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writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... you mean. If every interrupt service routine enabled interrupts ... interrupts in interrupt handlers. If we start interrupt handlers with ... decide to enable an "interrupt within interrupt". If we do ... z80 only has one maskable interrupt so any interrupting device ... -
Disable interrupts?Well, I've read the bits from the David Webb book about interrupt modes and (vaguely) appreciate the principles behind having a vector table, after r…
... last...I wrote my first non ROM interrupt routine last night-I ... -
Disable interrupts?Well, I've read the bits from the David Webb book about interrupt modes and (vaguely) appreciate the principles behind having a vector table, after r…
... last...I wrote my first non ROM interrupt routine last night-I ... -
Simple explanation of interrupts (in the context of Z80/Speccy)I wondered if somebody on here could explain in simple terms how interrupts work on the Speccy and where interrupts are source from. Are they a natur…
I'd recommend reading the 'INTERRUPT RESPONSE Overview' section of the ... User Manual.
The maskable interrupt is generated by an external ... possible to program when the interrupt occurs to coincide with a ... -
recovering the stack after an errorMy normal error handler starts with the stack as reset by LD SP,(ERR_SP) in $0053 ERROR_2, sets up some stuff and returns to BASIC via a "JP C,$1e73 …
... the several PUSHes in the maskable interrupt routine). -
Treasure Island Dizzy 128k +2a modeHi all! I have a original black spectrum 128k +2a computer in my collection and quite a few games and im a big big fan of codemasters and the Dizzy …
... gets paged out by the maskable interrupt call to the DMTR. Normally ... -
ZX MYSTERY INTERFACEAnyone knows what is this? [url]https://www.facebook.com/photo.php?fbid=471603846230444&set=oa.485131374856902&type=1&theater[/url]
... was either for NMI's (non maskable interupts) or reset :) -
horace and the spiders loading error ?[url]http://www.worldofspectrum.org/infoseekid.cgi?id=0002350[/url] the tap , "horace2" seems to crash in 48k mode, but works in 128k +2 mode in sp…
... , does another JP. If a maskable interrupt occurs between the two JPs ... -
Windows emus on LinuxYesterday I tested my new Fuduntu Linux distribution and of course my favorite windows emulators. I was really pleasantly surprised at how well they …
... is very simple to select maskable interrupt frequency of TK90X (50 or ... -
Windows emus on LinuxYesterday I tested my new Fuduntu Linux distribution and of course my favorite windows emulators. I was really pleasantly surprised at how well they …
... is very simple to select maskable interrupt frequency of TK90X (50 or ... -
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... -do-tk90x.html]measured[/url] maskable interrupt frequency of my TK90X.
Brazilian TK90X and TK95SpecEmu provides explicit support for Brazilian TK90X. Other emulators provide indirect support (perhaps the "Spectrum 48K NTSC" option in Fuse?). Al…
... -do-tk90x.html]measured[/url] maskable interrupt frequency of my TK90X.[/QUOTE ...What would be the simplest tape loading routine?I'm searching for some small assembly snippet I can use to load a (headerless or not) block from tape into RAM I can embed in my C games to load furt…
SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... /> pause_1:
halt ; wait for maskable interrupt
dec bc ; reduce counter ...Mountains of Ket - Written in Basic?Was Mountains of Ket written in Basic? And if so is there any way to break into it? The parser's pretty impressive, I want to see how it was done.
... to continue with the normal maskable interrupt routine.
Replace with "POP ...A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... 't use IY, but the maskable interrupt does, so I would draw ... sentence on page 222. The maskable interrupt uses IY to update FRAMES ...A "generic" loader for +3(e)I've made this loader for 128k games in +3DOS. [CODE]dos_open equ 262 dos_close equ 265 dos_abandon equ 268 dos_read equ 274 dos_write equ 277 dos_s…
... 't use IY, but the maskable interrupt does, so I would draw ... sentence on page 222. The maskable interrupt uses IY to update FRAMES ...Clear command in z80Hi, How would I replicate what the basic clear command does in z80? Do I need to change the stack pointer as well as setting ramtop (23730)? If I se…
Yes, resetting that bit stops the 48k ROM being paged out by the maskable interrupt.doom on 128ki see a youtube video of doom being played for the spectrum, is this designed to work stright of a tape and onto a spectrum without the divide thing …
... routine being called by the maskable interrupt, and if I've put ... swapped it out then the interrupt routine swaps in a mostly ...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…
... /> [QUOTE]The enable interrupt instruction sets both interrupt enable flip flops (IFFI ... 1, allowing recognition of any maskable interrupt. Note
that during the ... and the following instruction,
maskable interrupts are disabled.[/QUOTE]
Opus DiscoveryWould anyone have any materials about programming the Opus Discovery disk? I know it overrides ROM and uses microdrive commands, but I am more into b…
... floppy controller, is done by Non Maskable Interrupts and the JP (HL ...New game: SolarGun 1.0[img]https://dl.dropboxusercontent.com/u/75238938/solargun4.png[/img] [img]https://dl.dropboxusercontent.com/u/75238938/solargun5.gif[/img] (that g…
... enable interrupts inside the interrupt handler routine. So ... Section "Interrupt Response"
sub-section "Interrupt Enable/Disable"< ... the CPU accepts a maskable interrupt, both IFF1 and ... will lockup forever, since interrupt handler never enabled interrupts ...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…
... , waiting for a vertical blank (maskable interrupt) in order to update sprites ... updates are down on the interrupt. The interrupt provides a "reset" time ...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…
... last line of your interrupt service routine so you ... JP MASKINT ; Jump to ROM maskable interrupt routine at $0038
... />
As your interrupt service routine does nothing, it ... JP MASKINT ; Jump to ROM maskable interrupt routine at $0038
...
