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<1…15161718192021…34>
  • Spectrum Diagnostics Board - 25th Anniversary projectWell, I said I'd try and get something online about this by today, and I have indeed done so. This web page still needs finishing off (in particular,…

    ... , M1 line, address and data bus lines. This can give you ... picture on the TV. The ROM masks out the Speccy's ... it works with a broken ROM. Then there's the battery ... tests, as well as a ROM CRC and interrupt test.
    Winston Winston June 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... had to change the data bus resistors from 470ohm to 680ohm ... upper bank, and from the ROM to the screen...

    Phu Phu June 2007 Hardware
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... had to change the data bus resistors from 470ohm to 680ohm ... upper bank, and from the ROM to the screen...


    Oooh, changing the data bus resistors sounds a bit complicated ...
    BloodBaz BloodBaz June 2007 Hardware
  • New Spectrum HardwareHi all. Well its Friday so it seems as good a time as any (business is a bit slack at the moment) to start up a thread about creating new Spectrum ha…

    ... a little modified Sinclair expansion bus, so if someone invents an ... very unclear.
    The firmware (ROM) of the machine is fully ... binary files for CPLDs and ROM. You'll have to order ...
    Sonic Sonic July 2007 Hardware
  • How do I clear only a specific area of a screen (quickly) in machine code ?I'm looking for a machine code routine which will clear the first 20 rows of the Spectrum's display (or any number of rows or columns) . I have found…

    ... /> LD A,32
    LOOP RST #10
    DJNZ LOOP
    ; The ROM routine gets the line start ...
    hldswrth hldswrth July 2007 Development
  • Eprom blowerdoes anyone know a site with plans for an eprom programmer project that'll blow 27C256s. I attempted to build one called Kisseprom, but the software …

    ... plugged in where the Spectrum ROM went.

    The nice ... just how I get the ROM images onto the diagnostics board ... got a data and address bus to play with).
    Winston Winston July 2007 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 ... good sign that the ROM is not working. If ... the ROM never chip selects, the ... all ROM locations, which is the machine code instruction RST #38 ... Therefore it'll just execute RST #38 instructions, and the ...
    Winston Winston July 2007 Hardware
  • +2B problem stillHi all, I have a spare +2B that still dont work. Richard kindly sent me 4 x 4464 ram chips but the +2B still dont work I have swapped over both ROM`s…

    ... chip, i.e. the Z80 bus comes in, multiplexed RAM busses ... the I/O lines, the ROM chip selects, etc. Its like ...
    Phu Phu July 2007 Hardware
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... an interrupt, yes? And the ROM scans the keyboard, from a ... the interrupt should trigger a RST 38h, and not one of ...
    Where's that AY chip gone... Where's that AY chip gone... August 2007 Chit chat
  • 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 ... . 0xFF is the RST 38 instruction, so lacking ROM altogether, the CPU ... just executes RST 38 instructions. The ...
    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 ... . 0xFF is 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 ...
    zub zub August 2007 Sinclair Miscellaneous
  • He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…

    ... an interrupt, yes? And the ROM scans the keyboard, from a ... the interrupt should trigger a RST 38h, and not one of ...
    Winston Winston September 2007 Chit chat
  • Multiple ROMsI'm mulling over the idea of a bit of hardware with a ROM in it, which has some commands that can be called by BASIC (like the old wafadrive star com…

    ... try to page its own ROM in (even when PC ... on all of these uses RST 8 for all functionality, and ... want to use some IF1 ROM commands (eg for Microdrive ... temporarily disable the divIDE+ etc ROM, do that and then re ... -enable the ROM.

    So, if ...
    glancaster glancaster September 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…

    ... 0x7FFF appears on the address bus, then the ULA [B] ... ULA address put on the bus, at least that's ... does not - it addresses the ROM or high RAM, while the ... (or inst. fetch) The address bus is stable at the start ... overs are left on the bus.

    [QUOTE]We ...
    Patrik Rak Patrik Rak September 2007 Emulators
  • IY RegisterIve got a really bizarre bug, and I have only just started using the IY register. I seem to remember reading somewhere in a programming book, to neve…

    When your code uses ROM-routines (i.e. RST 16 for print)
    then the real value of IY is needed for correct handling.

