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<1234567…34>
  • +3 BASIC and RST 8I've been working on adding commands to the BASIC interpreter, in a similar style to how Interface 1 does it (catch the RST 8 error trap). This works…

    ... 1 does it (catch the RST 8 error trap). This works perfectly on ... a 48k, a 128k (in either RST ... under 48K BASIC or in RST 0 mode.

    But ...
    Winston Winston February 2009 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…

    ... trap).
    - 0x0008 - when the RST8EN jumper is closed (allowing RST 8 ... and exits, except for the RST 8 trap which does an extremely simple ... there, and do the RST 8 style trick of passing a ... disassembly" especially with regards to RST 8 traps.

    Oh ...
    Winston Winston December 2007 Hardware
  • Understanding extensions to the BASIC parserFor a while, I've had a rather 'rinkety dink' extension to BASIC via an RST 8 trap in hardware, just so that I can send stuff to a Spectrum over ethe…

    ... ' extension to BASIC via an RST 8 trap in hardware, just so that ... need to do when intercepting RST 8 to parse your own command ...
    Winston Winston March 2008 Development
  • 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…

    ... co-operate on things like RST #8 traps, interrupts, NMI etc. The ... usable even if things like RST#8 trap contention can't be sorted ...
    Winston Winston October 2007 Hardware
  • How to add basic commands like "!command"Hi all, is there some where in the forums a thread dealind with the topic how to add basic commands? How are the commands for example of Basic+ are …

    Fascinating. I had always presumed BASIC extensions required an RST 8 trap... that actually might be quite handy information.
    Winston Winston December 2007 Sinclair Miscellaneous
  • 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…

    ... what is done during an RST 8 trap and subsequent return to the ... Interface 1 (or any other RST 8 trap device), an OUT instruction will ... the ethernet board gets the RST 8 or whether the downstream device ... gets the RST 8. So a BASIC program ...
    Winston Winston March 2008 Hardware
  • 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…

    ... give me some hints on RST 8 trapping, what needs to be ... what is done during an RST 8 trap and subsequent return to the ... point, but your $3ffe/$3fff trap sounds a better solution for ...
    glancaster glancaster March 2008 Hardware
  • How many expansions can a Speccy handle ?How many expansions / interfaces / addons can a Speccy handle ? I'm not thinking about the issue of powering the interfaces through the Speccy's PS…

    ... an RST 8 trap (an academic exercise, because only one device can actually trap RST 8 ... selects which device gets to trap RST 8) then you would slow down ...
    Winston Winston March 2008 Hardware
  • 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…

    ... to do an RST 8 trap at any time (because RST 8 traps bring along ... that use RST 8 , because only one device can own RST 8 ). The ROM ... requiring any ROM trapping, the RST 8 trap infrastructure still needs to be ...
    Winston Winston July 2008 Development
  • Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…

    ... is handled via the RST 8 trap, but if the RST 8 trap is disabled because ... the Spectranet ROM, because, well - RST 8 has been disabled by the ...
    Winston Winston January 2009 Development
  • Keyboard routinesI'll ask here first - since this must be a long-ago solved problem, and hopefully I can avoid re-inventing the wheel... I need a keyboard routine th…

    ... is handled via the RST 8 trap, but if the RST 8 trap is disabled because ... the Spectranet ROM, because, well - RST 8 has been disabled by the ...
    rich_chandler rich_chandler January 2009 Development
  • Implementing goto on error condition...OK, so when I'm reading a file or directory on a network filesystem, when I reach EOF, it's not actually useful at all for ZX BASIC to stop the progr…

    ... all (and having all the RST 8 trap hairyness to contend with), and ... return a byte, nothing, or 8 End of file. In reality ... many more things other than 8 End of file that can ...
    Winston Winston October 2009 Development
  • 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, the Sinclair ... in when it traps an RST #8 - presumably when the program ... to tell it to trap something other than RST#8. (Does the DivIDE ... a hardware jumper that disables RST#8 traps and instead tells the ...
    Winston Winston October 2007 Hardware
  • Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …

    ... and streams without needing to trap RST 8 and extend BASIC.

    trap error F (Invalid file name ... resources to add yet another trap. Then a subsequent CLOSE # to ...
    Winston Winston July 2008 Development
  • Implementing goto on error condition...OK, so when I'm reading a file or directory on a network filesystem, when I reach EOF, it's not actually useful at all for ZX BASIC to stop the progr…

