Search found 2464 matches

by tricky
Wed Jun 13, 2018 4:31 pm
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5187

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

He might mean big pixels.
Having the option is good and we might be able to sneak a feature or two in when Hoglet isn't looking.
I'll still be filling the back seat of my car with CRTs when going to a show though ;)
by tricky
Wed Jun 13, 2018 2:28 pm
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 870

Re: 640x512 50 fps Bad Apple on a B... how?!

I know it doesn't matter here, but you could detect that you were going to run out of time and leave any bytes only Changing 1 bit until the next frame, prioritising ones that have several similar neighbors.

Ps prioritising ones means picking them first for deferring.
by tricky
Wed Jun 13, 2018 2:23 pm
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 870

Re: 640x512 50 fps Bad Apple on a B... how?!

For the full frame swap, you could just update the pallet (offscreen) ;)
by tricky
Wed Jun 13, 2018 6:29 am
Forum: introduce yourself
Topic: Back to Acorn
Replies: 10
Views: 233

Re: Back to Acorn

Welcome.
I'm enjoying the Vancouver club news.
by tricky
Wed Jun 13, 2018 6:28 am
Forum: introduce yourself
Topic: Back to Acorn
Replies: 10
Views: 233

Re: Back to Acorn

Welcome.
I'm enjoying the Vancouver club news.
by tricky
Tue Jun 12, 2018 9:19 pm
Forum: acorn atom
Topic: What is a good PSU for a 5V modded Atom?
Replies: 4
Views: 88

What is a good PSU for a 5V modded Atom?

What is a good PSU for a 5V modded Atom? I'm planning on removing and keeping the extra RAM and ROM and replacing them with a modern board, so I think 1.2A will be enough. A tour of ebay suggests: £9 GENUINE ORIGINAL MW MD050S120 IC REGULATOR POWER SUPPLY ADAPTER 5V 1200mA seems to have screws! UK b...
by tricky
Mon Jun 11, 2018 6:41 am
Forum: projects
Topic: New game - tube type thingy
Replies: 49
Views: 3331

Re: New game - tube type thingy

Looking very good. Are you heading for a straight race like sprint, or more like simple Mario cart? The tube certainly gives it a unique look. Is two player simultaneous an option? I guess that would make controlling the ship even harder. Or even linking two beebs? Would it be more playable if you b...
by tricky
Sat Jun 09, 2018 1:56 pm
Forum: introduce yourself
Topic: Well Hello!!
Replies: 14
Views: 179

Re: Well Hello!!

When I was a teenager, I did a distance learning course in COBOL.
We had to write our code on coding sheets and post it off, where it was punched on to cards and fed into a mainframe.
We got quite a few syntax type errors and round trip on compilations was about a week and a half!
by tricky
Sat Jun 09, 2018 1:29 pm
Forum: hardware
Topic: Monitors
Replies: 48
Views: 806

Re: Monitors

At first glance, that TV looked like it had a massive grey bezel! In the 80s, video copying kits were popular over here, usually a 5 pin din to 5 pin din lead plus 5pin din to RCA plus a small pile of RCA to stuff, including the composite connector on the beeb. I probably have 20+ of thos somewhere ...
by tricky
Sat Jun 09, 2018 1:14 pm
Forum: introduce yourself
Topic: Well Hello!!
Replies: 14
Views: 179

Re: Well Hello!!

I wasn't being negative about how a game is selected with a GOTEK (I've just ordered one for myself). What I meant to say before I got distracted was that taking a few seconds to find a game (like thumbing through a disk box) and then taking a few 10s of seconds to load means that you might play the...
by tricky
Sat Jun 09, 2018 6:46 am
Forum: introduce yourself
Topic: Well Hello!!
Replies: 14
Views: 179

Re: Well Hello!!

The gotek is good for a smaller number of disc images as swapping is about the same as changing a real disc, including finding it in the box (selecting it) and is probably the most compatible disc substitute. If you don't have a disk interface, for about £12 you can get a ready built MMC (I think fr...
by tricky
Sat Jun 09, 2018 6:29 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 55
Views: 1336

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

At the moment, I can only make Saturday and although I will put a beeb in the boot, I might just sit in the canteen area when not chatting, so you don't need to reserve me a space.
by tricky
Sat Jun 09, 2018 6:21 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 575
Views: 46484

Re: Palettemate / enhanced video ULA with 4096 colours

As you can set the palette and then run any existing game, everything is supported. The nula comes with a shadow of the beat demo, which makes great use of the palette and scrolling as well as some sample palettes (listed in the manual I think). My frogger (scroll up for pictures) has been updated t...
by tricky
Fri Jun 08, 2018 6:35 pm
Forum: programming
Topic: left and right brackets on beebem
Replies: 7
Views: 275

Re: left and right brackets on beebem

Brackets are arrows in mode 7
by tricky
Fri Jun 08, 2018 5:33 pm
Forum: general
Topic: How far gone must a BBC be to be unfixable?
Replies: 23
Views: 778

Re: How far gone must a BBC be to be unfixable?