    Best is not to use IY or only when not calling ANY ROM routines
    Dr BEEP Dr BEEP September 2007 Development
  • Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…

    ... ). I managed to extract the ROM (after finding out how it ... noticed that when extracting the ROM... but what about POKE? Just ... 2" and "searching outside the ROM" nonsense. For some reason, I ... interfaces trying to drive the bus at once might not work ...
    zub zub October 2007 Hardware
  • A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…

    ... /> With the DivIDE, if an RST#8 is executed, or even ... /JP #8, the DivIDE ROM is paged in [I]after ... the case of a standard ROM, it will execute LD ... data taken from the DivIDE ROM. I think :)

    ... would be the "active" ROM and page itself over the ...
    icabod icabod October 2007 Hardware
  • SAM gets ethernetWhilst off topic - head over to [url]www.samcoupe.com[/url]. Colins got his ethernet board for the SAM available to buy and some interesting news ab…

    ... 8K pages, and any page (ROM, RAM, W5100 buffer) should be ... mappable (so you can have ROM in 0x0000-0x1FFF, W5100 in ... , or RAM in 0x0000-0x1FFF, ROM in 0x2000-2FFF) for greatest ... co-operate on things like RST #8 traps, interrupts, NMI etc ...
    Winston Winston October 2007 Hardware
  • Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…

    ... /> [QUOTE=Winston;223306]
    On RST #8 traps (or similar), they ... non-divide general rom and a DivIDE specific rom. Nice.

    LaesQ LaesQ October 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?

    ... not especially familiar with the bus, but surely that only works ... , causing it to lock the bus somehow? The thought occurs that ... of standby state. The Microdriver ROM is actually paged out when ... address space, though. There's ROM from $0000-$0FFF, RAM from ...
    zub zub November 2007 Hardware
  • Speaking of encrypted Roms from interfaces...Is the MicroSpeech Rom encrypted too? When examining it I've always wondered how they can print the Currah copyright on screen when there's no readab…

    ... =Cameraman;225363]Is the MicroSpeech Rom encrypted too?
    When ... readable Ascii text in the rom...
    :???:
    Frans[/QUOTE]< ... pins of data bus) . When you dump the rom of this interface ... this problem is putting the rom in the eprom programmer and ...
    Jose_Leandro Jose_Leandro November 2007 Hardware
  • Speaking of encrypted Roms from interfaces...Is the MicroSpeech Rom encrypted too? When examining it I've always wondered how they can print the Currah copyright on screen when there's no readab…

    ... pins of data bus) . When you dump the rom of this interface ... you had a no readable rom.[/QUOTE]

    This is ...
    icabod icabod November 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    [QUOTE=Winston;227947]
    Bus indirect mode's advantage is ... PCB layout because the address bus only needs to go to ... the eventual ethernet board's ROM and RAM, and then only ...
    lordcoxis lordcoxis November 2007 Hardware
  • Build your own Pentagon 1024SLAlexey aka KingOfEvil was so kind to give me an english manual for the Pentagon with most (except for the floppy controller) chips adapted to "wester…

    ... -5€) for the (optional) ZX Bus, both CPLDs and someone to ... for 1€ each), a 27512 ROM chip (usually 50 cents or ...
    Shockwav3 Shockwav3 November 2007 Hardware
  • The direct bus or indirect one... that is the questionThe Ethernet project continues...and I'm in a quandry. So I've managed to implement enough socket library for the W5100 that socket, bind, listen, a…

    ... am actually leaning towards bus indirect mode mainly because ... space in the Spectrum ROM starts. The CPLD will ... page in socket library ROM page and RAM workspace. ... traps (i.e. lower ROM traps) disabled with the jumper ... flash memory for the ROM with 4K sectors, so ...
    Winston Winston November 2007 Hardware
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... by default (not the spectrum ROM) and its default library uses ... may also suffer from some bus contention caused by video refresh ...
    JamesD JamesD December 2007 Sinclair Basic
  • Benchmark timeWell, the BASIC benchmark posted in Creative Computing back in the 80s came up as a topic on the AtariAge forums. The article is available online an…

    ... be the people writing the ROM weren't familiar with numerical ... Microsoft's expertise, the Spectrum ROM was lucky enough to have ... in point in the Spectrum ROM's calculator which is implemented ... may also suffer from some bus contention caused by video refresh ...
    Alcoholics Anonymous Alcoholics Anonymous December 2007 Sinclair Basic
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