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<1…18192021222324…34>
  • 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…

    ... calling the ZX ROM is handled via the RST 8 trap, but ... if the RST 8 trap is disabled because ... return from ZX ROM, not the Spectranet ROM, because, well - RST 8 has ... longer depend on the ZX ROM).[/quote]
    So that would ...
    rich_chandler rich_chandler January 2009 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…

    ... TIMEX 2048 use compatible ZX48 rom but TIMEX 2068 use ... incompatible modified rom 24kB = incompatible computer ... software = unusable without modifications(rom replacement). If any ZX ... with ZX rom for best compatibility + system bus convertor for ...
    velesoft velesoft January 2009 Hardware
  • 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…

    ... able to change the ROM addresses that are checked, ... any interface with external rom/sram memory, must be ... on detect timex 2068 rom and patched system(or ... used extra version of rom type for TIMEX 2068 ... rom, but enterpoints to tape routines is identical (also RST ...
    velesoft velesoft January 2009 Hardware
  • 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…

    ... connect any interface with external rom/sram memory, must be after ... /power-on detect timex 2068 rom and patched system(or used ... extra version of rom type for TIMEX 2068 ). All ... ZX48 rom, but enterpoints to tape routines is identical (also RST xx ...
    roko roko January 2009 Hardware
  • 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
  • Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…

    ... (assuming you are not in ROM):
    [CODE]
    LD (END ... . This is commonly seen in ROM with RST commands, but you can ... 82 ; location of RET in ROM
    DEC SP
    DEC ...
    Patrik Rak Patrik Rak January 2009 Development
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... ...

    CHANGE THE DATA BUS SEPARATOR RESISTORS.

    When ... impedance somewhere - Making the data bus resistors a higher value (say ... " from the CPU reading the ROM onto the data the ULA ...
    Phu Phu January 2009 Hardware
  • Assembler snippetsI was just thinking that a thread for small but useful assembler snippets to do useful things would be cool for people learning z80 coding. Not to me…

    ... /> Intrupt must be enabled so ROM can set time.

    LD A,":" ; display seperator
    RST 16
    DEC HL ; goto ...
    Dr BEEP Dr BEEP January 2009 Development
  • How does the Speccy deal with the Character Set?Hi All, Can anyone spare a little time to explain to me the basic Assembly method of how the Speccy interprets and retrieves Characters to print on …

    ... asm method is to use RST 16. This is the Spectrum ... done.
    ret z
    rst 16 ; print the character
    ROM, and copy it to the ...
    Winston Winston February 2009 Development
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    ... ...

    CHANGE THE DATA BUS SEPARATOR RESISTORS.

    When ... impedance somewhere - Making the data bus resistors a higher value (say ... " from the CPU reading the ROM onto the data the ULA ...
    RetroTechie RetroTechie February 2009 Hardware
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... already page RAM into the ROM area, there's really no ... . DIVIDE detect only acces to rom area and connect external memory ... ROMOE signals on ZX bus to +5V (disable rom)

    If ...
    velesoft velesoft February 2009 Hardware
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... ULA ever drive the data bus on a +3 and how ... ula is connect to CPU,ROM,ZX BUS. If CPU will read ... ULA return data to ZX bus (slow ram is not connect ...
    velesoft velesoft February 2009 Hardware
  • DivIDE on Spectrum +3Hi all, Is it possible to use the DivIDE on the Spectrum +3 in 128K mode? I have the 'A' jumper set on the board, but my +3 resets into 48K mode wit…

    ... ula is connect to CPU,ROM,ZX BUS. If CPU will read ... ULA return data to ZX bus (slow ram is not connect ...
    Winston Winston February 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…

    ... 128K commands. Therefore the same ROM is being used for interpretation ... with the standard 48K BASIC ROM (ROM3) since this gets ... actions when calling any standard ROM routine other than RST10, RST18 ... just use:

    [CODE]rst $28
    defw $0556[/CODE ...
    glancaster glancaster February 2009 Development
  • +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…

    ... commands. Therefore the same ROM is being used for ... />
    error trap RST 8
    preserve error states ... error states
    set ROM 1-Syntax (which will ... set ROM 1-BASIC on non ... br /> hand back to original RST 8 routine

    chev chev February 2009 Development
  • Interrupts - been a while !Not sure if this is the right place for this (1st post on WOS, but been a speccy user since Dec'84 :-o (yes I am that old ! :p) ), But I can't for …