    ... to stop the program with 8 End of file. Really, what ... it - see error 8 (error code 7) when RST 8 fires, then set ... that I do if I trap Nonsense in BASIC itself to ...
    Winston Winston October 2009 Development
  • Detecting TR-DOS from BASICIs there a simple (or contrived :D ) way to detect the presence of a TR-DOS/Betadisk interface from BASIC? For fairly obvious reasons this can't rel…

    ... code from machine code and trap the error. Send something that ... being you still have to trap the error routine yourself or ... haven't seen anything about RST 8 hooks on TR-DOS...
    pissedbob pissedbob January 2006 Development
  • 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, the Sinclair ... in when it traps an RST #8 - presumably when the program ... to tell it to trap something other than RST#8. (Does the DivIDE ... a hardware jumper that disables RST#8 traps and instead tells the ...
    guesser guesser October 2007 Hardware
  • Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…

    ... ]

    How does ResiDOS trap RST 8 execution to page in for ... M1 for the case of RST 8 traps)
    Winston Winston June 2008 Hardware
  • Faulty M1 pin on a Z80 made from SGS?It's the second time I have come across this: a Spectrum that seems to work ok, but if I attach an Interface 1 or a DivIDE to it, it behaves as is no…

    ... =Winston;277805]How does ResiDOS trap RST 8 execution to page in for ... M1 for the case of RST 8 traps)[/QUOTE]

    It ...
    glancaster glancaster June 2008 Hardware
  • Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …

    ... and streams without needing to trap RST 8 and extend BASIC.

    trap error F (Invalid file name ... Interface 1 developers, I could trap a carriage return and flush ...
    Geoff Geoff July 2008 Development
  • 16K Rom with RS232 supportHi all, I am looking for a 16K Rom-code (to fit into the speccy) which supports RS232 and Network of IF1. Background: I am using 48K Issue 3 with W…

    ... content. How to realise the trap in?[/QUOTE]

    The ... a problem because it traps RST 8. You'd have to rewrite ... to use something other than RST 8 to handle errors, and then ...
    Winston Winston November 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…

    ... using the Basic LOAD command trap of the divIDE ?[/QUOTE]
    RST 8 connect IF1 external eprom 8kB ... adress:
    #0000 = reset/rst 0
    #0008 = RST 8
    #0038 = IM1 ...
    velesoft velesoft January 2009 Hardware
  • +3 BASIC and RST 8I've been working on adding commands to the BASIC interpreter, in a similar style to how Interface 1 does it (catch the RST 8 error trap). This works…

    ... solution is:

    error trap RST 8
    preserve error states
    hand back to original RST 8 routine

    no testing ...
    chev chev February 2009 Development
  • 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 …

    ... not talking of a similar trap to RST 8, but a one time ... - functionally, the same as a trap). Otherwise, the ROM wouldn't ...
    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…

    ... whether to trap the relevant addreses or not.

    RST 8 traps ... the Spectranet to disable all RST 8 traps. For use with a ...
    Winston Winston August 2009 Hardware
  • DivIDE QuestionHi all, I've been trying to work out how the DivIDE works and after reading and re-reading the DivIDE programming model document by Zilog I think it…

    ... works like this) will trap CPU execution at a certain ... stack that tells your RST 8 handler that you're ... are zeropage.asm (the RST 8 initial entry point), the ... />
    [code]
    rst CALLBAS (actually, RST 16)
    defw ADDRESS_TO_CALL ...
    Winston Winston August 2009 Development
  • The Goldfinch updates thread([url=http://www.worldofspectrum.org/forums/showthread.php?t=25034]original announcement thread here[/url] - I figured it was worth starting a new to…

    ... isn't it possible to trap the LOAD "" CODE command ... really limiting) possible to trap any of LOAD/SAVE ... from the entry points, RST 8 and NMI, there's ... just go through the RST 8 entry point along with ... (by using that programmable trap I mentioned earlier) and ...
    Winston Winston September 2009 Development
  • 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…

    ... />
    There is a programmable trap that can be set to ... There's also an RST #8 fixed hardware trap normally used to intercept ... 0x033B enables/disables the programmable trap. There is an API that ... for things like the tape trap etc. rather than the debugger ...
    Winston Winston November 2016 Development
  • Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…

    ... the last instruction with RST 8 making block 2 into ... Decrement key loop counter
    RST 08[/code]

    ... 1 and replace our RST 8 with original value of ... of JIT where you trap all jumps and redirect ... the software. Because I trap every jump I can ...
    tstih tstih March 2022 Development
<1234567…34>

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