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<1234567…34>
  • Currah MicroSource emulationIt appears to be impossible to emualte the MicroSource in software on the ZX Spectrum SE as hardware polling is required. The following patch is not …

    ...
    ; install MicroSource ROM in EX bank


    ; patch BASIC ROM to prevent overwrites

    ld hl,$33fb ; prevent RST 0H being overwritten
    ld ... simulate cold reset

    rst 0h ;

    ; MicroSource ROM patch ( ...
    chev chev March 2007 Emulators
  • DIVIDE - source code of new FATWARE 0.14[B][U][SIZE="5"]Source code of FATware system is now free.[/SIZE][/U][/B] BAZE (author of FATWARE) release source code of last version FATWARE 0.14 …

    ... Exist also device with possibility rom emulation in ram - it's ... (replace zx rom with ram3+ram2 pages)
    RST 0 ;reset and connect ... then will possible uninstall custom rom and return to original ... ;deactive conmem + active mapram
    RST 0 ;software reset
    velesoft velesoft May 2011 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... ).

    - as reset circuit use TL7705 or similar ... as output signal /RESET on system bus (reset will only output, ... external device can't active reset, ... - add jumper for disable rewriting rom (disconnect /WR from flash eprom ...
    velesoft velesoft December 2012 Hardware
  • The new Superfo cloneHi In the spanish forum speccy.org some guys and me have optimized the superfo clon to have less ICs. The actual design has 39 ICs versus the 45 ICs…

    ... use as output signal /RESET on system bus (reset will only output, external ... ]

    The ZX Spectrum ROM resets to "00" all the ... /> - add jumper for disable rewriting rom (disconnect /WR from flash eprom ...
    antoniovillena antoniovillena December 2012 Hardware
  • Faulty 48K Issue 3 motherboardHi I have a faulty Issue 3 motherboard and would appreciate it if somebody can steer me in the right direction of where to begin with the fault find…

    ... chips, the ULA, CPU and ROM.
    Pierre[/QUOTE]
    - Check RESET pin in z-80(must ... /> - Check address bus and data bus from z-80. you ... />
    - Check address bus from 4116 chips and ULA ... - Check address and data bus between ROM and z-80.
    ...
    Jose_Leandro Jose_Leandro April 2013 Hardware
  • ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…

    ... for other chips (including the ROM and RAM) in the system ... address, control or data bus failure, ROM failure or RAM failure will ... is not being held in reset, as you indicate that there ...
    1024MAK 1024MAK October 2017 Hardware
  • Amazonia (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027280"]Amazonia[/URL], please add the following "known errors" des…

    ... 9ec4 22c89b ld (9bc8h),hl ; reset time counter
    9ec7 21e99b ... another key
    a4bc c7 rst 00h ; reset computer[/CODE]

    a4bc c7 rst 00h ; reset computer[/CODE]

    Einar Saukas Einar Saukas January 2012 Infoseek database
  • Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …

    ... 've booted with a diagnostic ROM and the memory is all ... is the NMI and floating bus. The ROM checksum is also good ...
    rune rune November 2014 Hardware
  • emuzwinyeah i ran my game and i can't get back to the programming screen bit! when i used to have a speccy i'd just bang the keyboard a few times and it'd …

    ... again. Fixed.

    [*] When Reset, ROM image does not restored now ... |Spectrum128 / New|Spectrum48 / New|Custom ROM selected from the menu, the ... ROM is reloaded to selected one.< ...
    Vladimir Kladov Vladimir Kladov March 2004 Emulators
  • MAME on the Spectrum?Yes, I know it's currently AY's job to make ludicrous posts (a position he's filling in very well, until TKRAP returns), but just out of interest, if…

    ... replaced by a RST.
    In the 'ROM' the RST will read the ...
    Dr BEEP Dr BEEP May 2006 Emulators
  • Handling RST8 on a +3Well, I've come to that bit of my project that I wasn't really looking forward to (because I don't understand enough about the ZX BASIC ROM) - extend…

    ... only do so via the ROM socket library, or the ... need to do an RST 8 trap at any ... time (because RST 8 traps bring along other ... one device can own RST 8 ). The ROM can be entered ... library without requiring any ROM trapping, the RST 8 trap infrastructure ...
    Winston Winston July 2008 Development
  • Cro S2008Hi everybody!!! I hope this is right thread? :-) I want to share with you my new project. I call it ?S2008?? The idea was to build Spectrum48K clo…

    ... ) disable /ROMCS = disable internal ZX rom chip. But all external devices ... log.1(disable internal ZX rom) + connect external memory. If ... S2008 will collide od data bus with rom/ram from external interface ... to log.1(on ZX bus), if internal ZXCF memory is ...
    velesoft velesoft January 2009 Hardware
  • Amazonia (BUGFIX)This is a bugfix for game [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027280"]Amazonia[/URL], please add the following "known errors" des…

    ... 9ec4 22c89b ld (9bc8h),hl ; reset time counter
    9ec7 21e99b ... another key
    a4bc c7 rst 00h ; reset computer[/CODE]

    a4bc c7 rst 00h ; reset computer[/CODE]

    Einar Saukas Einar Saukas January 2012 Infoseek database
  • OpenSE BASIC disassembly?The [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]OpenSE BASIC[/URL] page provides a source code listing, however it doesn't really…

    ...
    ;
    l0007: ;
    rst start ; reset to start

    _error_1 ...
    Dunny Dunny September 2012 Development
  • Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…

    ... pin ; "Clock input
    rst pin ; "Asynchronous reset
    cnten pin ; "Count ... clock input
    count.ar = rst; "Counter reset input

    " ... clk, // Clock.
    input rst, // Async. reset
    input cnten, // Count ...
    mcleod_ideafix mcleod_ideafix January 2013 Hardware
  • NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…

    ... nothing will drive the bus. So the value on ... the data bus is typically either the ... last value sent on the bus (due to stray capacitance ... resistors between the data bus for [the lower RAM ... the CPU side data bus [CPU, ROM, upper RAM, expansion port ...
    1024MAK 1024MAK December 2015 Games
  • The state of source level debuggingI was just wondering if we can put on a table everything we collectively know about source level debugging for ZX Spectrum to get an overview of curr…

    ... ...to somehow rewire one RST jump in ROM to our debugger, recognize ... by ZX ROM at some point (executing a RST call to ... would then show assembly (showing ROM assembly).

