Search found 451 matches

by siriushardware
Fri Aug 23, 2019 4:44 pm
Forum: Hatari
Topic: Hatari loads slow and reports errors on RPi3B running Raspbian
Replies: 8
Views: 2479

Re: Hatari loads slow and reports errors on RPi3B running Raspbian

Right, the option of setting Raspbian's own graphics resolution lower, closer to ST-resolution did occur to me although it would be a shame to have to alter the overall graphics resolution of the Raspbian install just to make Hatari 'big' enough to use - but there again, another OS is just an SD car...
by siriushardware
Thu Aug 22, 2019 7:42 pm
Forum: Hatari
Topic: Hatari loads slow and reports errors on RPi3B running Raspbian
Replies: 8
Views: 2479

Re: Hatari loads slow and reports errors on RPi3B running Raspbian

Just thread jacking because the subject is similar and I think it's a good idea to try to keep all related material in one thread rather than scattering it all over. I've just complied the latest build of Hatari 2.2.1 and bearing in mind that the Pi 3 is not the speediest platform around I intention...
by siriushardware
Mon Aug 19, 2019 7:04 pm
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 876

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

Do you have a meter? If so try measuring the voltage your setup is supplying to SCART pin 16. Because vsync is high (+5V) nearly all of the time and only low for a very small percentage of the time, the average voltage coming out from vsync (when not significantly loaded) is nearly 5V, and, assuming...
by siriushardware
Sun Aug 18, 2019 11:19 pm
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 876

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

Logic says that the Schottky diode (with a lower volts drop - 0.1V as against 0.6V for a normal silicon diode like the 1N4148) is actually the better choice, but, as I said in your earlier thread, whatever works, works. Later in the week I will try forcing RGB mode on my 'new' Sony by connecting two...
by siriushardware
Sun Aug 18, 2019 8:01 pm
Forum: Hardware
Topic: STFM powers on but three different error states
Replies: 1
Views: 120

Re: STFM powers on but three different error states

I just took my STFM, preciously working about year ago, out of storage and turned it on and got exactly the same as your screen #3. Unlike yours this behaviour was consistent for me so I took it apart and put the various parts (PSU, Floppy, Mainboard, Keyboard) back together minus the case, same pro...
by siriushardware
Fri Aug 16, 2019 12:00 am
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 876

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

Just a quick update: On impulse, I've bought an oldish 19-inch LCD TV because, unlike any modern small TV on sale, it had every type of video input known to man including 2 * SCART and 2 * HDMI, and PC-VGA so quite a versatile and useful little display, and with the right video leads it can potentia...
by siriushardware
Tue Aug 06, 2019 7:50 am
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 876

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

Indeed, but in the STFM at least, Hsync and Vsync appear to come directly out of the GLUE ic, not via any kind of transistor buffer stage. I have no idea what the drive capability of those outputs actually is. 75R is a low impedance to ask any digital IC to drive directly.
by siriushardware
Sun Aug 04, 2019 4:48 pm
Forum: Hardware
Topic: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation
Replies: 11
Views: 876

Re: Screen sometimes going momentarily black when using a RGB->SCART cable - An attempt of an explanation

Good write-up, thanks Czietz. Tzok has a point about minimising volts drop where Hsync and Vsync have internal resistors, and I wonder if there are some variants of ST (where the Hsync and Vsync may come directly from TTL-level IC outputs) where the Hsync and Vsync outputs may not be able to drive l...
by siriushardware
Sun Aug 04, 2019 10:54 am
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes [solved]

Thank you czietz, I wasn't aware that SCART pin 16 had such a low input impedance, although 75R certainly is a common input impedance for video inputs and in many cases for sync inputs as well. If GokMasE has a variable bench power supply or even just a pair of 1.5V batteries temporarily wired in se...
by siriushardware
Sun Aug 04, 2019 8:49 am
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes [solved]

I have a dim memory that the +12V output on pin 8 of the monitor socket is not present on all ST models, and when it is it comes from 12V via an internal resistor, maybe about 1K. So that resistor (where present) is the upper part of any voltage divider you may try to use to provide a force-RGB-mode...
by siriushardware
Fri Aug 02, 2019 4:53 pm
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

The designations for and uses to which SCART Pins 8 and 16 are put in that diagram are a little bit at odds with the way the pins are described in various other sources of information about SCART, but the main thing is that you have it working: There is a saying in English, perhaps also in Swedish, ...
by siriushardware
Fri Aug 02, 2019 8:03 am
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

Ah, it's annoying when your TV / Display doesn't allow you to force selection of Composite / RGB input mode from within the set's menus. In those cases the default SCART input mode is always Composite, and you have to force selection of RGB mode by supplying a voltage input to SCART pin 16 on the TV...
by siriushardware
Wed Jul 31, 2019 11:37 pm
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

In ST RGB-SCART cables the composite video output from the ST is (usually) wired to the composite video input pin on the TV's SCART connector. In RGB mode the display ignores the 'video' part of the composite signal and uses only the sync part of the composite signal, in addition to the separately w...
by siriushardware
Wed Jul 31, 2019 5:42 pm
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

