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<1…12131415161718…34>
  • is it easy to learn z80 machine codewell is it?

    Hmm, my memory of Speccy ROM routines is hazy, but aren't you supposed to do a stream select before doing any RST 16s?

    [ This Message was edited by: AndyC on 2004-10-27 14:09 ]
    AndyC AndyC October 2004 Development
  • is it easy to learn z80 machine codewell is it?

    ... /> Hmm, my memory of Speccy ROM routines is hazy, but aren ... stream select before doing any RST 16s?

    [ This Message ...
    Dr BEEP Dr BEEP October 2004 Development
  • Games that cannot be completed due to bugs - the definitive listIt would be nice if the community of WoS compiled a list of all the games that are known to be impossible to complete due to bugs. Perhaps one day, a…

    ... the attributes are copied from ROM instead of RAM.
    38,34
    34 ... 37 Mountain Path 38,36,14,41
    38 Mountain Path ... 39 Stepping Stones 39,40,38,44
    40 By ... UP you will enter Room 38 Mountain Path
    ...
    Mr. Anonymous Mr. Anonymous March 2005 Games
  • How to detect 48k modeHow can you detect if a 128k machine is in 48k mode (from an emulation point of view, not via BASIC or machine code)? Checking the current rom? But …

    ... (tests a byte in the ROM, very ugly IMHO).

    38 ]
    Luca Luca March 2005 Emulators
  • Competition: Sadistick routine on Spectrum ROMMy vote goes to BEEPER at #03B5 Let's ear you pick! :) And a great BOHHHHHHHHHHHHH to Dr Ian Logan & Dr Frank O'Hara for their description about the…

    ... ,3
    CALL PUSH_BC
    RST #28
    DEFB #05 ; division ...
    DEFB #38 ; end-calc
    CALL PRT_FP ...
    AE.Vasconcelos AE.Vasconcelos May 2005 Development
  • Weird loaders; 1) Why? 2) How? (Curiosity question)Hello again. Sorry to be asking/posting so much today, but I've just arrived here and am plumbing the depths of nearly 22 years of making cups of te…

    ... /> On 2005-06-29 01:38, Digital Prawn wrote:
    Also ... subject... we "know" that the ROM loader uses 855 tstates for ...
    Philip Kendall Philip Kendall June 2005 Sinclair Basic
  • I'm so happy!I just won this! [url="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=8203781036&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1"]http://cgi.ebay.co.uk/…

    I totally overpaid on some rom cartridges i got a while ... sold a week later for 38 quid. However my latest Arthur ...
    psj3809 psj3809 July 2005 Sinclair Miscellaneous
  • PRINT AT in assembler Hello everyone, I am very new to this forums. Like perhaps many others I had a Spectrum as a child and did pretty much simple BASIC programming, bu…

    ... ,65 (character to display)
    RST 16
    [/code]

    RST 16, but does call some ROM instruction at ...
    Rickard Rickard July 2005 Development
  • Programming MC challengeIn the 80-ies I got the following assignment for a programming course. 2 16-bit values stored in #8000 and #8002 must be added together and stored i…

    ... />
    org #7fff

    rst 0 1

    org ... machines using Z80, you programmed ROM.
    (all Z80 starts with ...
    Dr BEEP Dr BEEP August 2005 Development
  • Want a Speccy Repaired?Maybe it's time to put my 'skills' to use.... Now that I've sourced some of the nastier transistors, I've fixed about 6 rubber keyed Speccys in the …

    ... boot now with original 48k rom, i tried to poke and ... , and then tried with 48k.rom.

    Now I'm ... on 2005-09-13 23:38 ]
    Timppa Timppa September 2005 Sinclair Miscellaneous
  • Which assembler to useHello again, another question. As I just started fiddling with assembler I used whatever tools were in front of me. In this case, the built-in assem…

    ... i.e. write a new ROM-routine which you can load ... a,"A" ; value = 65
    rst 16 ; print capital A
    Dr BEEP Dr BEEP September 2005 Development
  • New game submitted to the SGC"4 in A Row" by Crisis. Check it out: [url="http://www.ojodepez-fanzine.net/network/sgc/entries.php"]http://www.ojodepez-fanzine.net/network/sgc/ent…

    ... quite easily with all usable ROM-routines like keyboardscan, CLS, RST 16.
    Dr BEEP Dr BEEP October 2005 Games
  • 42 column text, Sinclair Print Utilities, etcI'm currently developing the next of the ZXIF text adventures - "43 Minutes" and, as a side issue, I'm really interested in 42 column text for this g…

    ... and look for calls to ROM address 5633 which sets the ... />
    No, it's true. 38 bytes from 23568 is the ...
    wilsonsamm wilsonsamm October 2005 Development
  • divIDE issuesI discovered a few issues with the divIDE hardware and FATware software that may be of interest to some people. 1. ROM paging If your Spectrum is a…

    ... a tape routine in ZX ROM is reached so firmware just ... must replace these instructions with RST XX (for example) and EEPROM ... , all programs that use standard ROM loader should be stored in ...
    baze baze October 2005 Development
  • Cool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …

    ... still a reset (effectively a RST 0h instruction).
    [/quote]
    RST 0h only clears PC.
    RST 0 instruction), if for instance ... I want an alternate ROM to stay in place, say ...
    Philip Kendall Philip Kendall November 2005 Sinclair Basic
  • Public Domain SoftwareFAO Andy Barker. [url="http://www.worldofspectrum.org/infoseek.cgi?regexp=^Screen+Compressor$&pub=^Mikropol$"]http://www.worldofspectrum.org/infosee…

    ... /+3 disk and uses normal ROM loaders. The whole point of ... on 2005-11-12 18:38 ]
    DEATH DEATH November 2005 MIA/STP/SDP
  • After roughly 22 years can you help?Hi, A long one this but here goes. Roughly 22 years ago (i was 14 if i remember right) i got a 48K speccy for christmas of my dad it was awesome an…

    ... someone explain what the instruction RST 16 actually does? ..
    [/quote ... ]

    Wrong way... RST 16 (or RST #10) is 1 byte ... what subruotine called with RST 16 does.
    RST 16 calls at ... : see for instance 'Complete Spectrum ROM Disassembly'
    piters piters November 2005 Sinclair Miscellaneous
  • After roughly 22 years can you help?Hi, A long one this but here goes. Roughly 22 years ago (i was 14 if i remember right) i got a 48K speccy for christmas of my dad it was awesome an…

    RST is for RESTART it's basically just a CALL to a subroutine. I don't think Necos needs to know in detail about it just what it can be used for.

    There are 8 RST's and are used for different purposes by the ROM.
    rich_chandler rich_chandler November 2005 Sinclair Miscellaneous
  • After roughly 22 years can you help?Hi, A long one this but here goes. Roughly 22 years ago (i was 14 if i remember right) i got a 48K speccy for christmas of my dad it was awesome an…

    ... /> On 2005-11-24 12:38, karingal wrote:
    Pretty good ... /> LOOP: LD C,A
    RST 16
    LD A,C ...
    Ian Hamilton Ian Hamilton November 2005 Sinclair Miscellaneous
  • ROM paging questionAssuming the Spectrum 128 memory map and port addresses, but two custom ROMs in place of the normal Editor and BASIC, what is the most efficient way …

    ... when you page from one ROM to another the PC register ... the instruction in the other ROM where you wish to continue ... :

    So when we RST the stack should be:
    RST after the bytes that defined ...
    cyborg cyborg January 2006 Development
  • What do you think.Do you think if you went back in time and made a Sudoku game for the spectrum you would be a millionaire now? (all my get rich quick schemes invole …

    ... possible like 128K
    32K ROM, 16K Spectrum + 16K ZX81
    I would use 1 RST for jump to own routine ... /> So I can use a RST for a call to my ...
    Dr BEEP Dr BEEP February 2006 Games
  • Z80 based computersHelp needed: Who can tell which computers besides ZX81/ZX80/Jupiter Ace/SAM Coupe: 1) use a Z80 processor 2) what the programmable RAM-size is (and…

    ... (and start/endaddresses)
    3) ROM size
    3) what videomode ... of porting the Jupiter Ace ROM
    to the other machines ... 'translated' Jupiter Ace ROM ( I only need to alter 100 RST calls)
    Dr BEEP Dr BEEP February 2006 Sinclair Miscellaneous
  • Z80 based computersHelp needed: Who can tell which computers besides ZX81/ZX80/Jupiter Ace/SAM Coupe: 1) use a Z80 processor 2) what the programmable RAM-size is (and…

    ... ' Jupiter Ace ROM ( I only need to alter 100 RST calls)
    obo obo February 2006 Sinclair Miscellaneous
  • Assistance with IM2 routineI subsequently got a working IM2 routine.

    ... you're jumping to the ROM to read the keyboard, have ... that your pops following the RST won't happen because of ... you got the ROM paged in when you RST :) ?


    Alcoholics Anonymous Alcoholics Anonymous March 2006 Development
  • Homing missile routine - help neededI am attempting to write a routine which will allow a missile to home in on a player. Basically the sort of thing you see in most shoot-em-up games. …

    ... use the FP Calc (RST 28) in the Rom, but this would ...
    dmsmith dmsmith March 2006 Development
  • Spectrum SE - a legal cloneI obtained permission to use the Z80 version of BBC Basic with a Spectrum clone. Open82 is looking like a better choice now.

    ... for a mostly-compatible alternative ROM containing no Amstrad code. Currently ... than a font and an RST 16 routine, but hopefully it ...
    gasman gasman March 2006 Hardware
  • how to pass arguments from Basic to MC ?can someone explain me (or give some link) how to pass arguments from basic to machine code? i mean something like this: PRINT USR xxxxx, arg1, arg2:…

    ... /> ORG NN

    start RST #20 ; scan over ,
    CALL ... .CO.UK for position in ROM )
    RST #18
    CP ","
    Dr BEEP Dr BEEP April 2006 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…

    ... 0x66 is located in the ROM.

    Maskable interrupts, unlike ... typically be a single-byte "RST n" instruction that effectively causes ... Basic runs in and the ROM code at address 0x38 does ... . Since 0x38 lies in the ROM we cannot change the code ...
    Alcoholics Anonymous Alcoholics Anonymous May 2006 Development
<1…12131415161718…34>

Latest Posts

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