For me, if the PCB was gone, I would probably put in an FPGA with options to switch between different beeb models.
This would be more useful for me and as I have quite a few "real" ones, I would feel OK.
by tricky
Fri Jun 08, 2018 5:28 pm
Forum: introduce yourself
Topic: Hello fellow Microites
Replies: 15
Views: 243

Re: Hello fellow Microites

SSL error (I think), me too, but not seen it before.
by tricky
Fri Jun 08, 2018 7:42 am
Forum: introduce yourself
Topic: Hello fellow Microites
Replies: 15
Views: 243

Re: Hello fellow Microites

Welcome, we have salt in everything savoury and the Scots put it in their portage porridge. I ran a small chain of video shops in the 80s before the "new' age ratings came in and things were a little wild west back then. You could also look up red triangle films when channel 4 started; yes, we start...
by tricky
Thu Jun 07, 2018 11:53 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5187

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

I hoped that it might work as the converter will clean up the signal colour, as long as the timing isn't affected too much.
by tricky
Thu Jun 07, 2018 11:49 am
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1841

Re: Video Timing

...Are we sure that R12/13 take effect when set in the final scanline of the previous frame?... Scramble sets one address (for then next 8 scan lines) and then immediately sets the the one for the following frame (8 scan lines). lda #CrtcR13Screen1stCharLo : sta CrtcReg : lda crtc_r13 : clc : adc #...
by tricky
Thu Jun 07, 2018 6:02 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 99
Views: 5187

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

I don't know if it might dirty the signals, but I would have thought an old parallel port switch would do. It might be a little big.
by tricky
Thu Jun 07, 2018 5:57 am
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 870

Re: 640x512 50 fps Bad Apple on a B... how?!

I use it in my self test OS to save X as it doesn't rely on any working ram.
by tricky
Wed Jun 06, 2018 7:39 pm
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 870

Re: 640x512 50 fps Bad Apple on a B... how?!

Could the playback have been done bitd with some simple counters and 74 series logic and a large ROM? A counter that increments when a read from the second 16 bytes happens after the previous one being from the first 16 bytes. This would be used to address the ROM for reads for the first 16 bytes. A...
by tricky
Wed Jun 06, 2018 5:56 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 157
Views: 16180

Re: Remarkable videos recently posted on Youtube

A little demo/review of white light and the darkness of raven wood. https://youtu.be/U6r3ohFXG0w
by tricky
Wed Jun 06, 2018 5:20 pm
Forum: hardware
Topic: Early BBC Micro's (ICL)
Replies: 9
Views: 526

Re: Early BBC Micro's (ICL)

Aaron76 wrote:
Sun Jun 03, 2018 11:58 am
Be interested to hear what others have out there, are there any other early survivors?
I have an issue 2 000758 viewtopic.php?f=3&t=10296&hilit=serial
by tricky
Wed Jun 06, 2018 10:55 am
Forum: hardware
Topic: Open source firmware for Gotek floppy emulator released
Replies: 140
Views: 10667

Re: Open source firmware for Gotek floppy emulator released

I did notice in the other thread that someone asked about selecting disk images from the beeb, possibly by requesting out of range tracks.
Is there a way to do this from software running on the beeb, or would a connection to, say, the user port currently be required?
by tricky
Wed Jun 06, 2018 7:42 am
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1841

Re: Video Timing

Perhaps it might be worth adding a line of total adjust before and after the main 256 lines to allow the vertical total to be set in the adjust line in case we come across a 6845 that doesn't add the extra line (may also make HW match SW).
by tricky
Tue Jun 05, 2018 2:41 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1841

Re: Video Timing

Sorry, I was half asleep when I wrote that, assuming you have many "screens" per field, you would get many blank bits, not what you want.
Unless you are going in and out of mode 7, the vertical timing doesn't change, so apart from one long/short row, the timing shouldn't be too far off.
by tricky
Mon Jun 04, 2018 11:17 pm
Forum: off-topic
Topic: Modern mice
Replies: 20
Views: 569

Re: Modern mice

I prefer Microsoft mice and have only broken on since the 90s. I replaced the micro-switch and it's good as new.
by tricky
Mon Jun 04, 2018 11:15 pm
Forum: introduce yourself
Topic: REPEAT:PRINT "Hello, stardot. ";:UNTIL FALSE
Replies: 10
Views: 272

Re: REPEAT:PRINT "Hello, stardot. ";:UNTIL FALSE

Welcome, might we also see you at an ABUG, or have you also been sneaking in to them ;)
by tricky
Mon Jun 04, 2018 11:13 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1841

Re: Video Timing

Would it be "safer" to add a total adjust (R5) of 8 scan lines and then change your mode in that section, with 38 rows and vsync one row earlier? If I understand what you are doing, and I might have missed it, this would make everything match as well as supporting any 6845s that don't add the extra ...