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Zilog Z80 ManualI'm looking at the zilog manual at the moment. (A pdf one), whilst trying to implement a basic emu, just for learning. Are there known to be many e…
... )10110rrr is the opcode, but i've got opcode AF (XOR A ... -
Hard drive imagingThe IT technician at the school I work at is having problems with the software that we use to distribute hard drive images to multiple machines at th…
... whole network grinds to a halt.
Can anyone suggest ... -
my dodgy speccys.hi people, i was wondering if i could engage some opinions / thoughts / ideas of anyone, regarding my current "fixing up" of my speccys, since you s…
... tape player slows to a halt within a second or two ... -
R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... as there's a single HALT.
So my questions ... without the contended RAM the HALT would take place earlier, essentially ... -
Emulators on a ZX Spectrum sectionIsn't it time to mention the emulators ON the ZX Spectrum in a special session. I know of 4 emulators for the ZX Spectrum right now: 1) ZX81EMUL (h…
... /coding/corewars/corewartutor.pdf+redcode+opcode&hl=nl&gl ... -
Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
... ),hl
lp1:
halt ; Wait for screen refresh every ... -
128k Page FlippingOver on adverts, AOwen wrote the following: [quote=aowen]The trick, as I understand it, is to redraw the whole screen each time at #c000, but point…
... to wait for a refresh (HALT) until swapping screens, when is ... -
Displaying registersHi I'm currently writing a Spectrum emulator, bacically to learn and see if I can =) I would like to test my functions before I continue, is there an…
... run the ADD a,s opcode and se in what way ... -
Sam Revival Back Issue Bonanza!As a special offer throughout March, i'm giving 25% off back issues of Sam Revival magazine. So if you are looking to fill in gaps in your collection…
Question For The Emulator AuthorsWhy do $ED $44, $ED $4C, $ED $54, $ED $5C, $ED $64, $ED $6C, $ED $74, $ED $7C all disassemble to opcode NEG and $ED $45, $ED $55, $ED $5D, $ED $65, …
... , $ED $7C all disassemble to opcode NEG and $ED $45, $ED ... combinations should disassemble to each opcode?
Interesting stuff this ...Manic Miner port on Wiicade? Want to assemble a team?Oh, feel free to move this topic, forum gods. It IS development, but for Flash instead of the Spectrum. I'm a 15-year-old American with an obsessio…
... , scrolling slows games to a halt and there's a little ...My little first set of routines.Hi all, I just coded a little set of routines just to draw a screen on video mem and a fade out. I could have just copied the screen rendering rout…
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NextPass:
halt
halt
halt
halt ;just a delay (1 ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
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[B]wait[/B]
halt ;halt when all row is completed ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... /> [CODE]$8000 DI
$8001 HALT
$8002 EI
$8003 ... ]
Place breakpoints on the HALT and RET instructions. Set PC ... will now freeze at the HALT instruction because no interrupts are ... debugger is stuck on the HALT instruction. Press "step over". ...MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... of the DD/FD/CB opcode ranges, and may be of ...Oh the humanity, my beautiful den of thieves, and local pub, closed it's doors.My local pub. MY PUB. My wonderful, awful, piss soaked, blood stained den of eniquity..... the only place in town, where when I walk through the doo…
... a Friday night, the protaganists halt proceedings, to apologise profusely to ...RZX reference samplesJust wondering, is it ok that neither Spin nor Spectaculator can replay the RZX reference samples provided on the [URL="http://www.ramsoft.bbk.org/rz…
... seems to start with a HALT, might it be that RealSpectrum ...Undocumented DD opcodesHi, I'm emulating the DD-prefixed opcodes at the moment. What happens to an undocumented DD opcode - Phil's test suite doesn't test them. For insta…
... happens to an undocumented DD opcode - Phil's test suite doesn ...Need Help - VideoOK, I have finally (nearly) finished my Z80 core! It's been a flipping long slog but I have now emulated (almost) all commands including a lot of th…
... the undocumented ones EXCEPT the HALT, IN and OUT commands. My ...BASin Assembler suggestionsHi Dunny. According to your former request here goes a few suggestions. Been playing around with the Assembler and I'm glad I did. Quite nice indeed…
... ]
[*]A column displaying the opcode of each instruction as its ...IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…
New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... wait states and fetching an opcode, and at the equivalent of ..."This is a screensaver that do not save the screen"Which was a quote from the first release of SCREEN$ back in April 2001. Little did he know that, against the best judgement of myself and my peers, I…
... will likely grind to a halt with this one. But I ...Thinking ahead...Just mulling something over for the Project After The Spectranet (which seems to have become never-ending...) Would anyone (except for me, naturally…
... , IORQ, MREQ, M1, INT, NMI, HALT) writing the values of each ...Some ever noticed that +2A/+3 halts Z80 using WAIT?I mean: Anyone ever noticed that the +2A/+3 halts the Z80 using WAIT? All documentation I've read about contention state that the ULA halts the Z80 …
... mount ULA) uses WAIT to halt the CPU. I haven't ...Adjusting your code for screen refreshingOk, I'm aware that I should know it already after writing 5 Spectrum games in machine code but interrupts and screen refreshes were always my weaker …
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If I perform HALT command in machine code, the ... can do:
[B]HALT
Delay to wait from ...many scr files to tap fileguys, I know that threads like this have existed in the past, but i'm gonna try to get a video onto speccy. The +3e to be exact. figured i'd use full…
... loading. maybe throw a im2 halt in between each one and ...Question on copying screen bufferHi, Al my prevoius games were copying graphics directly to screen memory starting at 16384. Now I'm experimenting with screen buffer where I could d…
... from buffer to screen after HALT.
Am I doing ...
