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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 …
actually, in 48k basic interrupts stays disabled. but in 128k routine at #5B01 (which does ROM swapping) contains DI followed by EI. this is the cause of your problems with mysterious interrupt re-enabling. -
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 …
... routine was taking too much time & space. Although the initial interrupt ... entry on the stack, an interrupt could occur at any time ... FN (...)=USR ... to call the routine, looking for other ways of ... -
IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
... emulated spectrum, be that the interrupt service routine, ZX BASIC, various ROM ... -
IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
... emulated spectrum, be that the interrupt service routine, ZX BASIC, various ROM ... -
IX register woes - or is SPIN buggy?Or am I missing something? I'm trying to use the IX reg to acess a table containing an x and y coord. My code below just doesnt seem to work proper…
... emulated spectrum, be that the interrupt service routine, ZX BASIC, various ROM ... -
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 …
... is the disk motor timeout routine. At the start Dizzy is ... paged out by the maskable interrupt call to the DMTR. Normally ... it whether to call that routine or not, and the POKE ... -
Converting games to disk: difficult loadersThis thread has an spanish version in foro speccy, but I haven't gathered enough information to overcome my problems. I've been converting some game…
... it triggers usually in the routine that puts data into paged ... location of SP and the interrupt status at that moment.
Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…
... of the screen. From the interrupt occurring at the top of ... processor move on to other routine stuff like animating sprites. So ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... start address of a USR routine, start with:
HALT : DEC ... Spectrum by starting the USR routine with:
PUSH BC : POP ... /> this latter option being also interrupt independent. Either way, the program ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
and an IM2 routine has to have the vector table at a known point in memory... somehow you have got to CALL or interrupt and then return as they are the only way to get PC onto the stack.Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... only situation in which an interrupt would cause it to fail ... using one of those simple interrupt routines to update a digital ... load and run your proposed routine, it may crash.Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... using one of those simple interrupt routines to update a digital ... load and run your proposed routine, it may crash.[/QUOTE]
Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... only situation in which an interrupt would cause it to fail ... why an ISR or NMI routine [I]would[/I] do this ... ]
Oh also your routine will fail if you pull ...Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... why an ISR or NMI routine [I]would[/I] do this ... case heh][/QUOTE]
Interrupt routines that draw sprites are ...Accidental rainbow effects.. How do I adapt?I've somehow bizzarrely created a rainbow text effect on my title screen by accident. The title was just supposed to flash different colours whilst …
... disabled during your IN keyread routine. This is because when EI ... seperate keyread to your IN routine). But you need to being ... needed first.
The routine below will ~work on a ...
di ;when EI the interrupt keyread takes different amount of ...Mouse systems for ZX Spectrum[U][B]Mouse systems for ZX Spectrum[/B][/U] Okay, I have been reading the [URL="http://www.worldofspectrum.org/forums/showthread.php?p=688449#post68…
... driver.
AMX MOUSE make interrupt for CPU, driver must run ... run as small and fast routine under interrupt.
K-MOUSE drivers ...Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... about data bus stability during interrupt ? Z80CPU need stable vector value ... data bus and during IM2 interrupt CPU read different vector than ... read different adress of IM2 routine and program crash...
Interface 1 bisOk, well the postmans just been and brought with him my new arrival, the Interface 1 bis. So as promised I thought I'd share some initial usage exper…
... about data bus stability during interrupt ? Z80CPU need stable vector value ... data bus and during IM2 interrupt CPU read different vector than ... read different adress of IM2 routine and program crash...
Thinking of modding an Atari paddle controller for games like Arkanoid...Hello, Was thinking of trying out a controller mod using an Atari 2600 paddle controller to use with games like arkanoid, Batty, etc... The paddle c…
... /existing games :)
The routine that does the important thing ... :
[code]
;Called at interrupt time (for example). Uses Kempston ...DIVIDE PLUS - new memory mode DIVIDE128Divide PLUS contain 512kB sram + 512kB flash eprom. Memory paging in this device is enable on two different ports : 1) port #E3 is compatible with o…
New routine for install 8kB rom image ...
OUT (23),A ;disable interrupt,disable MB02 memory,set divide ... ]
Before start this routine must be loaded 8kB ROM ... support DIVIDE128 paging mode. This routine can be used also for ...Where do you stick the stack?...OK, so I've got a fair chunk of ASM code assembled from 24000 mark. The stack shouldn't get very big, just a few PUSHes and POPs of the main regis…
... 't need a 256 byte interrupt table as the low byte ... of the interrupt address is always $FF.
interrupt service routine pointer as this is somewhere ...
