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<1234567…34>
  • Questions about Vortex Tracker II exported songsHi, I have been experimenting with Vortex Tracker II lately and have a couple of questions. By exporting the song to TAP format, a file is generated…

    ... af,bc,de,hl
    RST #38 ; ROM KBD SCAN if you need ...
    Jerri Jerri March 2014 Development
  • DIVIDE versus ZX128 ROMDivide interface use hardware mapping of extra memory on this fixed points in 48rom: #0000 - power-on/reset/rst0/software restart #0008 - syntax erro…

    ... error
    #0038 - im1 interrupt/rst #38
    #0066 - nmi routine
    rom 1) after each reset/power ... on mapping points in external rom memory. Also exist next big ... in ROM0, then this ZX128 rom can be compatible with Divide ...
    velesoft velesoft February 2013 Development
  • Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…

    ... /> - shadow OS / by rewiring RST 0x00 /,
    - ROM extensions,
    - IM1 routines ... check the ROM code at location 0x0028 (=target of RST 0x28 call ... therefore hook into RST 28.

    QUESTION: disclaimer ... ROM overwrites address ...
    tstih tstih July 2014 Development
  • Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…

    ... one in the 128 Editor ROM, it's horribly complicated and ... could be happening. I also disable interrupts in the handler itself ... at the end of the RST 38 routine).

    The routine ...
    Digital Prawn Digital Prawn March 2008 Sinclair Miscellaneous
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... processor simply executes an RST 38 instruction if an interrupt is ... the first byte of the ROM (DI, 0xf3) would cause ... secondly a bug in the ROM's NMI routine. It ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ...
    Philip Kendall Philip Kendall July 2004 Development
  • Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…

    ... as I know, is the ROM procedure that does the keyboard ...
    S.9 S.9 November 2006 Development
  • joining lines of BASICDue to overwhelming demand - well, one demand - well, more of a suggestion, really - here's a routine to join together lines of BASIC. The vertical c…

    ... 65136 to enable, 65146 to disable.

    Only for use ... /> VECTOR: DEFW K48+2
    RST $38 ;MASK_INT
    DI
    PUSH ... 2
    RET

    DISABLE:LD A,$3F ;65146
    Battle Bunny Battle Bunny February 2012 Sinclair Basic
  • type in to learn about IM2I'm trying to mess around with learning about IM2 and I found a nice little article in Sinclair User September 1988, issue 78, Page 70-71 [url="https…

    ... />

    clock_off:
    di ;disable maskable interupts
    ld A ... /> ret

    INT_ROUTINE:
    rst $38
    push AF
    push ...
    andydansby andydansby July 2020 Development
  • ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…

    Frankly without delving into the ROM scanning code I couldn't ... starts at &38 (it's called by RST 38).
    However you ...
    cyborg cyborg October 2001 Sinclair Miscellaneous
  • ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…

    ... at &38 because the Z80 performs an RST 38 when operating with ... .
    The routine at &38 in the BASIC is actually ... .
    Source The complete Spectrum ROM Disassembly, Doctors I Logan & ...
    john john December 2001 Sinclair Miscellaneous
  • Basic and AY musicis it possible to play an ay-music in background while a basic program is running?

    ... know ASM.

    Also RST 38 is one byte compared to ... the IM2 setup

    RST 38 ; BASIC IM1 routines
    PUSH ... some trick with using the ROM to JR but I really ...
    cyborg cyborg January 2003 Sinclair Basic
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... processor simply executes an RST 38 instruction if an interrupt is ... the first byte of the ROM (DI, 0xf3) would cause ... secondly a bug in the ROM's NMI routine. It ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ...
    Fraser Fraser July 2004 Development
  • Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …

    ... call an address in the ROM area?
    [/quote]
    ROM area is an opportunity for ...
    These days the ROM is essential for the minigame ... in the ROM.
    [/quote]

    RST are fast ... fetch from address #0038. RST#38 would be an o/ ...
    Alcoholics Anonymous Alcoholics Anonymous March 2006 Sinclair Basic
  • Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …

    ... good way to check your ROM is to remove it from ... by Z80 constantly executing #FF (RST #38 ) instruction. Your RAM will be ... 's very bad that your ROM is not in socket. I ...
    Sonic Sonic November 2006 Hardware
  • Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…

