Search found 1680 matches

by tricky
Sat Jul 22, 2017 3:54 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 4
Views: 107

Re: What would be a suitable D2A resister ladder for the beeb

Thanks Mark, that was exactly what I asked for!
I may have asked for more than I was expecting.
I have a few hundred 10Kohm resisters, but not 1%, so I will try measuring them and see if any are a good match - the amateur/cheapskate approach :lol:
Off to digest this a bit more.
by tricky
Sat Jul 22, 2017 1:04 pm
Forum: off-topic
Topic: Windows 10....
Replies: 101
Views: 5356

Re: Windows 10....

I made the mistake of putting it on a touch pc we have in the kitchen, I did it right at the end of the free upgrade period and it was so slow, I have installed XP. This latest update has stopped supporting my win 8 whql gfx card in my tablet to, so I don't know what to do with that! Fortunately, ou...
by tricky
Sat Jul 22, 2017 12:57 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 4
Views: 107

Re: What would be a suitable D2A resister ladder for the beeb

Thanks Sarah, i'd forgotten I'd already partially asked. I guess it is a matter of calculating the "best" value of R to get the correct volume without shorting out the printer port and the best balance cutting out any clicks from changing values to cutting out to many frequencies. I don't ...
by tricky
Sat Jul 22, 2017 9:37 am
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 4
Views: 107

What would be a suitable D2A resister ladder for the beeb

Since I heard Sarah had a resister ladder digital to analogue converter in her beeb, I have wanted to build one for mine. I want one that can plug directly in to the Audio in on the 1MHz bus (I think that's where it is). The wikipedia article seems very easy to follow, but raises a couple of questio...
by tricky
Sat Jul 22, 2017 8:59 am
Forum: projects
Topic: Experiments in Linear Screen Modes
Replies: 2
Views: 125

Re: Experiments in Linear Screen Modes

Great work Kieran.

There are some very impressive sampled audio tracks on the beeb that seem to be very compressed.
I was wondering if the audio playback code was interleaved with the video code whether it would be possible to play audio through a D2A (resister ladder) on the printer port.
by tricky
Sat Jul 22, 2017 8:48 am
Forum: projects
Topic: Source for an old Centipede game I wrote in '82
Replies: 10
Views: 440

Re: Source for an old Centipede game I wrote in '82

Thanks Michael, good job, you should definitely put you self on the splash screen, something like: Half finished demo by Richard "Tricky" Broadhurst, Fully playable game by Michael Brown. I think I left the fire button on space because I play it with the fire held down and it was easier to...
by tricky
Fri Jul 21, 2017 4:15 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 394
Views: 12354

Re: Palettemate / enhanced video ULA with 4096 colours

There isn't enough memory and the aspect ratio would not be very attractive.
Sorry I didn't pay earlier, we ended up driving south :)
by tricky
Fri Jul 21, 2017 10:35 am
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 121
Views: 7757

Re: Remarkable videos recently posted on Youtube

I'm old school ctrl-alt-del, return.
by tricky
Fri Jul 21, 2017 10:29 am
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 394
Views: 12354

Re: Palettemate / enhanced video ULA with 4096 colours

If you had the space, you could do this in your ula, even just swap one bit of the palette index at a certain point. I need to go and check the versions of elite. Thinking about it, a horizontal swap would be great as it is nearly impossible while doing anything else and I could use it in Warlords f...
by tricky
Thu Jul 20, 2017 11:44 am
Forum: hardware
Topic: Just dug out my old beeb
Replies: 9
Views: 183

Re: Just dug out my old beeb

Most keys can be "fixed" by tapping them a few hundred times. It is probably worth comparing them to the keyboard matrix in the user (advanced?) to see if you have lost a track.
I have seen a power cable with quite a think wrapping of electricians tape and then a couple of cable ties.
by tricky
Thu Jul 20, 2017 11:34 am
Forum: software: other
Topic: osbyte call ? and which adress
Replies: 4
Views: 130

Re: osbyte call ? and which adress

X%, not x%
by tricky
Wed Jul 19, 2017 12:28 pm
Forum: for sale / freebies
Topic: Beeb SD card interfaces for sale
Replies: 21
Views: 1482

Re: Beeb SD card interfaces for sale

Although it would lower the overall quality, you can get 10 micro SD to SD card adaptors for 99p delivered via China from ebay.
by tricky
Tue Jul 18, 2017 9:20 pm
Forum: projects
Topic: Experiments in Stable Raster Timing
Replies: 14
Views: 638

Re: Experiments in Stable Raster Timing

You could pack a few more lines in by using the "mode 7" type addressing, for 1k on the master or 2k on the B.
by tricky
Tue Jul 18, 2017 9:17 pm
Forum: emulators
Topic: MAME: Video handling
Replies: 4
Views: 135

Re: MAME: Video handling

Matt, the mode 7 mapping at &3c00 is model A/B and maybe B+, not on the master as far as I know. I think of it as a minor missing feature that has never been used afaik. Pernod, are you referring to the "mode 7" mapping "bug" or something else? When I looked at MAME, it didn'...
by tricky
Tue Jul 18, 2017 6:39 pm
Forum: emulators
Topic: MAME: Video handling
Replies: 4
Views: 135

