Search found 2369 matches

by tricky
Sun May 20, 2018 7:24 am
Forum: hardware
Topic: Screaming CUB monitors
Replies: 8
Views: 176

Re: Screaming CUB monitors

Coincidentally my daughter played that for me on friday evening, we both hear laury, but she still complains about my TVs. :lol:
by tricky
Sat May 19, 2018 8:31 pm
Forum: software: classic games
Topic: How many versions of Frogger were there?
Replies: 7
Views: 252

Re: How many versions of Frogger were there?

Nice, but you cut the crock a bit close ;)

You can see how someone did something in a post by clicking the quote button, which then shows you the source.
by tricky
Sat May 19, 2018 6:23 pm
Forum: hardware
Topic: Screaming CUB monitors
Replies: 8
Views: 176

Re: Screaming CUB monitors

I don't know about CUBs, but my daughter complains whener I turn on any of my CRTs.
I remember when I was a kid, I could hear most CRTs, but some would start and stop, I don't know why.
by tricky
Sat May 19, 2018 6:21 pm
Forum: emulators
Topic: Video Timing
Replies: 31
Views: 1082

Re: Video Timing

Good news, Frogger should be correct for 50hz non-interlaced, but maybe the TV doesn't like non-interlaced at 50hz. It may also be h-sync/v-sync timing that it isn't keen on, I'll try and find some docs. In other news, I found another type of 6845 behavior today. In frogger, only the first scanline ...
by tricky
Sat May 19, 2018 2:37 pm
Forum: introduce yourself
Topic: Hello from Australia
Replies: 11
Views: 159

Re: Hello from Australia

Welcome
by tricky
Thu May 17, 2018 6:31 pm
Forum: general
Topic: Today I received.....
Replies: 4570
Views: 301398

Re: Today I received.....

My boards are here from JLCPCB. 30 dual Atari joystick to beeb and 10 dual megadrive to beeb adapters boards, shame I'm away for the weekend at Revival and probably won't get to build any. boards.jpg The mega drive ones support 1 button each or 2 buttons on one or with software support (see Warlords...
by tricky
Thu May 17, 2018 5:51 am
Forum: hardware
Topic: Fixed it!
Replies: 3
Views: 193

Re: Fixed it!

I use the cut off legs from fitted x2 caps to lie where a track has been broken from one hole back to the nearest through hole component or even resistor legs for lighter work.
by tricky
Wed May 16, 2018 10:20 pm
Forum: emulators
Topic: Video Timing
Replies: 31
Views: 1082

Re: Video Timing

I think it must be a shadow ram issue.
Try turning shadow Ram off.

Ps I did put code in for WE Shadow ram, but as I had never had a master, assumed that Shadow ram was of by default.
by tricky
Wed May 16, 2018 6:11 pm
Forum: software: classic games
Topic: How many versions of Frogger were there?
Replies: 7
Views: 252

Re: How many versions of Frogger were there?

I have a vague recollection of a type in, but that's all :oops:
Are you planning a comparison video for YouTube?
by tricky
Tue May 15, 2018 9:26 pm
Forum: introduce yourself
Topic: Hello!
Replies: 9
Views: 177

Re: Hello!

Welcome, we usually warn people about the caps, but it seems you don't need warning ;)
Have you found bbcmicro.co.uk yet?
by tricky
Mon May 14, 2018 9:47 pm
Forum: emulators
Topic: Video Timing
Replies: 31
Views: 1082

Re: Video Timing

PS, if R12/13 aren't latched as I expect, scramble will look very wrong.
by tricky
Mon May 14, 2018 9:37 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

Scan line 6 works, 7 doesn't as it messes up the vsync by seemingly adding a whole 127 row frame (until the counter wraps). It looked like when it didn't work, that it still had 1 line frames, but it could be that the 127 rows vere just blank and the correct images was only showing some of the time....
by tricky
Mon May 14, 2018 7:31 pm
Forum: emulators
Topic: Video Timing
Replies: 31
Views: 1082

Re: Video Timing

We know from Frogger that there are at least two different 6845s in Masters, unless several have been replaced.
The issue where the last line of the display has rubbish in it and then an additional scan line with more rubbish.
This only occurred on some masters, but not on any Model Bs AFAIK.
by tricky
Mon May 14, 2018 7:17 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

Moving R4=0 to the previous scan line (6) fixes the issue, but as far as I can tell, anywhere on the last line (7) causes the problem. What makes this hard to understand, is that even only doing it on the first row (not every interrupt) doesn't work, but does set the rows per frame to 0. So, it seem...
by tricky
Mon May 14, 2018 2:52 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

Visual 6502 have a 6845 in their queue but haven't started decapping it yet.
I don't think Frogger set it near the beginning of the line, but scramble may be seeing it around the end of the horizontal display.
by tricky
Mon May 14, 2018 12:14 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