Well done finding the bent pin. With regard to video, yes, that was where I was going with that particular question. One possibility is that the machine is stuck in mono mode due to a fault on the 'monitor type' sensing input on the ST's video-out socket. There's an easy way to determine if this is ...
by siriushardware
Tue Jul 30, 2019 7:24 pm
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

Do you know if the floppy you tried was formatted, or blank? My real ST is in storage at the moment but I think that if the floppy in the drive is unformatted or formatted in a format which the ST does not know, it will still take a long time to go to the desktop. I think putting a floppy in will on...
by siriushardware
Tue Jul 30, 2019 6:15 pm
Forum: Hardware
Topic: 1040STfm boot failure -> white screen/stripes [solved]
Replies: 21
Views: 1536

Re: 1040STfm boot failure -> white screen/stripes

Unfortunately I feel your change of symptoms after reseating / reinserting ICs may indicate that something has changed for the worse. However, since you made that happen you should be able to make it un-happen just as easily, as long as you have not done something really unlucky, such as putting one...
by siriushardware
Sat Jul 27, 2019 8:31 pm
Forum: Hardware
Topic: Mega STE, white screen in colour mode or TV, black screen in high res
Replies: 28
Views: 2555

Re: Mega STE, white screen in colour mode or TV, black screen in high res

With respect to scopes, I'm not sure how to advise you because I personally much prefer old-school analogue scopes as they show the signal in 'realtime' - with a digital scope there is always a risk that what you are seeing is not a blip or noise on the signal at all, but digital artefacts arising f...
by siriushardware
Thu Jul 18, 2019 10:27 pm
Forum: Hardware
Topic: Mega STE, white screen in colour mode or TV, black screen in high res
Replies: 28
Views: 2555

Re: Mega STE, white screen in colour mode or TV, black screen in high res

I had problems with an STE which had been put away working, was dusted off after about 15 years, worked for about 20 minutes from switch-on and then died. Long story cut short, it was due to pins on the square CPU socket failing to make contact with some of the corresponding contacts on the CPU, alt...
by siriushardware
Tue Jul 02, 2019 9:10 pm
Forum: Hardware
Topic: SM 124 black screen BUT power LED ok and sound
Replies: 26
Views: 4178

Re: SM 124 black screen BUT power LED ok and sound

And the voltages on both ends of those two resistors when the monitor is powered? You should have 12V (more or less) in each case, assuming you readjusted the B+ adjustment to bring the +12V supply back to +12.0V. Also please check the voltages on both ends of R712, and also check the value of that ...
by siriushardware
Mon Jul 01, 2019 5:26 pm
Forum: Hardware
Topic: SM 124 black screen BUT power LED ok and sound
Replies: 26
Views: 4178

Re: SM 124 black screen BUT power LED ok and sound

Sorry, in that case I obviously misread the part numbers of the resistors I wanted you to check. (The markings are very blobby in both cases). I've now cross checked the values with those in the component list - I should have done that in the first place. Here are the resistors (marked on a clip fro...
by siriushardware
Wed Jun 26, 2019 7:15 pm
Forum: Hardware
Topic: SM 124 black screen BUT power LED ok and sound
Replies: 26
Views: 4178

Re: SM 124 black screen BUT power LED ok and sound

Sorry Chandler, it took you a long time to come back on this so I stopped looking. When you adjusted the +27V supply, did you notice what happened to the +12V supply? The B+ adjustment very likely adjusts BOTH rails but the important one to have exactly right in this case is the +12V supply, so rese...
by siriushardware
Tue Jun 25, 2019 9:43 am
Forum: Hatari
Topic: SDL version and Hatari
Replies: 10
Views: 2688

Re: SDL version and Hatari

Believe me, being able to run glxgears at VBL rate (60Hz) is a big step forward for me. I have had Linux running on systems which could only manage about 10-12fps at fullscreen. I would be interested to know if the results shed any light on the system's ability - or not - to run Hatari compiled for ...
by siriushardware
Tue Jun 25, 2019 12:16 am
Forum: Hatari
Topic: SDL version and Hatari
Replies: 10
Views: 2688

Re: SDL version and Hatari

Forgot to mention: glxgears when run at full screen looks very smooth and reports constant 60fps during the run.
by siriushardware
Tue Jun 25, 2019 12:13 am
Forum: Hatari
Topic: SDL version and Hatari
Replies: 10
Views: 2688

Re: SDL version and Hatari

OK, sorry this has taken so long. I have been away for a while. Hatari on this HP i3 based desktop Running Lubuntu is currently compiled for SDL2, as shown by the presence of SDL2 options in the F12 Gui setup menu, Here are the outputs from the commands Eero asked about. Initially. Mesa-Utils and wm...
by siriushardware
Mon Jun 10, 2019 10:34 pm
Forum: Hatari
Topic: SDL version and Hatari
Replies: 10
Views: 2688

Re: SDL version and Hatari

Acknowledging your questions, but I am away from that machine at the moment. I'll try to get back to you with the answers.

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