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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…
... . If every interrupt service routine enabled interrupts directly ... after EI, then another, higher priority interrupt ... enable an "interrupt within interrupt". If we ... enabling interrupts within interrupt service routines? They ... -
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 directly after EI ... device to try to interrupt its own ISR routine whether that be ... once or a regular interrupt's service routine takes longer than expected ... -
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…
[QUOTE]
It's very easy to write to ROM - I can do it right now, with (as you stated) a simple LD (HL),n opcode with HL set to -
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…
... instruction immediately after return from interrupt handling routine, should it be executed ... -
Z80 sound enginesI'm looking for a decent sound engine to use in a Z80 program I'm writing, but I've no idea which is the best/fastest/easiest to use. I could do wit…
... least amount of time every interrupt.
I tried Romford from ... it uses the beeper ROM routine.
So, any ideas ... -
Z80 sound enginesI'm looking for a decent sound engine to use in a Z80 program I'm writing, but I've no idea which is the best/fastest/easiest to use. I could do wit…
... routine to manage the timing. The less time you allocate each interrupt ... precise, so for a beeper routine you could just feed 0s ... -
Z80 sound enginesI'm looking for a decent sound engine to use in a Z80 program I'm writing, but I've no idea which is the best/fastest/easiest to use. I could do wit…
... routine to manage the timing. The less time you allocate each interrupt ... precise, so for a beeper routine you could just feed 0s ... re-fill the buffer each interrupt.[/QUOTE]
Yes, I ... -
IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…
... "? Unless there's a sub-routine of SCANNING which can be ... , unless it's possible to interrupt the expression evaluation while the ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... the timing of your IM2 routine has just changed massively.[/QUOTE ...
OUT Linecounterport,128 = do interrupt after 128 lines was passed ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
[QUOTE=Philip Kendall;574230]Because the timing of your IM2 routine has just changed massively.[/QUOTE]
I understand. For some reason I keep forgetting that in reality there's just one interrupt used for everything. I stand corrected. -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... the timing of your IM2 routine has just changed massively.[/QUOTE ... 'd only enable your (programmable?) interrupt if you actually wanted it ... written to understand an extra interrupt wouldn't enable it, so ... -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... interrupt.. like being able to define on which scanline the 50Hz IM1 ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... . You have to get the interrupt to trigger at exactly the ... it.
When the interrupt occurs, it has to wait ... T-State delay before your routine begins. You can factor it ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... . You have to get the interrupt to trigger at exactly the ... it.
When the interrupt occurs, it has to wait ... T-State delay before your routine begins. You can factor it ... -
converting ZX128 software for SAM COUPESAM COUPE is computer compatible with ZX48 model. Use same ports, same keyboard with compatible membrane, 64kB adress space with possibility connect …
... . I add to interrupt code easy slow-down routine and speed is ... -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... />
switch_off:
di ; restore IM1 mode
im 1
jp 56 ; exit via BASIC interrupt handler
blit: ; subroutine ... /> jp im_main ; jump to main interrupt handler
org 0xfff7 ... -
Willy Meets The BeatlesHere's the almost complete release of Willy Meets The Beatles, which you can download from [URL="http://www.sendspace.com/file/55ps31"]HERE![/URL] T…
[QUOTE=gasman;596430]The player routine is 1084 bytes long and ... and setting up an IM2 interrupt handler. The title tune, provided ... -
Which Speccy game had best border effectsIn truth, I'm just trying to remember a game from my youth, and the amazing border effect during pause is the only thing I can clearly recall about i…
... . You have to get the interrupt to trigger at exactly the ... it.
When the interrupt occurs, it has to wait ... cycle accuracy. See the CODETIME routine in my [URL="http://zxds ... routine to wait the necessary amount of cycles to make the interrupt ... -
Precisely timed loops in assemblyI'm looking for a way to make my code stop until the raster has reached the lower screen border (right after having drawn the last pixel line). I und…
... learn in there, like the routine for waiting exactly the specified ... aligning your code with the interrupt precisely. Combined with the timing ... -
A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
... worry about writing a sprite routine, a joystick handler and you ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... to provide a quick erase routine like [I]Buzzsaw+[/I] uses ... four sprites before the next interrupt occurs, but it'd be ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... /> [*] Re-implement the tile rendering routine in a way that Assembly ... to provide a quick erase routine like [I]Buzzsaw+[/I] uses ... four sprites before the next interrupt occurs, but it'd be ... " section when I release the routine to render tiles directly.
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... can jump to your own routine, do whatever you want, ... instead to any music player routine of your choice, and it ... calling it directly from the interrupt vector, since BIFROST* synchronizes ... raster beam to eliminate all interrupt delays). I will keep in ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... next, comes after the colour routine, when precise timing doesn't ... at the beginning of the interrupt to draw/animate tiles, and ... />
Although using this initial interrupt period for other tasks could ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... a call to the colour routine[/QUOTE]
Sure, that ... parts were executed inside the interrupt, there would be no practical ...Maritrini and Cray 5 loading problemsHas anyone else here had issues loading either of these on a 128k? No matter what I try, both these games refuse to load properly. I can get both t…
... interrupted by the vertical retrace interrupt in the middle of your ... , and the interrupt handler might call a G+DOS routine to perform ... .
So, the "REUBICA" routine should be changed to something ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... 'm studying how to implement INTERRUPT routines.
You can set ... + 256, can you place your routine in the 32768 RAM address ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... 'm studying how to implement INTERRUPT routines.[/QUOTE]
Even ... ZX BASIC provides its own interrupt mechanism, programs using BIFROST* would ... + 256, can you place your routine in the 32768 RAM address ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... ZX BASIC provides its own interrupt mechanism, programs using BIFROST* would ... out you can place your routine at 32768 or near that ...A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... specific memory address because the interrupt vector is location dependent, thus ... . Though if you make your interrupt vector a tiny bit of ... before you get to your routine.
There is a ... I glued in an IM2 routine completely compiled in ZX Basic ...
