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My attempt to restore the CPU clock signalI know Winston has already got this, but I can't see any thread with details about it. Only wanted to share my (still early) results. I'm not taking…
... reshaping the ugly shaped clock signal available from the rear ... do is a module that could give me a ininterrupted clock signal ... />
From this restored clock signal, it's easier to syntesize ... respect to the clock input signal.
[code]module ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... Z80 will sample the /INT pin. If /INT is low and the ... after EI. Another point I would make is that the /INT signal must ... as the ULA pulled /INT low, the EI will finish 23 tstates ... peripherals, most notably the Multiface, do use NMIs successfully.
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... will sample the /INT pin. If /INT is low and the ... the ULA has pulled /INT high again. For example, ... the ULA pulled /INT low, the EI will finish 23 tstates ... finish 27 tstates after /INT went low, and another ... most notably the Multiface, do use NMIs successfully.Key repeat weirdness with EI & IYI finally (after 35 years!) decided to write something a) for 48k speccy b) in z80 assembler. It's been over 20 years since I've written anything in …
... .
If I do DI, everything works perfectly and ... appear.
If I do EI, the wrong pixels appear like ... some interrupt still seems to do "ld (iy), something" causing ... vertical retrace without HALT & EI?
I ...Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... manual says on Page 8 do not use any other supply ... .5Mhz. The ULA provides the INT signal at 50 beats a second ...Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... .5Mhz. The ULA provides the INT signal at 50 beats a second ... being used as the interupt signal generator.
EDIT: I ... has nothing at all to do with the AC then all ...Will Spectrum run @ 60Hz?Sorry to overlap w/ my other recent post, but want to know, if I grab a Spectrum and use it in America with a voltage converter or a different power …
... to generate a picture -- you do, after all, need to be ... cheap new ones from China) do use power frequency to measure ... .5Mhz. The ULA provides the INT signal at 50 beats a second ... the only sane way to do things. All timing derives from ...Interrupt timingsHow long does the ULA hold /INT low for on interrupt on each of the Spectrum models?
... things, we examined the INT signal and I do remember that it stayed ... for TTL logic). So the signal has an effective duration which ...RealXThis may be a dumb question but will RealX ever get released?
... a fetch cycle. We only do Z80_ABUS = IR at the end ... English), he noticed that the INT signal is asserted by the ULA ... the CPLD to detect the INT duration sometimes as 32T and ...Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…
... wondering why you want to do rst#8 traps. I ... line, /CS, /RD, /WR, /INT.
6.2 Indirect ... line, /CS, /RD, /WR, /INT.
I think the ... to determine if an /INT signal has been generated by the ... the bus after the INT ack, the INT could have come ...A question about M1 cyclesI'm writing an interrupt routine that, after the usual register pushes, will jump to a location of my choice with a [b]JP (IY)[/b] instruction. If I…
... 'remember' internally that #IORQ signal was activated, just not [I ... you may have seen the /INT signal apparently being "remembered" on ... peripheral continuing to assert /INT until it sees the acknowledgement ... doesn't do this, though - it merely holds /INT low for ...ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…
... packs can be modified to do so as well.
Do horizontal syncs still occur? I ... in that case does INT still trigger, with ignoring ... meaning that it usurps INT from the Z80's ... I speculate that the INT signal continues being asserted based ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
...
im 2
ei
Forever halt
... a
xor a
ei
reti
... falling edge of the INT signal, the video signal changes its luminance, ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... internal pixel counter? If the INT signal were triggered when HCOUNT==0 ... a falling edge on the INT signal happening at the same time ... be used to generate the INT signal?
Well, it seems ... , but until that, I can do some educated guesses:
Border art viewerRecently, we were working with diver/4d on border art. The idea was to push the techniques of drawing on the border to the limit and to see, how much…
... sets these are visible.
Do you realy need 192+112 ... clones have differing positions of INT signal with respect to the screen ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... INT misalign, the tests are very recent. I also do ... the most demanding demos do not stress test the ... that the _time ones do work as advertised, performing ... case of Pentagon) generates the INT signal. For me, that's ... />
[QUOTE]I do not have a Pentagon of ...Pentagon floating bus timingI wanted to take a little break from working on the ZXDS UI yesterday, so I added support for Pentagon timing instead, so I can finally enjoy the lik…
... unstable environment.[/QUOTE]
How do I know that the frame ... even the most demanding demos do not stress test the emulation ... myself that the _time ones do work as advertised, performing given ... case of Pentagon) generates the INT signal. For me, that's much ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... ULA is correctly producing interrupts, /INT (pin 16) should be pulsing ... (/INT on pin 16). This comes from the ULA. So what signal do ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... (/INT on pin 16). This comes from the ULA. So what signal do ...Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... (/INT on pin 16). This comes from the ULA. So what signal do ... you tried replacing it?
... Do you now get to the ... ?
... If not, what display do you get? What colour is ... not socketed...
... What display do you get? What colour is ...Speccy won't bootHi all, I've got an issue 3 48k that won't boot properly. When I turn it on, it either does one of the two following things, it either displays a …
That INT signal looks good. Do you get the 'FAIL FAIL ... ULA test is entered, or do you have to run the ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... interrupt mode 2 (custom)
ei ;Enable interrupts
... mode 1 (system)
ei ;Enable interrupts
ld ... exit routine, remembering to do
; 'ei' otherwise the interrupt won ... 't happen again:
ei
ret
XPECCY (Lin/Win)im not author of this emulator. Contacts of author you may take on [URL]http://xpeccy.info[/URL] - non official home page. cpu: Z80: all (un)docume…
... 1T/4T;
Screen layout, INT signal, border size, sync signals are ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... as the ULA pulled /INT low, the EI will finish 23 tstates ... after /INT went low. As ... /> [quote]
tstates after /INT went low, and another interrupt ... the int pulse width, using the smallest interrupt routine possible ("EI;RETI ...InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... :
[quote]
Unlike the /INT pin, this is edge-triggered ... I gave an address of, /INT is sampled at the leading ... low / high state of the /INT signal that is important at the ...Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…
I was wondering if this solution could be applied to either the +2, +2A or the +3? They all have a modulator for the tv signal. Do they all use the composite signal to generate this tv signal from?Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…
... a modulator for the tv signal. Do they all use the composite ... signal to generate this tv signal from?[/quote]
Spectrum Composite video connections?Is it possible to modify a standard 48K spectrum to give composite video output? In my experience i have found the quality of the picture out of the…
... a modulator for the tv signal. Do they all use the composite ... signal to generate this tv signal from?[/QUOTE]
signal included on its RGB-Socket ...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…
Yep, that's pretty much what I usually do.
Actually, I usually just do "EI; RET" in my interrupt routines, but that doesn't really help here, hehe.ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... trigger for the analyser was ~INT going low. This is during ... what happens just after the ~INT signal. You'll see some RAS ...
