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Game loopJust working on my first ever Spectrum game, and am struggling to work out what the game-loop should look like. I've got interrupts enabled (mode 2)…
... not doing anything in the interrupt routine at the moment.
loop: halt ; wait for interrupt to occur
clear_sprites
Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
... br /> di
;Interrupt vector table to go at ... />
;Copy main interrupt handler into place:
ld ... />
;Main multicolour interrupt
;--------------------------
multicolour_interrupt_A
...48k AudioI'm at the point in my game where I could use a few beeps and bloops. Ive been looking at loads of different speccy books, but this whole business of…
... , but this whole business of interrupt driven audio is proving to ...Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... [I]before[/I] the interrupt is acknowledged, and that the ... the return address of the interrupt handler. Firstly, if the ... seem simpler in the interrupt acknowledgement not to deal ...
For NMI and maskable interrupt acknowledgement, it contains:
Making AY musicCan anyone recommend an AY music making package that is as user friendly as Beepola is for the speccy beeper? And do they make their own interrupt r…
... do they make their own interrupt routine/is it easy to ...New version Emulator ZEsarUX-1.0Hi I have uploaded a new version of my Spectrum/ZX80/ZX81 emulator. This is a major stable version, with real timing for all the models and with hi-…
... in border, colour ula delay, interrupt starts at video display (not ...Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... instructions there is also NMI interrupt which /when triggered/ jumps to ...MIA: Airline SoftwareAs discussed in another thread, I was recently reunited with a box containing most (not all) of my original cassettes. Thanks to the advice and help …
... /> 07. Hex Package
08. Interrupt Driven Clock
09. Message ...Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... ).
It could be interrupt related, how do interrupts occur ...HALT: Why always 4ts?Instruction breakdown of halt is like that: PC 4ts. That means it fetches instruction byte from ram which tooks 4 ts and then does nothing and read…
... again until a reset or interrupt.
if halt is ... 4 ts to handle the interrupt?
I mean if ... at cycle 5, and if interrupt triggered at cycle 6, cpu ... will not jump to interrupt until cycle 9.
Playing AY music on the SpeccyCan anyone help with playing AY ripped music on the Speccy? So, let's say I want to play some ripped AY music, such as: [url]ftp://ftp.worldofspect…
Problems with AY sound. Experts needed. :-)<div><span style="font-family: Arial, Verdana; font-size: 13.3333330154419px; line-height: normal;">I need to play some AY sound effects, so I've bee…
... some changes to not use interrupt or have self-modifying code ...Odd joystick interface / startup behaviourI was experimenting with setting up a machine to run [i]Bomb Munchies[/i] at the weekend and was surprised by a particular condition that caused my +…
... , or OUT commands or odd interrupt states that may trigger a ...Emulator support to paste textIs there any emulator that supports pasting text ? Something like: - for every ZX frame (just after interrupt) "insert" a new char (force keybo…
... every ZX frame (just after interrupt) "insert" a new char (force ...z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... /> delay0 halt ; wait for an interrupt.
djnz delay0 ; loop.
ZX Uno programming competition[b]Rules[/b] - The game tematic is free. The languaje can be english or spanish. - You must use Radastan video mode in the game as principal. - …
... /> - Mix video modes (using raster interrupt). Example: Text adventure with graphics ...Which peripheral listened on port $9f from back in 1984 (Chuckie Egg related)Hi Apologies if this is in the wrong section, please feel free to move it to the correct one if so. I've been looking through the Chuckie Egg c…
... in the middle of the interrupt service routine (ISR) and was ...Reading sequential key pressesI am thinking about writing a quick game and have an idea that requires me to read alternate key presses. I’m thinking along the lines of Daley Thomp…
... for key presses on every interrupt? Anyone got any views on ...Fuse 1.2.1 releaseA new release of Fuse, the Free Unix Spectrum Emulator, is now available at the SourceForge project: [url="https://sourceforge.net/projects/fuse-e…
... to the ULA, tstates since interrupt and the primary and secondary ...Fuse for Mac OS X 1.2.1 ReleasedA new version of Fuse for Mac OS X has been released at the dedicated sourceforge project: [url="http://sourceforge.net/projects/fuse-for-macosx/"…
... to the ULA, tstates since interrupt and the primary and secondary ...AY Sound Effects from WAVI'm wondering if someone has crossed this bridge already. There are a bunch of sampled sound effects in wav form that need converting to the AY ch…
... that approximates sampled speech using interrupt driven AY audio. That's ...Contended memory article on WikipediaYeah, apparently there's one. https://en.m.wikipedia.org/wiki/ZX_Spectrum_Contended_Memory [quote] However, the ULA must wait for a Z80 read or wr…
... the display on interrupt, as the Spectrum maskable interrupt was generated by ...In-game AY music and sound effectsI'm currently working on various aspects of a Spectrum game and thinking now about the sound side of things. I know you can use a utility like Vortex…
... played in-game via an interrupt routine. I'm thinking about ...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/…
... . This contained an extremely hairy interrupt routine that replaced the ZX81 ...How to be a hero - bugfixBug #1: Sometimes the game has frozen at the end of level (can see in RZX of the 3rd level by malcolm) Reason: The scrolling text works with…
... with buffered technology in the interrupt procedure (IM 2). If the ... interrupt occurs in a very unlucky ...Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... byte.
im 2 ; Select interrupt mode 2.
ei ; enable ... /> org 65024
; pointers To interrupt routine.
defb 200
New language for spectrumI made a halfway language between assembly and Basic here is some example code: [code] INFLOOPSTART ifram(scrolla=1) print(intera) endif…
... />
This code creates an interrupt service routine which runs at ...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…
... still doesn't cover the interrupt handling, which would be MCPs ... problem. All the interrupt handler would have to do ...Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... code is simply an IM2 interrupt that checks to see whether ...
