80's INIR instruction. I think that there ...
    Geoff Geoff January 2008 Sinclair Miscellaneous
  • Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…

    ... +257) to point at the interrupt routine. I am willing to ... =3089"]New documentation on the Z80 Interrupt Mode 2[/URL]?
    Arjun Arjun January 2010 Games
  • Some ROM/EPROM questions...I've got a ZX Spectrum +, a +2A and +3 computers, and I've been using +3e project ROMS for a while in my +3. I was thinking about using an EEPROM or…

    ... powering down the Z80?[/QUOTE]

    The Z80 doesn't care ... , it just executes the next instruction and ... Interface 1 - when the Z80 fetches an instruction at address 0x0008, the ...
    Winston Winston June 2010 Hardware
  • Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…

    ... completely irelevant when worrying about instruction data sizes on the x86 ... memory fetch. The entire instruction decode process is cache based ... to decode the complex x86 instruction set. Why repeat the ... of mhz on the Z80 and high instruction T-state count. OMG ...
    ASM ASM October 2010 Development
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    [QUOTE=maiki;559466]Spectrum has better games overall. Its considerably faster and better CPU [/QUOTE]
    6502@1MHz and Z80@3.5MHz are same league in performance. and i really would not compare 6502's adressing modes against Z80's wider instruction set.
    Fikee Fikee August 2011 Sinclair Miscellaneous
  • Better or Worst! Speccy vs C64Just wanted to see what games you all thought looked better or played better on the Speccy or the C64? I always thought that Renegade & Target Ren…

    ... Fikee;559724]6502@1MHz and Z80@3.5MHz are same league ... 's adressing modes against Z80's wider instruction set.[/QUOTE]

    z80 and a 4MHz z80 is peanuts... between ... less than the 68xx, 8080, z80 families. This allowed the money ...
    Alcoholics Anonymous Alcoholics Anonymous August 2011 Sinclair Miscellaneous
  • Quick OpCode Q...Leet emulat0r makerz.... I've seen two versions for this set of OpCodes, obviously they are undocumented.... FDCB d 40 BIT 0,(IY+d) (From Seans z80…

    FDCB d 40 BIT 0,(IY+d) (From Seans z80 doc)

    The instruction is to test bit 0 of (IY+d)

    Dunno what the B is supposed to be for in the other instruction.
    rich_chandler rich_chandler February 2012 Emulators
  • (Re) building a ZX Spectrum laserharpThe Cambridge show is nearing, and I want to bring my laserharp with me. Why? Because it's built around a ZX Spectrum +2: [IMG]http://benophetintern…

    ... the number DAC changes per Z80 interrupt.
    It's easy to ... code routine continues on the Z80 interrupts, and you enter BASIC ...
    bverstee bverstee August 2012 Hardware
  • Pentagon RAM memoryDoes anybody know or have reference to technical docs, how no contention on RAM access is achieved in Pentagon 128K clone ? Looking at schematics it …

    ... the memory cycle during the Z80 refresh memory access (you would ... ahead in case the Z80 processes an instruction that uses a lot ... states.
    For the shorter Z80 instructions, the video system may ... /> Using such a system, the Z80 can then run at "full ...
    1024MAK 1024MAK October 2012 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... in whenever the Z80 fetches an
    instruction from the following ... in whenever the Z80 fetches an
    instruction from the following ... ld e,e' instruction, so Lunter's Z80 tests whether PC ... execution of every single instruction (and allows for a ...
    zub zub February 2013 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... the same functions as a Z80 CPU, a ULA and memory ... has to convert each Z80 machine code instruction in the same way ... design that worked like a Z80 CPU, it was only a ...
    1024MAK 1024MAK October 2014 Hardware
  • Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …

    ... the same functions as a Z80 CPU, a ULA and memory ... has to convert each Z80 machine code instruction in the same way ...
    Yerzmyey Yerzmyey November 2014 Hardware
  • IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…

    ... manipulate memory using the Z80’s LD instruction. The IN and OUT ... these, whenever the Z80 executes [i]any[/i] instruction, it must also ... memory to fetch the that instruction so that it knows ... the short form of OUT instruction where the programmer only specifies ...
    zub zub September 2015 Hardware
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... enough, when the Z80 "captures" the instruction data from the bus ... Otherwise, it could be the instruction data from the currently paged ... 's ROM). The following instruction will however come from the ... ROM should provide the next instruction.

    [b][ ...
    1024MAK 1024MAK July 2016 Hardware
  • Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…

    ... would require an OUT (Z80 machine code) instruction (BASIC would crash as ...
    1024MAK 1024MAK July 2020 Hardware
  • Z80 RRCA instruction...Hi Folks, Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official Zilog manua…

    ... />
    Well my exploration of Z80 MCODE continues apace! I am ... to understand how the RRCA instruction works. The official Zilog manual ...
    Paddy Coleman Paddy Coleman August 2010 Sinclair Basic
  • Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…

    ... when it gets an unrecognised instruction OP Code, I mean something ... question can one fry a Z80 say by some sort of ...
    dmsmith dmsmith March 2022 Development
  • New discovery on Z80 interrupts.This is to announce the discovery of a new, hitherto unknown, behavior of the RETI and RETN instructions. As everyone knows, the maskable interrup…

    ... everyone knows, the maskable interrupt can be enabled and disabled ... kind of interrupt directly after an EI instruction, but only ... acceptance of the maskable interrupt for one instruction, but this only ... can be tested on Visual Z80 Remix: https://floooh.github ...
    rich_chandler rich_chandler April 2022 Emulators
  • Z80 AssemblerSome of you may know that I'm working on a Z80 assembler. I thought I'd start a thread so I can see what people think and what they might want to see…

    ... I'm working on a Z80 assembler. I thought I'd ... only a placeholder for a Z80 assembler tool).

    So ... create the data for the instruction LD A,n you can ... lot more freedom in creating instruction definitions than TASM's TAB ...
    cyborg cyborg February 2003 Sinclair Miscellaneous
<1234567…34>

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  • Question about CP Z80 instructionSorry if this is the wrong folder, but it seems the most appropriate. <br /> <br /> When performing a CP instruction, is the P flag set when the comp…
  • Z80 RRCA instruction...Hi Folks,<br /> <br /> Well my exploration of Z80 MCODE continues apace! I am struggling to understand how the RRCA instruction works. The official…
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