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  • Spectaculator/Kempston/Spanish gamesWhen I use the kempston joystick emulation via the keyboard (cursor keys) in Spectaculator some Spanish games (e.g. Nonamed, Jungle Warrior) don't wo…

    Surely it's just a matter of partial decoding of the address bus. Ports of 1F and DF would suggest the Kempston interface responds to any address with the bottom 5 bits set.
    AndyC AndyC August 2004 Emulators
  • An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…

    ... 't do multicolour or floating bus though), and so are the ...
    GOC GOC August 2004 Development
  • An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…

    ... 't do multicolour or floating bus though), and so are the ...
    CKay CKay August 2004 Development
  • An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…

    [quote]
    On 2004-08-28 21:23, GOC wrote:
    Well, the emulator itself is functional (doesn't do multicolour or floating bus though), and so are the most of the main debugging functions
    [/quote]

    Any chance of a look at this?
    Woody Woody August 2004 Development
  • An emulator(another on of my projects) Does anyone know how to write an emulator? The emulated computer is very simple (a MK14, infact -also by Sir Clive) and a…

    ... 't do multicolour or floating bus though), and so are the ...
    cyborg cyborg August 2004 Development
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... one of these new Serial bus interfaces that are developed for ... you an internal/external serial bus to all hardware devices/PCBs ...
    pern pern August 2004 Sinclair Miscellaneous
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... (independent I/O bus). That will simplify the bus interface and gives ...
    secarica secarica August 2004 Sinclair Miscellaneous
  • Clone Project feedbackFinally i now have some time to start again with my clone project. I have decided to drop the 48k project and go directly on a 128k clone. This migh…

    ... (independent I/O bus). That will simplify the bus interface and gives ...
    pern pern August 2004 Sinclair Miscellaneous
  • Queries about loading schemesAccording to the review of Wizard's Lair in Crash issue 14: [quote]Wizard's Lair has an unusual fast loader, which makes the border flash in wide ban…

    ... one on the original Bubble Bus release of Starquake - headerless, normal ...
    Lee Tonks Lee Tonks September 2004 MIA/STP/SDP
  • I need ASM for random numberI need to generate a random pair of coardinates in asm so that x=random no between 0 and 31, y=random no between 0 and 23. Any ideas on how to code …

    Hi,

    You could use this one if someone founds out why it returns with a Integer Out of Range error. :(

    [code]

    ORG 32768
    LD HL, (23672)
    LD (_RANDOM_SEED), HL ; Initialize the seed for random ...
    horace horace September 2004 Development
  • Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…

    ... +3 is on the data bus and is contended in a ...
    Philip Kendall Philip Kendall September 2004 Development
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... CPU and the display RAM. Bus arbitration is a bit tougher ... dual ported RAM anywhere, so bus arbitration is going to be ...
    Sparky Sparky September 2004 Sinclair Miscellaneous
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... bug or not. The command "RST 38H" is the problem. Simply ... 38, which has the opcode RST 38H, thus making it jump ...
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... &view=auto"]after a RST 38[B]H[/B][/url ...
    Philip Kendall Philip Kendall September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    I think my RST command works OK - its just the address in memory that I jump to is wrong. All I need to know is what is the value of 38H in decimal (and RST 00h, 08h, 10h, 18h, 20h, 28h, 30h).

    :)
    MadDoc MadDoc September 2004 Development
  • I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…

    ... ROM image, there is another RST 38H command - thus setting up ...
    MadDoc MadDoc September 2004 Development
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... the data is valid on bus for writing.