Re: MAME: Video handling

I'm sure someone (RichTW?) can explain it better, but R4 (+1) controls how many character lines are drawn before the 6845 starts again by reading the latched values for R12/R13, this is what I meant by "screen". R7 determines when VSYNC happens and a little while (54 scan lines after the e...
by tricky
Tue Jul 18, 2017 12:03 pm
Forum: hardware
Topic: How to modify your MMC Games Menu
Replies: 15
Views: 651

Re: How to modify your MMC Games Menu

I've never tried to add to the menu, I just drop in a new disc and *DBOOT, but I would be interested in knowing a bit more about it, like how it signs files to discs.
by tricky
Tue Jul 18, 2017 11:56 am
Forum: hardware
Topic: OS RAM module
Replies: 76
Views: 2417

Re: OS RAM module

I think someone mentioned that some ROMs use the high bit of their byte as a flag as they "know" that it is spare.
I think it would be worth a go though.
by tricky
Tue Jul 18, 2017 6:58 am
Forum: general
Topic: Today I received.....
Replies: 4026
Views: 202626

Re: Today I received.....

The main "compatibility" issue we had making games was that the millennium 1 didn't do texturing! The firegl 1000 was also a pain, not doing alpha blending with translucency, but with stippling (now back again as alpha to coverage!) I had a mystique and my friend had a Millennium 2 and nei...
by tricky
Mon Jul 17, 2017 6:21 am
Forum: introduce yourself
Topic: In from the cold
Replies: 9
Views: 209

Re: In from the cold

Welcome, I hope you continue your visits.
by tricky
Sun Jul 16, 2017 7:53 pm
Forum: introduce yourself
Topic: Hello from Dublin
Replies: 10
Views: 148

Re: Hello from Dublin

Welcome, it's good to know Ireland is in good hands.
by tricky
Fri Jul 14, 2017 8:02 pm
Forum: hardware
Topic: OS RAM module
Replies: 76
Views: 2417

Re: OS RAM module

Its a bit late now (maybe), but what would be required to add a battery backup?
I would only really see this as useful for using as a trouble shooting aid as otherwise it could be simply *LOADed.
by tricky
Fri Jul 14, 2017 5:52 pm
Forum: software: classic games
Topic: what should i write next?
Replies: 150
Views: 7738

Re: what should i write next?

RipCord and Circus are arcade games that use a paddle, you can "Insert coin" with 5 and start 1/2 players with 1/2, but you need a paddle or analogue joystick to move. Sprint if you have the ROMs is pretty uncontrollable without a steering wheel and Warlords will also be paddle/joystick up...
by tricky
Fri Jul 14, 2017 12:32 pm
Forum: software: classic games
Topic: what should i write next?
Replies: 150
Views: 7738

Re: what should i write next?

The latest versions are in the thread.
Space Invaders still needs a better sound effect, but the one that I put in is as close as I could get to the analogue original.
I did update phoenix to rc2, I don't know if it will ever get any further; it is all their and playable though.
by tricky
Fri Jul 14, 2017 7:02 am
Forum: off-topic
Topic: Having a really bad three weeks!
Replies: 4
Views: 227

Re: Having a really bad three weeks!

If start with cast iron as steel can be tricky at home ;)
by tricky
Fri Jul 14, 2017 7:00 am
Forum: projects
Topic: Experiments in Stable Raster Timing
Replies: 14
Views: 638

Re: Experiments in Stable Raster Timing

And a copy per combination of pixel offsets.
Reminds me of my first really-x demo bitd, it used four pixels per row, but at least I had a convenient place to put the graphics, which were also in four byte chunks :) I think it was RichTW that said that Zaxson on the beeb did the same thing.
by tricky
Fri Jul 14, 2017 6:53 am
Forum: general
Topic: Today I received.....
Replies: 4026
Views: 202626

Re: Today I received.....

flaxcottage wrote:This arrived by post today, a sheet of 0.2mm brass. Now what could it be its use? :lol:
IMAG0859.jpg

A streampunk ashtray cover for a beeb ;)
by tricky
Thu Jul 13, 2017 11:49 am
Forum: software: classic games
Topic: what should i write next?
Replies: 150
Views: 7738

Re: what should i write next?

The 2600 is very hard to emulate on the beeb. Drawing stuff at the correct position involves seeing a couple of counters and a couple of registers and clearing them is just not drawing them next time! I think each game could probably be done as individual simulators, but a generic Tia simulator on t...
by tricky
Thu Jul 13, 2017 11:43 am
Forum: software: other
Topic: He-Man music demo
Replies: 7
Views: 254

Re: He-Man music demo

Love it, it takes me hours to make a beep sound right!
by tricky
Tue Jul 11, 2017 9:08 pm
Forum: off-topic
Topic: Monster 6502
Replies: 10
Views: 386

Re: Monster 6502

This may be the biggest, or at least most spread out 6502 http://hackaday.com/2017/07/08/6502-retrocomputing-goes-to-the-cloud/#more-264367

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