Thanks guys. RichTW, I think you are correct about somehow missing the end of frame, this would happen if rows were set to 0 before the 6845 had finished the previous frame. Hoglet, thanks, my scope is a cheap USB only thing, but has been useful. I'm reassured that it works on beebfpga, as I suspect...
by tricky
Mon May 14, 2018 5:50 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 65
Views: 3674

Re: RGB to HDMI using a Pi Zero and a small CPLD

Does this project have enough debug info to help with a problem that I am having in this Scramble thread http://stardot.org.uk/forums/viewtopic.php?f=57&t=14988&p=203125#p203125?
by tricky
Mon May 14, 2018 5:46 am
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

I was fully setting the background colour and back between the r12/13 sets, so it wasn't tight at all. I tried a few selections for sync pulse widths in case that was the problem. Everything should be the same as frogger at the end of the frame, just less updates during the frame. I'll check if frog...
by tricky
Sun May 13, 2018 8:06 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

I did try a few each way, but they just roll and the scope can't find the vsync.
by tricky
Sun May 13, 2018 4:42 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

Sorry Rich, i was hoping you would come to the rescue but I must be missing something.
There are 28 visible with the last line being the first of the last frame's 12 lines (27+12=39).
I'm missing something with the 26+24=39!
by tricky
Sun May 13, 2018 1:02 pm
Forum: introduce yourself
Topic: Hello :)
Replies: 9
Views: 226

Re: Hello :)

Welcome.
You might like to search for beebwiki.
by tricky
Sun May 13, 2018 12:56 pm
Forum: hardware
Topic: sideways Ram
Replies: 8
Views: 171

Re: sideways Ram

I'm not familiar with ComStar, but you could try space+bread or d+break or load another copy of basic over the top of ComStar until you want it again.
by tricky
Sun May 13, 2018 11:53 am
Forum: software: new games
Topic: New version of Scramble for the beeb (just starting)
Replies: 33
Views: 1528

Re: New version of Scramble for the beeb (just starting)

I'm a bit stuck / my 6845 foo is failing me :( I am trying to have the screen setup similar to Frogger, but with half the interrupts. b-em, beebem and jsbeeb (great 6845 debugging info) all seem to agree that this should work and produce a stable image. My TV and silly scope (I'm not that good at dr...
by tricky
Sat May 12, 2018 10:18 pm
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 967

Re: SN76489 best sample playback?

I'll have to check the part number, but unless I got the code wrong, it didn't reset. That is, it played perfectly on jsbeeb, but not on my beeb.
I'll have to try and remember which one it was, but it came from a batch from someone who bought them from a school.
by tricky
Sat May 12, 2018 12:10 pm
Forum: for sale / freebies
Topic: Free, via Twitter: Beeb stuff in Canterbury
Replies: 16
Views: 950

Re: Free, via Twitter: Beeb stuff in Canterbury

Finally got some time to start on the Masters today, mostly cleaning up after the initial attempt to stop the corrosion from the batteries. The one master is missing keyboard and power supply, so it will have a longer wait, but at least it isn't rotting any more. The other one is complete and after ...
by tricky
Sat May 12, 2018 11:48 am
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 967

Re: SN76489 best sample playback?

The SN76489AN used in most (all?) BBCs does indeed reset the bit sequence when writing to the noise control register. I know the NCR 8496 does not (this is required by the LucasArts Tandy music driver), not sure about the other chips. Most then as I have one that doesn't and seems to be factory fit...
by tricky
Sat May 12, 2018 6:08 am
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 967

Re: SN76489 best sample playback?

I vaguely remember that I played with setting frequency to 1 years ago, but I don't think it works, although I think it does on some other versions of the chip. On another version, I believe that the bit sequence is reset when setting the noise frequency, so that that can also be used to get a stead...
by tricky
Fri May 11, 2018 4:53 pm
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 967

Re: SN76489 best sample playback?

Sample playback in the usual emulators can sound from different to completely unrecognisable, so always test on Real HW, but then I guess it won't work for people emulating. Also watch out for emulators that reset the timer when data is sent, I think this is how some of the SN76489 chips work, but n...
by tricky
Tue May 08, 2018 9:24 pm
Forum: emulators
Topic: Which emulator to use: developing on Windows (VS2017)...
Replies: 4
Views: 234

Re: Which emulator to use: developing on Windows (VS2017)...

I build beebem with vs2017, although I always have dxsdk2010june installed. It is very easy to mod to add the type of features you describe. I have also hacked importing of the labels that beebasm can export as well as auto saving break and watch points relative to those labels. I was thinking of ad...
by tricky
Mon May 07, 2018 9:11 pm
Forum: hardware
Topic: Use old PC gamepad with Beeb: are they compatible?
Replies: 4
Views: 135

Re: Use old PC gamepad with Beeb: are they compatible?

PC joysticks were originally analogue, but the they just provide different resistances and the PC card does the rest. The beeb is given two voltages and returns a value between them which the chip in the beeb turns into a number. Here is the thread with that EEVBLOG video http://stardot.org.uk/forum...