Search found 2098 matches

by tricky
Wed Feb 21, 2018 7:33 am
Forum: emulators
Topic: Double-clicking .SSD overrides VDU 14 ?!
Replies: 5
Views: 168

Re: Double-clicking .SSD overrides VDU 14 ?!

Locally I did reduce the time shift was simulate down for, it doesn't need to be held for long.
I was going to set the keyboard bit that makes break auto boot and then turn that off after a second or so, but never got around to it; I don't know if its state is cached at startup or checked each time.
by tricky
Tue Feb 20, 2018 9:14 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 134
Views: 5989

Re: Open Source Logic Analyzer Experiments

I think you need a logic analyser or scope from here, but you might get away with piggybacking new chipson top of the old ones one at a time until things improve. Depending on how the faulty chip has failed, this might work, but I'm not sure what the worst case is.
by tricky
Mon Feb 19, 2018 10:20 pm
Forum: hardware
Topic: B+64K - 12k sideways ram working
Replies: 14
Views: 410

Re: B+64K - 12k sideways ram working

Internal co-pro is nice, but matchbox or pi are practically internal.
Cartridge slots and a simple second user port, maybe the master does win :cry: would have been even better if it had sold a few million.
by tricky
Mon Feb 19, 2018 5:21 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 40
Views: 1253

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

Thanks, I ordered a nearly identical board with a 5v to 3.3v converter onboard (I'll report when it arrives from China). I really want to try some CPLD/FPGA programming and this looks like a good place to start. Now, if I could find another 20 or so hours per day, I might get to try all the things I...
by tricky
Mon Feb 19, 2018 12:36 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 40
Views: 1253

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

Is it sufficient to set the position once per field? Dave One per frame would be enough as half the frames would require one mid frame and one off screen. It would probably be better to do what you were thinking in the first place and just ignore mode 7. If you mean once for the whole frame, no as ...
by tricky
Mon Feb 19, 2018 12:19 pm
Forum: projects
Topic: Making reasonable progress with a Sudoku solver
Replies: 22
Views: 489

Re: Making reasonable progress with a Sudoku solver

Jeremy, have you considered MODE 7 (teletext, one byte per character), you could have lines or colour or a much larger grid for both.
by tricky
Mon Feb 19, 2018 9:40 am
Forum: hardware
Topic: B+64K - 12k sideways ram working
Replies: 14
Views: 410

Re: B+64K - 12k sideways ram working

I've always thought of the B+ as the "best" beeb, but since I found out about the masters "proper" Shadow ram (video), it's less clear. For me, the B/B+ still wins as the master has the ADC at the "wrong" memory address and is missing the speech chip socket. The ADC add...
by tricky
Sun Feb 18, 2018 6:24 pm
Forum: projects
Topic: Making reasonable progress with a Sudoku solver
Replies: 22
Views: 489

Re: Making reasonable progress with a Sudoku solver

Very nice, and twice as fast as my C++ one running on a laptop! :oops:
by tricky
Sun Feb 18, 2018 6:09 pm
Forum: development tools
Topic: Couple of BeebASM usage questions.
Replies: 10
Views: 260

Re: Couple of BeebASM usage questions.

I have a build.bat that does this in a subroutine with parameters: if exist copy.ssd del copy.ssd ren game.ssd copy.ssd ..\tools\beebasm.exe -i game.asm -di copy.ssd -do game.ssd Whatever game.ssd SAVEs will be added to game.ssd. I use this to build the self extracting compressed ROMs that the newes...
by tricky
Sun Feb 18, 2018 12:08 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 134
Views: 5989

Re: Open Source Logic Analyzer Experiments

Looks like b7 is incorrectly set when a0 is 0 in the lower banks and one of the bits is stuck on in the high banks.
You can run the test in an emulator to see what it should look like.
by tricky
Fri Feb 16, 2018 7:16 pm
Forum: emulators
Topic: B-Em
Replies: 279
Views: 13586

Re: B-Em

I did post visual studio project and solution files along with a few minor changes to build on Windows, but I'm not sure where that was.
The biggest problem was finding the correct versions of the libraries, but otherwise it was fine.
by tricky
Fri Feb 16, 2018 2:04 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 138
Views: 12842

Re: Remarkable videos recently posted on Youtube

Who is this 'Richard Broadhurst" bloke :D
by tricky
Fri Feb 16, 2018 11:18 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3346

Re: SpectROM - Speccy emulator for the Pi co-pro

I was hoping that NuLA could control it and that a NuLA reset could be used to reset the frame, but I guess not.
by tricky
Fri Feb 16, 2018 10:56 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3346

Re: SpectROM - Speccy emulator for the Pi co-pro

It's only interlace, but the user manually has to choose to swap the fields if they are the wrong way around unless some one has found a way to detect which field is showing.
Rob, does NuLA know which field is showing/can it set it?
by tricky
Thu Feb 15, 2018 1:32 pm
Forum: development tools
Topic: Couple of BeebASM usage questions.
Replies: 10
Views: 260

Re: Couple of BeebASM usage questions.

