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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…
Instruction breakdown of halt is like that:
... again until a reset or interrupt.
if halt is already ... and again to execute the HALT, why it still takes 4 ... /> I mean if cpu executed HALT at cycle 5, and if ... -
Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
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MainLoop:
HALT ; Wait for VSYNC Refresh
LD (IX+2),0 ; Reset x offset to 0
Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... /> LD A,0
MLOOP HALT
LD (SCRPOS),A ;SCROLL ...
LD A,E ;reset the horizontal screen
AND ...What happens during a reset?I always used to wonder about this, but only thought a bit more about it last night when noticing after all these years what actually happens. Obvio…
... what is happening during a reset: the entire RAM is set ... from address 65535 downwards, then reset to 0 upwards from 16384 ...my dodgy speccys.hi people, i was wondering if i could engage some opinions / thoughts / ideas of anyone, regarding my current "fixing up" of my speccys, since you s…
... the audio output externally, and reset the machine with the break ... tape player slows to a halt within a second or two ...R Register, Contended RAM and ClonesHi. I've had a quick look at the CSS FAQ but didn't spot quite what I'm looking for (also the CSS FAQ doesn't have much detail of the clones - there …
... register. At one point I reset it, and at several points ... as there's a single HALT.
So my questions ... without the contended RAM the HALT would take place earlier, essentially ...Pixel Explosion CodeJust a little snippet to cause explosive effects. It uses table lookups for the screen address, and can handle up to 32 pixel particles. A particle…
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lp1:
halt ; Wait for screen refresh every ... br /> ld (ix+4),0 ; reset counter
; Increase ... br /> ; 5 X Direction Reset Point
; 6 ...Spectrum ResetHi All I have asked this before but in another thread as part of something else. I really cannot recall all this stuff from way back :[ When I ha…
... what is the process to reset the
Spectrum other than ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
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[B]wait[/B]
halt ;halt when all row is completed ... )
ld e,8 ;reset e, number of rows in ... [/B]
ld c,8 ;reset c, number of side movements ...About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …
... would like to add a reset button in the same manner ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
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Place breakpoints on the HALT and RET instructions. Set PC ... will now freeze at the HALT instruction because no interrupts are ... debugger is stuck on the HALT instruction. Press "step over". It ... Okay. The machine should now reset itself. Now go back to ...Spectrum + Reset SwitchI've picked up a Spectrum + that doesn't have a reset switch fitted. Any recommendations / part number for a modern alternative? Cheers
I've picked up a Spectrum + that doesn't have a reset switch fitted.
Any recommendations / part number for a modern alternative?
CheersScreen display at resetJust something for curiosity: When the Spectrum is reseted by for example NEW a very typical screen is shortly displayed. [IMG]http://i33.tinypic.c…
... some temporary "malfunction" during the reset that makes this happen?Composite video and reset buttonOK, I've got some Kempston clone interface here, and I've added a phono socket and a small momentary switch to it (ages ago but forgot about it) . :)…
... connector
Wire reset to reset signal on edge connector.
reset, is it just the what ... I'd guess (reset pin on one side of ...Defenda (Interstella) makes resetDefenda from Interstella makes a reset if I take No. 1 Kempston joystick. My jockstick interface is from Ram Electronics (Fleet) Ltd. Joystick is a C…
Defenda from Interstella makes a reset if I take No. 1 ...Which reset method on ZX 48K?What reset method is correct on issue 3b ZX 48K: One wire to R68 and one to C27 (Manual from ZX Spectrum +) or One wire to Pin 26 from CPU and one …
What reset method is correct on issue 3b ZX 48K:
One wire to R68 and one to C27 (Manual from ZX Spectrum +) or
One wire to Pin 26 from CPU and one to GND
MickyBEEPER music compo 10-11 July on Di:Halt partyoh yeah! public pressure organizers [B]Di:Halt [/B]which will take place [B]July 10-11[/B], agreed to hold the [B]beeper music compo[/B]. The rules…
... ! public pressure organizers [B]Di:Halt [/B]which will take place ...Help?Hi All, I wonder if anyone has a few minutes to look at this bit of code I'm working on. I'm trying to move to sprites and want to do it with a scr…
... times
ld hl,bits ;reset bits (lines of character for ... address
inc (hl)
halt ;just so I can see ... what's going on.
halt
ret
sprite ld ...Adding a reset switch to a 48K?I've done this before but can't for the life of me remember which line to pull to ground! I tried /NMI which does reset the machine when it's in bas…
... /> I tried /NMI which does reset the machine when it's ... running. Would it be the /RESET line?
TIANew joystick interfaces with through-port and resetShall I make some or not? Something like: [IMG]http://benophetinternet.nl/hobby/vanmezelf/kemp_joy.jpg[/IMG] Specs: - Small flat board with throug…
Bad Reset Line on +3eHello there my fellow WoS'ers, Alas I have not been about much over the last couple of weeks, got hit by the flu, headcold and a rather nasty throa…
... Spectrum +3 with a Bad Reset line - Its that bad even ... the reset button doesn't work... Unfortunately ...Intermittent reset on 48K (issue 4S)I'be been fighting an intermittent selfreset the whole day. Changed ULA - did not help. Tested TR6 as i could and compared the reading with another…
... and either get a self reset (most likelly) or a freeze ...High Score ASCII array reset ?Hey guys, Noob alert! I'm working on my first game and I'm having problems with the high score on the second time through the game loop. My high …
... , the high score does not reset.
I wrote a ... this, but it doesn't reset the ASCII values back to ...reset for 48k via edge connectorHi, I really want to wire up a reset button for my 48k, i know how to do this internally, as per the spectrum+ upgrade. But I'd prefer to do it via …
... want to wire up a reset button for my 48k, ... connector that was just a reset button. I'd like ... could just solder a reset switch between 20b and ... :
[I]20B RESET momentarily connecting this line to ... (video ground 14b) will reset the machine just as if ...Is there an SNA halt bug?Hello all, I noticed that some SNAs don't work on my emulator but they do work in almost everyone else's, SPUD fails with them too which is a tad sp…
... to get stuck on the halt instruction. I can't find ... with regard to SNA and halt, does anyone have the details ...Reset button on a 48k rubberI managed it once but it wasnt pretty, had a + reset switch sticking out the side by the power in, anchored by the screw post and dremelled out a gap…
... it wasnt pretty, had a + reset switch sticking out the side ...Border colour on resetI have noticed a strange (and somewhat disquieting) glitch or feature on the ZX Spectrum. Sometimes, when the Reset button is pressed on the later m…
... .
Sometimes, when the Reset button is pressed on the ...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…
... address bus during execution of HALT, beyond the initial M1 ... contains the following code for HALT:
[CODE] case ... the opcode fetch after a HALT could actually trigger paging ... of addresses well before the HALT operation finishes. While I ...white sticker next to reset on +128kjust noticed this while putting it away its a small rounded white sticker with number 3300 on it and its stuck on right next to the reset switch.th…
just noticed this while putting it away its a small rounded white sticker with
number 3300 on it and its stuck on right next to the reset switch.this wouldnt be a unit number in the production run would it?
:wink:Top Telly Tip... Halt and Catch FireThe series is set in the early 1980s and depicts a fictionalized insider's view of the personal computer revolution. The show's title refers to the f…
... the fictitious machine code instruction Halt and Catch Fire, which would ...
