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InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... ), the processor simply executes an RST 38 instruction if an interrupt is ... (0xff), coincidentally the opcode for RST 38, so the Z80 will jump ... executed; if there is a RST n on the data bus ... -
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[url="http://zx.pk.ru"]http://zx.pk.ru[/url] is a biggest Russian forum for Speccy (has 750 Registered Users & 30 000 Messages). It's live discussion about software, hardware (Russian clones), Emulation, latest releases on Speccy, and unique ... -
Rst #38This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode…
This, as far as I know, is the ROM procedure that does the keyboard check. (and, at the same time, is what's being executed by interrupt in IM 1 mode).
It seems to write the last pressed key's code into #5C08.
The problem is that ... -
joining lines of BASICDue to overwhelming demand - well, one demand - well, more of a suggestion, really - here's a routine to join together lines of BASIC. The vertical c…
... /> VECTOR: DEFW K48+2
RST $38 ;MASK_INT
DI
PUSH ... -
DIVIDE versus ZX128 ROMDivide interface use hardware mapping of extra memory on this fixed points in 48rom: #0000 - power-on/reset/rst0/software restart #0008 - syntax erro…
type in to learn about IM2I'm trying to mess around with learning about IM2 and I found a nice little article in Sinclair User September 1988, issue 78, Page 70-71 [url="https…
... /> ret
INT_ROUTINE:
rst $38
push AF
push ...ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
... starts at &38 (it's called by RST 38).
However you ...ZX48k terminal...Hello everybody, I thought someone might help me. I connect my good old ZX48k to my PC via serial (IF1) link, and I was trying to write a little term…
... at &38 because the Z80 performs an RST 38 when operating with ... .
The routine at &38 in the BASIC is actually ...Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
Set your RAMTOP as to allow enough room for IM2 vector table, AY data, AY player, IM2 routine. Set IM2 mode. IM2 rountine should RST 38 and call AY player then RET preserving the value of HL'.Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... IM2 mode. IM2 rountine should RST 38 and call AY player then ...Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... know ASM.
Also RST 38 is one byte compared to ... the IM2 setup
RST 38 ; BASIC IM1 routines
PUSH ...i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... .
(Actually it would RST 38 twice then return but that ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... ), the processor simply executes an RST 38 instruction if an interrupt is ... (0xff), coincidentally the opcode for RST 38, so the Z80 will jump ... executed; if there is a RST n on the data bus ... so it 7 for an RST instruction and the total is ...I would like to write emulatorHi guys, I'm new to this forum but I realise that you must get loads of posts from people asking "how do I write an emulator" so I'll try and be spe…
... &view=auto"]after a RST 38[B]H[/B][/url]? (Yes ...Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... /> [/quote]
RST are fast single-byte calls ... interrupts the CPU. The RST instructions are one byte ... on the Spectrum. RST 16 (print) and RST 48 (calculator) ... fact, I would use RST#38 as #0038 is the ... fetch from address #0038. RST#38 would be an o/ ...MEMPTR finally crackedThis post is mainly for emulator developers. As you may be well know there is a misterious internal register in Z80 CPU (MEMPTR) which value is set …
... 12 tacts (on Spectrum, when RST #38 is executing) instead of 13 ...The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... then call the BASIC interrupt (RST #38?).
I'm not sure ...Dead Spectrum diagnosis and desolderingI have two dead Spectrums - one I'm pretty sure is caused by bad memory, and the other - well, perhaps a bad ROM, perhaps a bad CPU (it gets halfway …
... by Z80 constantly executing #FF (RST #38 ) instruction. Your RAM will be ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... machine code instruction RST #38. Therefore it'll just execute RST #38 instructions, and ...Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... this way. 0xFF is the RST 38 instruction, so lacking ROM altogether ... , the CPU just executes RST 38 instructions. The vertical stripes are ...Question on Z80 R/W cycles.Snipped from the complete spectrum ROM disassembly: [CODE] Now the memory is checked. 11DA RAM-CHECK LD H,D Transfer the value…
... this way. 0xFF is the RST 38 instruction, so lacking ROM altogether ... , the CPU just executes RST 38 instructions. The vertical stripes are ... 0x0038, which itself holds an RST 38!Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... chip, you'll get 0xFF (RST #38 ) rather than 0x00 (NOP). The ... it on - it keeps executing RST #38, and the stack overwrites the ...Rom dumping a Mirage MicrodriverI need to dump the rom of my Mirage Microdriver for Zub and don't know what to do...any help?
... chip, you'll get 0xFF (RST #38 ) rather than 0x00 (NOP). The ... it on - it keeps executing RST #38, and the stack overwrites the ...Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... ). IM 1 by causes an RST#38 to happen every 50th of ...Dangerous Z80 Assembly CommandHave been reading Toni Bakers' "Mastering MC On Ya Speccy" book and came across the list of Z80 commands in the dictionary section. Page 102 "[b]IM…
... at the end of the RST 38 routine).
The routine ...IF2 Rom snapshot creationHi, is it possible convert a Speccy 16k snapshot to a Interface 2 Rom file? I've the original Ultimate Pssst, Cookie, Trans-am and Jetpac tapes and …
... this!
[/LIST]
RST 10 won't work with ... fact none of the RST routines (apart from RST 38 ) will work.
128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…
... machine.
$ff is RST $38, calling the interrupt routine over ...128K Guru requiredThe answer eludeth me, and I seeketh a higher knowledge! I'm in the process of putting together a very simplistic emulation testbench of my laptop s…
... machine.
$ff is RST $38, calling the interrupt routine over ...