    ... the breakpoint. The breakpoint (RST command) would cause passing control ...
    tstih tstih November 2016 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... the first byte of the ROM (DI, 0xf3) would cause ... there is a RST n on the data bus, it takes ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ... was zero (thus causing a reset). However various peripherals, most ...
    Philip Kendall Philip Kendall July 2004 Development
  • It's a trap!So I got a CPLD (not the eventual one I want to use for the ethernet project - rather, one I actually have here and now, an XC9536 in a PLCC44). And…

    ... />
    - 0x0000 - only when RESET has been asserted. (All executions ... of 0x0000 without a reset result in no trap).< ... CALL instruction on the data bus (i.e. decode CALL ... Complete Spectrum ROM disassembly" especially with regards to RST 8 traps.< ...
    Winston Winston December 2007 Hardware
  • Shadow ROM partial decoding not implemented in emulatorsOr at least, not implemented in Spectaculator, and it seems that not in Fuse too. [URL="http://www.speccy.org/foro/viewtopic.php?f=8&t=408&start=53"…

    ... are from the main ROM, not floating bus (ULA/FFh), of a ... hardware automatically unpages the shadow ROM. As the RET instruction ends ...
    ld (5cedh),hl
    rst 8
    db 32h ;CALL ...
    mcleod_ideafix mcleod_ideafix June 2011 Emulators
  • 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…

    ... 48rom:
    #0000 - power-on/reset/rst0/software restart
    #0008 ... error
    #0038 - im1 interrupt/rst #38
    #0066 - nmi routine ... often connect only 48rom(rom 1) after each reset/power-on and ... on mapping points in external rom memory. Also exist next ...
    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
  • Currah uSpeech ROM Paging and BootyHi, When I emulated the Currah uSpeech for [url="http://www.inkland.org.uk/inkspector"]InkSpector2[/url], I made it page in its own ROM on memory …

    ...
    ld a,$11
    rst $10

    And this ... The intention is for the RST instruction to call address ... instruction above) the uSpeech ROM is executed. The Z80 ... in the ZX Spectrum ROM which looks like this:< ... po (P/V flag reset) is true on the ...
    inky inky October 2019 Hardware
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... the first byte of the ROM (DI, 0xf3) would cause ... there is a RST n on the data bus, it takes ... was intended that the ROM would jump to the value ... test was reversed in the ROM, so it would jump ... was zero (thus causing a reset). However various peripherals, most ...
    Fraser Fraser July 2004 Development
  • ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…

    ... (a timer that is automatically reset in a loop, so that ... 0x66 is located in the ROM.

    Maskable interrupts, unlike ... typically be a single-byte "RST n" instruction that effectively causes ... resistors on its entire data bus so that although nothing is ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
  • Spectrum Ethernet update...in which a toastrack 128K machine prods a machine outside of my LAN for the first time. [url]http://spectrum.alioth.net/doc/index.php/Current_eve…

    ... an RST 8 trap and subsequent return to the main ROM, such ... in compatibility with other paged rom devices, specifically mass storage.
    RESET, the network adapter traps the ... by then the Spectrum's bus would be overloaded anyway).
    Winston Winston March 2008 Hardware
  • Is the original divIDE compatible with Interface 1Is the original divIDE hardware compatible with Interface 1 ? I would like to use the divIDE and Microdrives connected at the same time. Is this pos…

    ... the clash of the data bus occur ?

    Using FATWARE ... of ZX Interface 1 ? After RST 8 connect IF1 external eprom ... external rom memory if CPU go to adress:
    #0000 = reset/rst 0 ...
    #0008 = RST 8
    #0038 = ...
    velesoft velesoft January 2009 Hardware
  • Interface One - New FunctionalityAs you may (or may not) be aware the Interface One is a pretty powerful piece of kit. One of it's greatest features is being able to easily extended …

    ... to stop the main ROM from being selected. Peripherals ... how the Spectranet handles reset and still allows a ... DivIDE to handle its reset initialization). What could have ... ad as much as the bus can take). It's ... instructions instead of trapping RST 08. This way it ...
    Winston Winston July 2009 Development
  • divIDE & Joystick interface / other peripheralsHi, Anyone on here with a divIDE, managed to get the divIDE to play nice with a Kempston joystick interface; specifically - a RAM Turbo joystick int…

    ... NMI line on the ZX bus, so if the DivIDE NMI ... does nothing. For reset, the Spectranet grabs the reset signal first to ... ROM). The Spectranet CPLD keeps some state information for NMI and reset ... addreses or not.

    RST 8 traps are a thornier ...
    Winston Winston August 2009 Hardware
  • SPIN Public Beta 0.1b Available for downloadHi all, back again, and as just recently announced on CSS, SPIN has been updated. Here's the post to CSS (or the relevant parts): It's been a bu…

    ... +3 code

    Changed Reset Icon to a power icon ... ULA Snow effect, and Floating bus based on RamSoft's technical ... - it loads and runs the ROM, but not much else.
    Dunny Dunny May 2002 Emulators
<1234567…34>

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