There is a command line option to export the symbols, I think in swift format, it's easily posted, I do this to export so that beebem, load them for debugging. You can save multiple files by having multiple SAVE statements or by using the template option to load a disc image and then add to it, this...
by tricky
Wed Feb 14, 2018 10:31 pm
Forum: hardware
Topic: Myelin's in-system updateable MegaROM for the BBC Master 128
Replies: 14
Views: 609

Re: Myelin's in-system updateable MegaROM for the BBC Master 128

If the blue thing was in a riser with long legs, would the extra couple of mm be enough?
by tricky
Wed Feb 14, 2018 5:08 pm
Forum: introduce yourself
Topic: Hi from uh, me :)
Replies: 8
Views: 225

Re: Hi from uh, me :)

Welcome, look out for the STH (Stairway to Hell - sister site) archive with a menu suitable for MMC installations, or the newly available version for DataCentre, assuming you have/get one or the other.
by tricky
Wed Feb 14, 2018 6:58 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3346

Re: SpectROM - Speccy emulator for the Pi co-pro

Yes.
I found one of my sprint videos for what it sounds like.


http://youtu.be/enupZbjSNck

PS it doesn't sound quite like I remember it, in my head it was more like manic miner.
by tricky
Tue Feb 13, 2018 8:25 pm
Forum: introduce yourself
Topic: new to BBC
Replies: 11
Views: 222

Re: new to BBC

Welcome, glad youg found us.
by tricky
Tue Feb 13, 2018 8:20 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3346

Re: SpectROM - Speccy emulator for the Pi co-pro

I've only done it from assembler, remember to set the sound volume to silent and I'm not sure if the conversion rate of clicks per second to frequency, but it might be ok. IIRC I used it for the engine noise in my sprint emulator.
by tricky
Tue Feb 13, 2018 8:10 pm
Forum: introduce yourself
Topic: Hi from foxtrotter
Replies: 7
Views: 169

Re: Hi from foxtrotter

Welcome, and glad to hear you are enjoying your visits.
by tricky
Tue Feb 13, 2018 1:20 pm
Forum: off-topic
Topic: Dodgy PSUs from China
Replies: 4
Views: 341

Re: Dodgy PSUs from China

I did notice that some of the cheap PSUs have a warning that they were built as part of a "project", which a guess means by some kind of students or home build returns!
by tricky
Tue Feb 13, 2018 1:18 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 113
Views: 3346

Re: SpectROM - Speccy emulator for the Pi co-pro

Rob, have you tried using "periodic noise" with the frequency controlled by the sound channel for lower frequencies?
by tricky
Tue Feb 13, 2018 1:15 pm
Forum: emulators
Topic: Latest version of BeebEm
Replies: 28
Views: 2912

Re: Latest version of BeebEm

I didn't see it mentioned, but the sound desync's from the video in the recorded AVI if vsync is disabled, I haven't checked when not disabled, but I guess as no one has mentioned it, it is probably OK. This maybe just my video editing software. Locally, I save and reload watches and breakpoints as ...
by tricky
Tue Feb 13, 2018 8:14 am
Forum: hardware
Topic: BBC Master noob
Replies: 48
Views: 1140

Re: BBC Master noob

That picture looks like a B.
It's quite easy to add a socket to the beeb so that the internal speaker is disconnected when you plug something in. I do all my Beebs and many my SCART leads with a plug for audio, very hand for when the volume at a show keeps changing.
by tricky
Mon Feb 12, 2018 4:19 pm
Forum: software: games - high scores
Topic: keyboards on PC to play games: Ignored keys with other keys pressed
Replies: 13
Views: 338

Re: keyboards on PC to play games: Ignored keys with other keys pressed

I don't know about linux, but I checked A+Z+RETURN on half a dozen keyboards running windows, none would pass on the RETURN in an editor or using the "higher level" APIs, but all would give RETURN using the lower level messages. I suspect that you can get A+Z+RETURN with the "right&qu...
by tricky
Sun Feb 11, 2018 8:04 am
Forum: hardware
Topic: Screen shadow memory
Replies: 18
Views: 538

Re: Screen shadow memory

I support it for loading samples in AstroBlaster, detecting it by looking for the ROM signature, but that's all.
by tricky
Sat Feb 10, 2018 4:28 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 138
Views: 12842

Re: Remarkable videos recently posted on Youtube

I'm not sure about recent or remarkable, but I was watching EEVBLOG this morning about how PC joysticks worked and noticed a few beeb mentions/overlays which suggest he may be a fan, at least of the electronics.

by tricky
Sat Feb 10, 2018 4:04 pm
Forum: off-topic
Topic: Dodgy PSUs from China
Replies: 4
Views: 341

Dodgy PSUs from China

Our DVD player recently suffered a catastrophic failure in the high voltage side of the PSU, so after seeing several components with exhaust marks on the PSU i decided that I would order a cheap replacement from China. The first one arrived, I had splashed out a whole £4 after deciding that the £2 o...