    ... there is in the 48K ROM, but there is 0xffff at ... is throwing stuff onto the bus an interrupt time. The same ... +2, but the relevant +3 ROM has 0xffff at 0x3bff.
    Philip Kendall Philip Kendall March 2009 Sinclair Miscellaneous
  • TIMEX Sinclair 2068 => ZX Spectrum/Timex2048?Hello. I have opportunity to buy Timex Sinclair 2068. According to www sites dedicated to Timex machines, TS 2068 can handle only 7&#37; (!) of Spe…

    ... . You need a totally unmodified ROM for that (any emulator cart ... , different T-states, no floating bus on port #FF). More than ...
    >sticking the original ROM in place of the HOME ... ROM. You can then emulate the ...
    Mister Beep Mister Beep March 2009 Hardware
  • 2 commands in 1 lineHi all, this is my first post although I have visited the web site many times, and I find it great. English is not my mother tongue, so I will try to…

    ... there was room enough in ROM for all those new functions ... using the error handling routine (RST #8 ). I have been debugging ... help of The Complete Spectrum ROM Dissassembly and I think it ... /> SCF
    CALL $556
    RST 8
    DEFB 255
    rinconete rinconete March 2009 Sinclair Basic
  • 2 commands in 1 lineHi all, this is my first post although I have visited the web site many times, and I find it great. English is not my mother tongue, so I will try to…

    ... there was room enough in ROM for all those new functions ... single character tokens before the ROM checks syntax so BASIC is ... 3 characters.

    Using RST $08 seems OK.
    Geoff Geoff March 2009 Sinclair Basic
  • Pera Putnik's Simple CF interfaceHello world. Has anyone else built one of these and had it working? Mine kind-of works occasionally, but only for a 16mb card with the 'setup' imag…

    I've got some more cards but I am resigned to the fact that I'll have to do some more soldering, trying to reduce bus loading. Which ROM image are you using? I'll be trying this in a 48k plus.
    sirmorris sirmorris March 2009 Hardware
  • BSDOS 309 for MB02+ by DuskyI heard, there is a new version of BSDOS 309 for the MB02 disc interface coded by DUSKY (Nick: UB880D). I have three pieces of MB02 (including a prot…

    ... and contain more patches of RST points, NMI, Divide/Divide+/MB02 ... compatibility. One version of BS-ROM+BS-DOS is compatible with ...
    velesoft velesoft April 2009 Sinclair Miscellaneous
  • New Spectrum owner - Newbie questionsHi, I just got my first Spectrum in the post today +2a) and I'm looking for some advice on a couple of things: Firstly I'm not the biggest fan of j…

    ... parts of +2A expansion bus is the ROM Switching part and 9 ...
    LCD LCD April 2009 Hardware
  • New Spectrum owner - Newbie questionsHi, I just got my first Spectrum in the post today +2a) and I'm looking for some advice on a couple of things: Firstly I'm not the biggest fan of j…

    ... parts of +2A expansion bus is the ROM Switching part and 9 ...
    GingerDave GingerDave April 2009 Hardware
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... ; end printing if so
    rst 16 ; do the printing of ... /> The BASIC-interpreter in the ROM makes sure this is done ... then the printroutine from the ROM is used to print the ... character.
    The ROM-routine excepts the character to ...
    Dr BEEP Dr BEEP April 2009 Development
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... which doesn't use the ROM or system variables.[/quote]
    bus - so now I guess I ...
    szeliga szeliga April 2009 Development
  • Successor to the SpeccyBased on the rambling on the other thread it would be interesting to see what people felt was the 'spiritual' successor to the speccy. Amiga here....

    ... of its circuitry, bar the ROM, RAM and CPU, integrated into ... 68008 on an 8-bit bus which, combined with a number ...
    Matt_B Matt_B May 2009 Chit chat
  • Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …

    ... in a,(c) ; read floating bus on cycle 14338

    bus on cycle 14339

    ret z
    rst 16
    jr textout
    Bob Stains Bob Stains May 2009 Development
  • Need to read code start and length from a +3 diskso i can transfer them to my internal ZXMMC interface and my mind has died as to how to do it (i know how to for a tape) any help or a general kick i…

    ... back to the 48 BASIC ROM.
    ;
    finish:
    push ... /> ;
    ; TODO: Handle errors with RST 8 rather than returning them ...
    John Elliott John Elliott May 2009 Sinclair Miscellaneous
<1…18192021222324…34>

Latest Posts

  • I am currently watching.....
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HitBox

Word Docs Hits
rst 1.2K 2.5K
rom 15.6K 29.7K
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