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  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... .

    Including a real Z80, real SRAM and a microcontroller ... tool chains.

    My initial design would be to have ...
    cbmeeks cbmeeks October 2015 Vega
  • The I register and IM 1Hi al! I've been doing some coding, replacing the BASIC ROM with my own code and upon examination of a few 16Kb cartridges, all the ones I've look…

    ... .

    During refresh, the contents of the I register are ... full details [url=http://www.z80.info/z80_faq.htm#Q-1 ...
    1024MAK 1024MAK November 2015 Development
  • Were there other graphic modes for the ZX Spectrum?I've read that there was a "hi-color" mode that allowed the color clash to be 8x1 instead of 8x8. Maybe I have the name of that mode wrong. I'm…

    ... was build up by the Z80 CPU doing half the work ... is not a lot the Z80 CPU can do to change ... do is to change the contents of the screen memory before ...
    1024MAK 1024MAK November 2015 Hardware
  • Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…

    ... than (DE) addressing, http://www.z80.info/z80code.txt claims that ... 2 pixels on screen (thus initial Y will be always even ...
    Sol_HSA Sol_HSA November 2015 Development
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... data to feed to the Z80 via (emulated) port $FE.
    initial logo drawing takes a lot ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • Vega ARM SOC?I read that the core of the new Vega was an ARM SOC. I thought it would have been an FPGA. But it seems it's an ARM running an emulator. Anyone kn…

    ... precise timing. The time each Z80 instruction spends on every instruction ... it affects timings in the Z80 is known, so one can ... FEh
    ld a,0 ;initial border color
    ld d ...
    mcleod_ideafix mcleod_ideafix December 2015 Vega
  • z88dk v1.99A Release Candidate[b]Z88DK VERSION 1.99A RELEASE CANDIDATE[/b] Download from: http://nightly.z88dk.org/Releases/ The release candidate will be available for te…

    ... are supplied for three initial targets: embedded (generic z80), cpm, zx (zx ... ticks is a command line z80 emulator able to exactly measure ... companion decompression subroutines in the z80 library.
    [appmake] +rom added ...
    Alcoholics Anonymous Alcoholics Anonymous December 2015 Brand new software
  • Help! I'm learning Machine Code...Having decided to take the plunge and learn to machine code a while ago, I have started in earnest using the much recommended 'Mastering Machine Code…

    ... meaning:

    In Z80 assembly (and possibly other CPU ... bit value between brackets means: "contents of memory location ". A 16 ... 's (just?) one exception in Z80 assembly:

    [code ... can simply enter a few Z80 instructions, place a cursor, ...
    RetroTechie RetroTechie February 2016 Development
  • I don't think I'm getting the $22AA Pixel-Add rom routineDear all, I'm misunderstanding how the PIXEL-ADD rom routine works. My code... [code]ld b,175 ld c,1 call $22AA ld (hl),a ret[/code] So…

    ... ;> A. However since the Z80 can only shift/rotate one ... the bit pattern to its initial value.

    There are ...
    GReW GReW March 2016 Development
  • 48K Memory MapHi, I'm having some trouble understanding the top of the 48K Memory Map. From reading elsewhere I have this as the memory map: 0 to 16383 - …

    ... the available RAM and the contents in each section. So areas ... the system variables, or in Z80 registers.

    RAMTOP is ...
    1024MAK 1024MAK March 2016 Development
  • A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…

    The version for the new c library is split between two files. One holds the C code and the other holds the asm stuff. The compile lines are listed at the top of demo.c. "q" increases the number of sprites, "a" decreases the number of sprites, "p" ...
    Alcoholics Anonymous Alcoholics Anonymous June 2016 Development
  • The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…

    ... the 8 KiB ROM's contents in a 16 KiB image ... red border with black screen contents on bootup, shortly followed by ... , do we agree that at Z80 reset (including power-up), the ... is quick enough, when the Z80 "captures" the instruction data from ...
    1024MAK 1024MAK July 2016 Hardware
  • Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…

    ... am thinking some form of Z80 aware IDE that allows code ... , examine registers, flags and memory contents.

    Am I living ... tools like this exist for Z80? Sort of a BasinC for ... Z80 would be perfect! :-)

    ...
    Paddy Coleman Paddy Coleman September 2016 Development
  • ZX Spectrum CartridgesI have been thinking of "cloning" ZX Cartridges for a while (case, board and silicon skirt), to be able to make new releases or replace damaged cartr…

    ... Taking into account Z80 format and it's contents, there is a ... minor problem to solve. :D

    Z80 ... to have access to ROM contents (allow paging in 16KByte ... Another possibility is to keep contents compressed, and provide a tiny ...
    RMartins RMartins October 2016 Hardware
  • 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…

