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<1…14151617181920…34>
  • Problem with my speccy 48+My machine boots up but apon booting it freezes and you can see feint grey horizontal 1 pixel lines going down the screen. Is this fixable at all?

    ... 'supersize' text in the Speccy ROM) and the keyboard doesn't ... pins on the one keyboard socket to one of the pins ... on the other keyboard socket. All the keyboard membrane is ...
    Winston Winston April 2007 Hardware
  • Disassemblers and RSTsI think this is a longshot, but... is anybody aware of a disassembler that handles the Interface One RSTs? e.g. RST $10 DEFW $0020. Cheers

    ... version only suitable for IF1 Rom v1
    ;
    ... ;
    org $f900
    rst $08 ; f900 cf $0bts
    l_f909: rst $10 ; f909 d7 $0bts< ... cb 3f $08ts
    rst $10 ; f99a d7 $0bts ... ; fa1c 46 $07ts
    rst $10 ; fa1d d7 $0bts
    jp jp April 2007 Development
  • +2b not working with interface1i was trying to transfer some of my programs from my microdrive carts onto tapes last night, but found both my 48k and my toast rack 128K have decide…

    ... handled there. If via RST #08 in 48k ROM, it will be ...
    Sonic Sonic May 2007 Hardware
  • 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…

    ... doing any CALL to ROM or RST instructions in my own ... address 0x38 = 56 in the ROM.

    So ... made. That's the ROM routine for scanning the ... or with routines in the ROM code?
    [/quote]
    ROM code polls the keyboard in ...
    Alcoholics Anonymous Alcoholics Anonymous May 2007 Development
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... 'm almost sure that the ROM is causing problems. I found ... on the ROM IC itself (I removed it from the socket) have ... /> I'll look into replacing ROM with an EPROM - I have ...
    Avian Avian May 2007 Hardware
  • OT: Commode AmigaYeah don't shoot me....its in chit chat! I won a nice Amiga A500 setup this weekend on Ebay: [url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=0…

    ... 1.2, is the Kickstart ROM you have in your machine ... . For games, go for a ROM switcher and Kickstart V2.0 ... chip that slots into a socket on the Amiga motherboard. KS ...
    DEATH DEATH July 2007 Chit chat
  • OT: Commode AmigaYeah don't shoot me....its in chit chat! I won a nice Amiga A500 setup this weekend on Ebay: [url]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=0…

    ... 1.2, is the Kickstart ROM you have in your machine ... . For games, go for a ROM switcher and Kickstart V2.0 ... chip that slots into a socket on the Amiga motherboard. KS ... I get the Amiga. The rom switcher you mention, that sits ...
    beanz beanz July 2007 Chit chat
  • 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 …

    ... (in two places) so the ROM setting is at the Hitachi ... its not getting into the socket making contact).

    3 ...
    gtsamour gtsamour July 2007 Hardware
  • 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 …

    ... (in two places) so the ROM setting is at the Hitachi ... its not getting into the socket making contact).

    3 ...
    DEATH DEATH 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
  • 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…

    ... - which could be bad RAM/ROM/Z80 yadda yadda yadda.
    socket and takes two seconds to ...
    DEATH DEATH July 2007 Hardware
  • spectrum compatibilityI have read/heard conflicting statements from different sources regarding different spectrums with games. Can an expert/s say with certainty compati…

    ... a spectrum SE rom' for later machines which rom is this? If ... bug in a 'heatsink version' rom and that replacements were offered ... these versions have a socket as opposed this rom being soldered directly ... board but if replacing the rom with the Spectrum SE does ...
    naz2000007 naz2000007 July 2007 Hardware
  • Early Version Betadisk Manual (ie anybody have one)Folks, after lengthy excavations in my attic I have dug out my old Betadisk interface and 720K drive. However the manual has done missing. It's wa…

    If you can connect your Spectrum to a PC with EAR socket (connected to soundcard) you may load a ROM image from disk to RAM and then transfer it to a PC using BASIC tape SAVE command.
    So where are pictures?
    Sonic Sonic July 2007 Hardware
  • Early Version Betadisk Manual (ie anybody have one)Folks, after lengthy excavations in my attic I have dug out my old Betadisk interface and 720K drive. However the manual has done missing. It's wa…

    ... with EAR socket (connected to soundcard) you may load a ROM image ...
    Kilby Kilby August 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
  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…

    ... years ago I changed Spectrum ROM with Eprom 27C128
    and ... /> and plug into the original ROM socket. I also changed lower RAM ...
    superfo superfo August 2007 Hardware
  • Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…

    ... years ago I changed Spectrum ROM with Eprom 27C128
    and ... /> and plug into the original ROM socket. I also changed lower RAM ...
    DEATH DEATH August 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 ... . 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
  • 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
  • Wtf??I won this NZ auction earlier this week [url]http://www.trademe.co.nz/Browse/Listing.aspx?id=116509561[/url] and have been to collect the hardware th…

    ... and the ROM has been desoldered to fit a socket.

    ROM!

    [img]http://i40 ...
    Womble Womble October 2007 Hardware
  • Wtf??I won this NZ auction earlier this week [url]http://www.trademe.co.nz/Browse/Listing.aspx?id=116509561[/url] and have been to collect the hardware th…

    ... that to the 4116/4164/ROM/Z80CPU chips I've had ... matrix pins from the same socket does no good at all ...
    DEATH DEATH October 2007 Hardware
  • Wtf??I won this NZ auction earlier this week [url]http://www.trademe.co.nz/Browse/Listing.aspx?id=116509561[/url] and have been to collect the hardware th…

    ... that to the 4116/4164/ROM/Z80CPU chips I've had ... matrix pins from the same socket does no good at all ...
    guesser guesser October 2007 Hardware
  • Damn, I think I need a reflow ovenOr a reflow frying pan at least... I was just assembling an order through Farnell since I've worn out another soldering iron tip (which has actually…

    ... the SSOP near te USB socket:

    [url]http://www ... concede a DIP socketed flash ROM).
    Winston Winston October 2007 Hardware
  • 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…

    ... night, i quickly replaced ula, rom, z80 and the logic to ... seat them tightly on the socket and so far, the machine ...
    odious odious 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…

    ... off the edge connector traps RST #8. For instance, ... pages its rom in when it traps an RST #8 - ... that various different bits of ROM-equipped hardware trap?
    RST#8 traps and instead ... hardware with a shadow ROM use that system ...
    guesser guesser 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
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HitBox

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rom 15.6K 29.7K
rst 1.2K 2.5K
socket 4.3K 6.2K

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