-
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…
... in ULA) + z80 registers and Interrupt mode & Status (Stored in ... per game (your registers and non-ram data per game).
Graphics program in AssemblyHi so I think I'm getting the hang of this so I've done this program. It writes directly to the screen. I'm using ZX Spin. [code] LD HL,16384 LD B,…
... />
But it's what interrupt routines do, so they can ... for the fact that an interrupt routine might temporarily halt your ... the 8 flag bits (the non-zero, calculation overflow, carry etc ...Control methods to support in new game (kempston, sinclair, redefinable keys etc)Hi guys, I've been busy lately working on porting a game from the C64 to the Spectrum, and I'm at the point where the main game is working pretty …
... the CPU until the ULA interrupt, then reads the port during ... for people to play on non-original keyboards (PC emulators, clones ...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…
... writes, io reads, io writes, interrupt acknowledge, nmi acknowledge, halt, bus ... 0 so you have a non-volatile program ready for reading ...128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…
... , 4 and 6 (plus the non-video portion of bank 7 ... still doesn't cover the interrupt handling, which would be MCPs ... problem. All the interrupt handler would have to do ... .[/quote]
The problems with Interrupt handling on the 128K and ...128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…
... you have a typical IM2 interrupt routine with an AY music ... from the beginning of the interrupt till the raster reaches the ... inside the CALLed routines. Various non-critical parts such as menu ...Key repeat weirdness with EI & IYI finally (after 35 years!) decided to write something a) for 48k speccy b) in z80 assembler. It's been over 20 years since I've written anything in …
... a CPU reset, or an interrupt (any). So as there are ... the CPU to ignore the maskable interrupts (INT, as generated by ...Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …
... manual) or disable BASIC's interrupt handler entirely (which you will ... , as they're on a non-bankable page (unless you all ...Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... , maybe, #C9 appears on a non-first iteration of the test ... the RET instruction of the interrupt handler located at #7F7F. And ...The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... $c000. If it’s a non-contended bank, then the same ... to run without crashing, the interrupt vector table and the JP ...The I register pointing to $40–$7f causes ULA snow and a crash. Or does it?I have heard it from numerous sources, including a few members of this forum, that 128K/+2 machines crash if the I register points to a range of $40–…
... /> Copied the ISR and the interrupt vector table in all RAM ... banks but kept the interrupt vector table in non-contended memory, then ... locations, i.e. contended/non-contended. The snow-effect pattern ... not just by setting the interrupt register to $40–7f but ...Spectrum games that are both 48k and 128k but where the 128k version is infinitely superior The only one I can think of is "Rock Star Ate My Hamster" but there must be others . So where are the games where the 128 version is great but wher…
... normally intended to be played non-stop from start to finish ... .
Yes, it will interrupt the flow... but having the ...IM2 on a 128k SpectrumHello: I have found another article on IM2 found in Personal Computer News, Issue 90. In the article "Face up to the Time", I typed up the code (…
... in at the time the interrupt occurs.
This isn ... bus) can theoretically also generate maskable interrupts, and you’re not ...Whats the smallest amount of time to precise emulate a Spectrum?Whats the smallest amount of time to completely emulate a Spectrum? Maybe the ULAs timings as mentioned here: [url="https://opencores.org/projects…
... ~2.5 cycles starts at non deterministic points because the Z80 ... was the state of the interrupt line a cycle ago", of ...XYZ - a multithreaded GUI operating system for SpeccyToday I'm re-starting my unfinished project. A few years ago I wrote the yx multitasking kernel (which includes RAM/ROM versions, threads, memory man…
... in both directions every IM2 interrupt at 115.200 bauds. It ... it reads or writes to non-paged address or needs relocation ... having one compatible 50Hz VBL interrupt). Will report how it goes ...New (latest) Version of #CSpect: SpecNext Emulator for Windows, Linux and OSX by Mike DaillyNew latest Version of #CSpect: SpecNext Emulator for Windows, Linux and OSX by Mike Dailly V2.15.2 As seen on Facebook yesterday: [quote]Mike D…
... the copper plugin). Even for non-devs, this is a funky ... file
Fixed a raster interrupt issue
Added -copwait command ...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…
...
cls:
di ;disable interrupt
ld (.stack+1), sp ... ;) I'll probably implement collectible non-moving objects (key, jewel) first ...XYZ - a multithreaded GUI operating system for SpeccyToday I'm re-starting my unfinished project. A few years ago I wrote the yx multitasking kernel (which includes RAM/ROM versions, threads, memory man…
... T states have passed since interrupt. As with the 48K machine ... frame, and the '50 Hz' interrupt occurs at 50.01 Hz ... routine has to be in non contended memory as well 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…
... 69888 tstates, issue a z80 interrupt and update the display (I ...Currah MicroSourceThis is an interesting one for the experts to mull over. I've got (and love) a MicroSource interface from Currah which consisted of an 8K ROM provid…
... /> I tried setting up an Interrupt 2 but MicroSource disables interrupts ...MIS2 Project Comming Soon ;-)Hi folks, As you might be aware by now, I've been working hard with Steve Brown to get as many perfect TZXs onto The .TZX Vault. In 2002 I'm going …
... MIS project to include any non perfect images that are on ...machine code basicsWondered if anyone can help me out. I have been playing round with some disassemblers (Zeus). And Machine code loaders. All I want to do is print my…
... out.
In other non- z80 examples there are ways ...Certain Games Wanted - Very Good Prices PaidHi I have been after a few games now for ages and have turned to this forum as the last resort, can you help? I will pay ?5.00 for each of the follo…
... good condition and original releases (non budget), also it would be ...SPIN Update 0.1a (beta) availableHi all, The latest beta of SPIN is up (a new ZXSpectrum emulator, in case you've not heard of it before - it's not bad, IMHO :), and available fo…
SPIN Public Beta 0.1b Available for downloadHi all, back again, and as just recently announced on CSS, SPIN has been updated. Here's the post to CSS (or the relevant parts): It's been a bu…
... works for the most
non-copyprotected disks. That's being ...ANNOUCE: Spin Public Beta 0.1d now availableWell, after the overwhelming response to the previous announcement here on WOS Forums, I thought I'd best post that SPIN 0.1d is up. Here's the CSS …
... the TZX loader.
Known non-working CSWs (From Andy Barker ... Standard *TZX* blocks - CSWs and non $10 blocks won't
Multiface pokes just for you...Hi :) Way back when I was a young 'un I used to be banging away at my Multiface with Genie non-stop. Oh joy :) Made a packet advertising in YS selli…
... at my Multiface with Genie non-stop. Oh joy :) Made a ...