    The ...
    klingler klingler September 2004 Sinclair Miscellaneous
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... dual ported RAM anywhere, so bus arbitration is going to be ...
    pern pern September 2004 Sinclair Miscellaneous
  • The incredible shrinking screendumpIn this topic I stated that I would be impressed if the screendump could be smaller than 37 bytes. [url="http://www.worldofspectrum.org/forums/viewt…

    ... /> NBYTE LD A,(HL)
    RST 16
    LD A,255 ...
    Dr BEEP Dr BEEP September 2004 Development
  • building a computerFor some reason having come of age (25 last feburary) I've begun to get the itch to build my on computer, i.e. from scratch, not plug together pc par…

    ... cpu, for example, performs certain bus sequences to read from memory ... what goes on in each bus cycle so that you can ...
    Alcoholics Anonymous Alcoholics Anonymous October 2004 Sinclair Miscellaneous
  • Sparky eZX-BASIC Project in need of FPGA ExpertYou probably are not familiar with this project, but it is a computer system based on Zilog's new eZ80 chip and the OS is a superset of ZX BASIC. Ju…

    ... The only way to introduce bus delays is to program ... pins properly. Since a bus request is only valid once ... clocks before it needs the bus.

    Sure, ... do any sort of bus arbitration is between each ... a benvolent and cooporative bus master of old, the ...
    Sparky Sparky October 2004 Sinclair Miscellaneous
  • Cobra - scrollingHi everyone, I have been studying some of the code in Ocean' Cobra game using a debugger, in the hope of improving my own scrolling routines. In cas…

    ... evil games which uses idle bus reads to synchronise its display ...
    Philip Kendall Philip Kendall October 2004 Development
  • Games not working on the plus 2a/plus3Can anyone please tell me the name of any games that would not work with the plus 2a/plus 3 even in 48k mode? Games that were simply not compatable …

    Cobra and Arkanoid spring to mind due to the floating bus issue.

    D.
    Dunny Dunny October 2004 Sinclair Miscellaneous
  • Games not working on the plus 2a/plus3Can anyone please tell me the name of any games that would not work with the plus 2a/plus 3 even in 48k mode? Games that were simply not compatable …

    There was a version of Cobra on a Plus 3 compilation disk: The Magnificent Seven, which must use some alternative to the floating bus.

    Derek
    dmsmith dmsmith October 2004 Sinclair Miscellaneous
  • Games not working on the plus 2a/plus3Can anyone please tell me the name of any games that would not work with the plus 2a/plus 3 even in 48k mode? Games that were simply not compatable …

    Just checked. The version of Cobra released by the Hit Squad doesn't use floating bus.
    dmsmith dmsmith October 2004 Sinclair Miscellaneous
  • Games not working on the plus 2a/plus3Can anyone please tell me the name of any games that would not work with the plus 2a/plus 3 even in 48k mode? Games that were simply not compatable …

    ... mind due to the floating bus issue.[/quote]
    There are ...
    secarica secarica October 2004 Sinclair Miscellaneous
  • Shoot-em-up gameHi everyone, For just over a month I have been working on a shoot-em-up game along the lines of Sidewize / Zynaps, ie. right to left scroller. It is…

    ... , but I use the floating bus to do it. I guess ... learnt recently that the floating bus can't be exploited on ...
    dmsmith dmsmith October 2004 Development
  • Shoot-em-up gameHi everyone, For just over a month I have been working on a shoot-em-up game along the lines of Sidewize / Zynaps, ie. right to left scroller. It is…

    ... , but I use the floating bus to do it. I guess ...
    TMR TMR October 2004 Development
  • Shoot-em-up gameHi everyone, For just over a month I have been working on a shoot-em-up game along the lines of Sidewize / Zynaps, ie. right to left scroller. It is…

    [quote]
    On 2004-10-07 17:13, dmsmith wrote:
    It is sync'd, but I use the floating bus to do it. I guess you must be using either SPIN or ZX32.
    [/quote]

    There's nothing wrong with SPIN's floating bus emulation.
    Woody Woody October 2004 Development
  • Shoot-em-up gameHi everyone, For just over a month I have been working on a shoot-em-up game along the lines of Sidewize / Zynaps, ie. right to left scroller. It is…

    Yeah, you're right. Seems the latest version on WoS is still v0.41, and that has a pretty poor implementation of the floating bus.
    Woody Woody October 2004 Development
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