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Weird tv output by spectrum 48kI recently got a spectrum 48k and hooked it up to my tv. After finding channel 36, I get a really weird picture for the spectrum, why is that? Below…
... random test with the following pattern (persisting even after a ULA swap ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... attribute fetch goes unnoticed and ULA always fetches the pixels from ... , or because the +3 ULA intentionally delays the flip, or ... way how the +3 ULA prepares the screen address on ... emulators accurately.
[QUOTE]test #0 ... the first two lines ... -
Grey +2 DiedHi all, Thrashing my +2 playing Mugsy last night and it did this... [URL="https://m.flickr.com/photos/83515822@N05/13012551693/lightbox/"]https://m…
... supply must be present. The ULA is at least partly working ... of one of the system test ROMs could be very informative ... -
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…
... a bit annoying kind of test).
The way in ... it wants to;
2. "ULA" attempts reading a byte from ... -
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…
... it wants to;
2. "ULA" attempts reading a byte from ... Lion17 describe (the delay of ULA fetches) sounds much more complicated ... I have modified the stime test so you can now adjust ... I have added the atime test for testing the attribute into ... -
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…
... a custom version of the test with a different number of ... Lion17 describe (the delay of ULA fetches) sounds much more complicated ... I have modified the stime test so you can now adjust ... I have added the atime test for testing the attribute into ... -
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…
... just be lost and the test will simply continue, but with ... a custom version of the test with a different number of ... demanding demos do not stress test the emulation enough. Shadow screen ... the specified T cycle after ULA (or "ULA" in case of Pentagon ... -
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…
... just be lost and the test will simply continue, but with ... it is very easy to test by just adding one more ... demanding demos do not stress test the emulation enough. Shadow screen ... the specified T cycle after ULA (or "ULA" in case of Pentagon ... -
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…
... a way to write a test exposing this, I'll probably ... duration properly, like the original ULA did, they simply let it ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... intended duration which the 128K ULA generates - we know for sure ... 32 in case of 48K ULA, but I have seen a ... this, other than that the test loop must have become misaligned ... -
New test for finding missing +2A/+3 ULA timing detailsHello, having added the +2A/+3 emulation recently, I want to make sure I got the ULA timing 100% right. We know when the contention pattern starts, …
... with the interrupt, rendering the test results questionable.
I ... not, to make sure the test results can be fully trusted ... 48K machine with 6C001E-7 ULA all consistently returned 69888/YES ... -
48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …
... issue 6A with a 5C112E ULA in it, seemed to work ... />
How thoroughly did you test it? Did you not see ... timing issues of using a ULA < 6C001E-7 -
Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... br />
[B]The Spectrums ULA[/B]
[IMG] ... kindly let me borrow a ULA to try in the ... now sent back the borrowed ULA and also sent him ... my ULA which he has said he will test for me ... . Hopefully I can then eliminate the ULA from ... -
48k+ ULA'sI've got three ULA's here that only work in certain boards. Thought I was going nuts, swapping, changing stuff around. But hey, I've got two working …
... six versions of the Spectrum ULA.
5C102E
5C112E ... to get samples made and test incrementally. Not the usual approach ... left like the 6C001E-6 ULA? The 5C112E screen matrix looks ... of the imperfections of the ULA (non-centred screen, etc.) but ... -
48k no beeper soundGot a 4S that outputs no beeper sound but does output from the mic ok, replacement speaker?
Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... other things you want to test. My own stuff is still ... these projects (Clashbasher, Spectra, ULA+) in different personal directions doesn ... generators into an imitation of ULA+, so that us developers ... used alongside an actually installed ULA+ still as a second ...Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …
... Mouse
00fe = ULA EQU #FE; ULA
;
0003 ... c9 RET
; *
; Test the BREAK key
;
Interface 1bis updateSupport for connecting a standard PC keyboard to the interface?s PS/2 socket, in place of a mouse, has been added. The external keyboard?s output is …
... Mouse
00fe = ULA EQU #FE; ULA
;
0003 ... c9 RET
; *
; Test the BREAK key
;
48k no beeper sound (again!)Got three 48k+ here, all of which have the same exact problem, no sound out the beeper, same problem as detailed [URL="http://www.worldofspectrum.org…
... a meter on resistance to test between the speaker connections. A ... " for every pulse that the ULA outputs a high on pin ... on the collector terminal. The ULA pin 28 voltage on diode ... 0.7V less (than the ULA pin voltage) on diode D9 ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... RWAP sent me back the ULA and told me it's ... . I have also tried the test using some wire to disable ... the border colour in the ULA starts with a random value ... when trying the Upper RAM test the border always appeared white ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... .
It's not the ULA, as this has been tested ... the "wire impersonates a key" test.
You have tested the ... bus pull-up resistors ("resistor test Mark suggests in schombi's ... /> Do you have any other test gear, e.g. a logic ...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…
... message appears, as the memory test will have completed at that ... connectors.
Swapped the ULA and tried again. Same as ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... or socket.
Test between IC1 (ULA) pin 33 and edge ... as /IORQULA).
Test between IC1 (ULA) pin 33 and IC2 ... 20 (/IORQ).
Test between IC1 (ULA) pin 33 and IC2 ... after the first test.
Test between IC1 (ULA) pin 12 and ...Spectrum Not Responding to Keyboard InputHello, sorry if this thread is not in the correct place, This is my first post and I'm not sure where to post this type of thread. :lol: Anyway, I r…
... socket.
Test between IC1 (ULA) pin 33 and edge ... as /IORQULA).
Test between IC1 (ULA) pin 33 and IC2 ... 20 (/IORQ).
Test between IC1 (ULA) pin 33 and IC2 ... after the first test.
Test between IC1 (ULA) pin 12 and ...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…
... socket.
Test between IC1 (ULA) pin 33 and edge ... as /IORQULA).
Test between IC1 (ULA) pin 33 and IC2 ... 20 (/IORQ).
Test between IC1 (ULA) pin 33 and IC2 ... after the first test.
Test between IC1 (ULA) pin 12 and ...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…
... />
Answers:
Test between IC1 (ULA) pin 33 and edge ... [/COLOR]
Test between IC1 (ULA) pin 33 and IC2 ... ohm [/COLOR]
Test between IC1 (ULA) pin 33 and IC2 ... [/COLOR]
Test between IC1 (ULA) pin 12 and IC2 ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
Did the tests:
Test between IC1 (ULA) pin 33 and edge ... kOhm[/COLOR]
Test between IC1 (ULA) pin 33 and IC2 ... kOhm[/COLOR]
Test between IC1 (ULA) pin 33 and IC2 ... kOhm[/COLOR]
Test between IC1 (ULA) pin 12 and IC2 ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
[QUOTE=schombi;767251]Test between IC1 (ULA) pin 33 and ...
[QUOTE=schombi;767251]Test between IC1 (ULA) pin 33 and IC2 ...
[QUOTE=schombi;767251]Test between IC1 (ULA) pin 33 and IC2 ...
[QUOTE=schombi;767251]Test between IC1 (ULA) pin 12 and IC2 ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... the board. I repeated this test, but it stays at [COLOR ... repeated (using different ranges) IC1 (ULA) pin 33 and IC2 (Z80 ... leads around after the first test
[COLOR="Red"]--> 18 ...Yellow issue 4A keyboard madnessNote sure if this is a similar problem to the one CornishManicMiner has, but one of my yellow issue 4A boards is driving me crazy. I had it in variou…
... board. I repeated this test, but it stays at ... of the circuit to IC1 (ULA) pin 33 is okay. ... keyboard from working. This test was done to confirm that ... (using different ranges) IC1 (ULA) pin 33 and IC2 (Z80 ... leads around after the first test
[COLOR=Red]--> ...
