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Machine code routine neededHello! Please i'm looking for a short routine that can write the same value in a range of continous memory locations. For example, to write 255 val…
... thousand times instead, but registers in the Z80 are eight bits wide ... -
Z80, and 6502, in comparisonI was wondering about how each of these compared in terms of performance. The Commodore 64 had a 6502 @ 1MHz, and graphics processor VIC which took …
... In reality a 2.5MHz Z80 and a 1MHz 6502 are ... use of memory) the Z80 wins, but often at the ... to running out of registers on the Z80.
But if ... register to register operations, the Z80 wins.
... video RAM that the Z80 CPU can directly access ... -
Z80, and 6502, in comparisonI was wondering about how each of these compared in terms of performance. The Commodore 64 had a 6502 @ 1MHz, and graphics processor VIC which took …
... register to register operations, the Z80 wins.
And ... mapped video RAM that the Z80 CPU can directly access ... lack of ANY 16 bit registers.
The 6809 ... over the 6502, and Z80 in most of the code ... , and 3.5 MHz Z80, but that's probably ... -
Z80, and 6502, in comparisonI was wondering about how each of these compared in terms of performance. The Commodore 64 had a 6502 @ 1MHz, and graphics processor VIC which took …
... very fastest instructions on the Z80 takes four ticks. You can ... as fast as the Z80. The lack of registers (especially the 16 ... -bit paired registers) makes it ... as 256 possible quick-access 'registers' then you can see how ... -
+3 - beeper sounds but no AY musicHi guys I am repairing a plus 3 revision 2 board that had no sound at all. Using schematics from https://zxnet.co.uk/spectrum/schematics/ I manage…
... a usable sound out, the Z80 CPU had to turn the ... the Z80 CPU has to do is set the internal registers in ... -
New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... -------------------------------------------------------------------------------
usage: Z80onDSK input.z80 number [options]
-s ... /> [code]
Z80onDSK snapshot.z80 1
[/code]
... This will de-compress the z80 snapshot, re-order, ... -
What to write / programme?I've been trying to get back some motivation to write something in machine code for the Spectrum. I don't feel I am organised enough to write somethi…
... sometimes, not in the actual Z80, but they sometimes require one ... Spectrum in mind, but just Z80 chip. But its one of ... I told myself 'LD' (the Z80 mnemonic for Load, but nothing ... , we are limited to internal Z80[i]registers[/i] which you could ... -
Strange Microdrive format.Hi all, I got a new (old?) cartridge today and it's called "ArchBak" and just ran forever in my Spectrum when I did a CAT. However when I looked d…
... is done in hardware. The Z80 doesn't "bitbang" the ports ... does the rest, with shift registers, interleave and bit rates all ... -
Why not more interest in C?Just curious. Not trying to provoke anything other than a discussion here. It would seem (to me) that it would be better for "Z80 beginners" to wr…
... to Z80. Older CPU designs have very limited numbers of registers and ... they're not entirely general purpose. Hand coded Z80 ... -
Why not more interest in C?Just curious. Not trying to provoke anything other than a discussion here. It would seem (to me) that it would be better for "Z80 beginners" to wr…
... ;975674"][quote]Hand coded Z80 can usually run rings around ... best to produce the quickest Z80 possible, so they'll ... optimization really wants as many registers (or more precisely register names ... code and various other standard Z80 tricks can just accomplish ... -
My NEXT isn't responding to my new PS2 mouseI don't have any idea what to do or where to look for advice.
... system. "TBBLUE.FW" is the z80 code that is run when ... from sd card, write hardware registers to enable or disable hardware ... -
New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
... - Hardware type
Added Z80 Halt signal state support on ... /> -now it highlights which registers will be modified by the ... scripts
Fixed Z80 halt behavior and PC location ... gitches resizing some windows: AY Registers, Debug CPU, etc...
... -
Is it possible to make the Z80 execute a bizarre instruction?What happens when it gets an unrecognised instruction OP Code, I mean something following a #ED that isn't one of the undocumented instructions eithe…
... NOP), or it may affect registers, flags, memory, I/O or ... instruction.
Because the Z80 is normally always running at ... , you will not damage the Z80.
External hardware ... however can also stop the Z80. The Z80 has two pins that ... -
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"…
... C compiler to emit relocatable Z80 code for that... I think ... stack and pass them as registers instead. -
New release of ZEsarUXFound today by chance on: [url]https://github.com/chernandezba/zesarux/releases/tag/10.1-13122021[/url] [quote]ZEsarUX-10.1 Beta1 Pre-release che…
... tape setting
Added Z80 Halt signal state support on ... /> -Now it highlights which registers will be modified by the ... zoom
Fixed Z80 halt behavior and PC location ... glitches resizing some windows: AY Registers, Debug CPU, etc...
- ... -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
So this is Z80 macro equivalent of the C ... parameters). Obviously it trashes all registers (apart from the A register ... -
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... a previous instruction, including updating registers, continues up to tick 3 ... />
https://github.com/kosarev/z80/issues/42#issuecomment-1270611817 -
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... a previous instruction, including updating registers, continues up to tick 3 ... />
https://github.com/kosarev/z80/issues/42#issuecomment-1270611817[/quote ... -
Dos emulators / games & Win XPHaving just brought a new computer which comes with XP I am having difficulty running my usual spectrum emulator (Z80). When I run it, it runs in a D…
... running my usual spectrum emulator (Z80). When I run it, it ... -
Z80, TZX and TAP formatsHi again I?ve seen these three formats as the most common of all. The doubt is... Which is the best of them? What are the differences between them? …
Hi again
I?ve seen these three formats as the most common of all. The doubt is... Which is the best of them? What are the differences between them? Which should I take, if the three are available for the same game?
Thanks in advance again -
PocketClive bugHi... thought I would give all of you that downloaded PocketClive, the PocketPC spectrum emuator a small bug report! There is a bug that prevents …
... prevents you from seeing any .z80 files stored in the \Program ... .sna file and all your .z80 should appear as by magic ... -
Warajevo compilerThere is a problem by Warajevo Z80-compiler. I want to compile files with the possibility of record and load. I use an option / TAPE (/ TAPE!). Ever…
... is a problem by Warajevo Z80-compiler.
I want to ... -
Emulator compatibility with real SpectrumHi emulator programmers... Having spotted for the last 6 months that my iPAQ is still missing a Spectrum emulator I started typing last tuesday - an…
... is really simple (run the z80 for 69888 tstates, issue a ... z80 interrupt and update the display ( ... that I have converted a Z80 emulator found on the net ... -
Help with my first emulatorActually, when I say 'first' that's a bit of a lie - I used to own a mac and had Macspectacle which was dandy. Now, however I have a PC running Windo…
... emulator to use. I downloaded Z80 and that was a bit ... -
Joystick helphi...... I am trying to find a spectrum emulator that supports my Gamepad that i have plugged into my PC. Which is the best emulator for PC joystick/…
... ........i have tried r80 and z80 but (unless) i am doing ...