    ... /> [b]- get registers...returns the contents of all registers[/b]
    Z80) and your .CDB file to ... as C source code and Z80 asm code. You could set ... replace RST command with previous contents of that location. It would ...
    tstih tstih November 2016 Development
  • how to fix instructions on screenI have a problem with my sequencer. I want the top half of the screen to stay fixed but allow the note values to print without pushing the instructio…

    ... will destroy the contents of some of the Z80 registers, so to ...
    The_Bert The_Bert November 2016 Sinclair Basic
  • How would you approach parallax?So ... there is this trick by Joffa that we all know...of waiting for the ULA to reach certain pattern on the screen using the IN command. And then s…

    ... is true that it rotates contents. But it does it through ... .e. bit 7 of the initial value goes both to the ...
    Hikaru Hikaru December 2016 Development
  • How would you approach parallax?So ... there is this trick by Joffa that we all know...of waiting for the ULA to reach certain pattern on the screen using the IN command. And then s…

    ... is true that it rotates contents. But it does it through ... .e. bit 7 of the initial value goes both to the ...
    tstih tstih December 2016 Development
  • Spectrum 48+ 4S - Upper RAM issue, and now a self-created problem!I recently picked up a known-flaky spectrum off eBay, to have a bit of fun fixing it and reliving youth. It was labelled as 'keyboard duff, shows…

    ... an instruction, the Z80 automatically outputs the contents of the R register ... feeds A0 to A7, the contents of the I register goes ... to A15. Every instruction, the Z80 increments the value held in ...
    1024MAK 1024MAK December 2016 Hardware
  • What should your speccy have come with ?:) I was thinking about this earlier. What changes should of been made to the Speccy when you purchased yours ? Realistically this topic really…

    ... a floating-point unit for Z80 based computers. It is a ... multicolour screen modes using a Z80 DMA Z84C1008 running at 8MHz ... a separate purchase. Despite the initial cost at the time for ...
    retrogod retrogod January 2017 Sinclair Miscellaneous
  • ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…

    ... those to work.
    Standard Z80/SNA/TAP files are located ... try and update the eeprom contents from the spectrum. Software is ... /> In a nutshell: [b] Compressed Z80/SNA/TAP files will work ...
    Dan Dare Dan Dare January 2017 Hardware
  • The Complete Machine Code Tutor - bug?Dear all, I'm having a fiddle with The Complete Machine Tutor and have come to the bit where they're adding registers together. The image on the l…

    ... ROM) is 243. So showing contents of HL, which is what ... the image is showing the initial status of the program where ...
    thricenightly thricenightly February 2017 Development
  • Memory questionsQuestion 1: PRINT PEEK 23732+256*PEEK 23733 returns 65535 for a 48K Spectrum and 32767 for a 16K Spectrum. PRINT PEEK 16388+256*PEEK 16389 return…

    ... with Issue numbers, only the contents of bits 5 to 7 ... bit wise AND (as in Z80 machine code) not a ZX ...
    1024MAK 1024MAK March 2017 Sinclair Miscellaneous
  • Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…

    ... write operation would contaminate the contents of an NVRAM.

    z80 computer to allow in-circuit ...
    Alcoholics Anonymous Alcoholics Anonymous March 2017 Hardware
  • Spectrum Use for ZX81 Pseudo Hi-ResHi Folks, I've been looking around at some of the "Hi-Res" stuff which was achieved on the ZX81 and I came across the faq https://www.landley.net/…

    ... ZX80 and ZX81 use the Z80 CPU to get the data ... the CPUs help, using the Z80 CPU refresh cycle)).

    Z80 refresh cycle (actually designed to keep the contents of ... data and arrange for the Z80 refresh address to grab the ...
    1024MAK 1024MAK April 2017 Assembler
  • Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…

    ... bus should float high. The Z80 CPU will read this as ... ), the CPU will push the contents of the program counter onto ... (and wraps around) as the contents of the PC is repeatedly ...
    1024MAK 1024MAK April 2017 Hardware
  • z80 Helper?When you are programming with z80 do you get 'lost' you are in the middle of making a routine and you can't remember which registers are holding val…

    Document the register contents at important locations ... keep track of stack contents when that gets complicated ... master/libsrc/_DEVELOPMENT/alloc/malloc/z80/asm_heap_realloc_unlocked.asm#L328
    ... here that the register contents are continually documented and ...
    Alcoholics Anonymous Alcoholics Anonymous April 2017 Development
  • endless runner project..So I'm thinking of writing a small tutorial series on writing games for the speccy in C, and figured that an endless runner would be an easy example …

    ... to, say, the contents of Z80 registers at some point ... C programming on the z80 is not about pure ... in the context of the z80, is a real disadvantage ... pages, smaller than any z80 book and about the same ... to mention that the z80 c compilers mostly implement C90 ...
    Alcoholics Anonymous Alcoholics Anonymous May 2017 Development
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Latest Posts

  • I am currently watching.....
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    John Elliott on April 21
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