    ... a failure mode of the ROM, the CPU itself or ... a good sign that the ROM is not working. If ... from all ROM locations, which is the machine code instruction RST #38. Therefore ... it'll just execute RST #38 instructions, and ...
    Winston Winston July 2007 Hardware
  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    ... on the screen if the ROM is not present or has ... the RST 38 instruction, so lacking ROM altogether, the CPU just executes RST 38 instructions ...
    Winston Winston August 2007 Sinclair Miscellaneous
  • Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…

    ... on the screen if the ROM is not present or has ... the RST 38 instruction, so lacking ROM altogether, the CPU just executes RST 38 instructions ... .com/wholehog/stuart/spectrum-without-rom.png"]screenshot of this[/URL ... 0x0038, which itself holds an RST 38!
    zub zub August 2007 Sinclair Miscellaneous
  • 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?

    ... method of paging in the ROM. You've got two ... RAM, since only one ROM can be paged into the ... the IF1 and calls IF1 ROM code, then on return ... chip, you'll get 0xFF (RST #38 ) rather than 0x00 (NOP). ... ROM from a Speccy and power it on - it keeps executing RST #38 ...
    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?

    ... to call the Spectrum ROM, though, to call ... to the IF1 shadow ROM or the Spectrum ROM).

    RST #38 ) rather than 0x00 (NOP ... ROM from a Speccy and power it on - it keeps executing RST #38 ... $0000 in the Mirage ROM — and if there's ...
    zub zub November 2007 Hardware
  • Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…

    ... RST#38 to happen every 50th of a second, which the ZX ROM ...
    icabod icabod March 2008 Sinclair Miscellaneous
  • IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …

    ... this!
    [/LIST]

    RST 10 won't work with ... fact none of the RST routines (apart from RST 38 ) will work.
    ROM.

    I recommend Geoff ... fully commented disassembly of the ROM online. I use it a ...
    Jimmy Jimmy April 2008 Emulators
  • 128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…

    ... are booting in the 48K ROM still.
    The memory test ... ://www.mjwilson.demon.co.uk/rom/[/url][/QUOTE]

    I ... machine.

    $ff is RST $38, calling the interrupt routine over ... again...

    One swift ROM change later.. all's workin ...
    Phu Phu May 2008 Hardware
  • 128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…

    ... br />
    The 48K ROM in a Spectrum 128 is ... routine at $3c04 in ROM 1 that is called by ... in the "real" 48K ROM, but has been used in ... .

    $ff is RST $38, calling the interrupt routine over ... ...

    One swift ROM change later.. all's workin ...
    rich_chandler rich_chandler May 2008 Hardware
  • Black ScreenHi, Anyone know what would cause a 48k Spectrum to boot to a black screen? you can hear the internals buzzing at power up, but you just get a black…

    ... was working but the ROM or even the CPU ... down to zero by the ROM.

    Typically ... if the ROM is faulty you'll either ... white stripes. If the ROM is never responding to the ... stripes (the CPU will execute RST #38 over and over again - ...
    Winston Winston September 2008 Hardware
  • yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…

    ... code]
    MEMORY {
    rom (rx) : ORIGIN = 0x0000, LENGTH ... . = 0x4000;
    } > rom
    .data : {
    *(.data ... .s
    ; zx spectrum rom startup code
    ;
    ... .org 0x0000 ; rst 0x00
    di ; disable interrupts
    jp ...
    tstih tstih January 2011 Development
  • Classics ported or cloned on good ol' SpeccyHi, Spectrumists! I'm a fan of classic arcade games and I would like to know from you what do you think about ports or clones of such games on the S…

    ... br /> If you use custom rom in +3 allram mode then ... at adress #0,#8,#38,#66,#4C6,#562,#3D00-# ... br /> . If you in rom disable running CPU on this points ... .
    Divide replace ZX rom with this:
    1) ... in low 16kB instead ZX rom. Writeprotect is selectable.
    velesoft velesoft November 2011 Games
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... ;582386]...Then I removed the ROM and found the central display ... />
    If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current PC ...
    mcleod_ideafix mcleod_ideafix November 2011 Hardware
  • Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…

    ... ;582411]If you remove the ROM, and if there's not ... . $FF is the opcode for RST $38, which pushes the current PC ... some .5 second. At address $38 another &FF will be ...
    roko roko November 2011 Hardware
<1234567…34>

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  • Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
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