Search found 1915 matches

by tricky
Sun Dec 10, 2017 9:40 pm
Forum: off-topic
Topic: Acorn Art Thread
Replies: 156
Views: 7931

Re: Acorn Art Thread

Love it
by tricky
Sun Dec 10, 2017 8:56 am
Forum: introduce yourself
Topic: IRQ
Replies: 9
Views: 223

Re: IRQ

I was very lucky, dad took me to south Wales to collect my beeb, we had been ringing around everywhere trying to find someone with Beebs. I got a model B, cassette lead with resistors, but I can't remember if we got the AUG their or later.
by tricky
Sat Dec 09, 2017 6:39 pm
Forum: introduce yourself
Topic: IRQ
Replies: 9
Views: 223

Re: IRQ

Welcome, nice introduction.
I learnt 6502 from the AUG, but it a book on assembler programming would have helped. I have asked on a few occasions for assembly programming and D&D books at various libraries, never with any success.
by tricky
Sat Dec 09, 2017 2:33 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 39
Views: 1403

Re: A blitter for the beeb?

I'm not sure how much use there is for an hsync interrupt, as it can easily be re-produced with a timer (at least non-interlaced), the problem with them is that unless you have a RAM expansion that lets you replace the OS, handling them take 30+cycles. Knowing which line you are on without a timer m...
by tricky
Sat Dec 09, 2017 2:22 pm
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

Here's the first few seconds of what I get.. https://youtu.be/NS4JsXxjn4s Ed...... :-) The bits that worry me here are that the bottom part of memory seems to be being set fine and then there is what looks like noise interfering with the data at about 22 seconds in: KarateEd.jpg Not just the bits I...
by tricky
Thu Dec 07, 2017 8:19 am
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

Your inverter certainly seems to invest one pin to the other, what I don't know is if that is what it is supposed to do. From your video, it looks like at least one bit is wrong in one half of the memory, which makes sense as I think there are basically two sets of 16Kx1bit memory banks. From my lim...
by tricky
Wed Dec 06, 2017 11:07 pm
Forum: hardware
Topic: Unusual mask ROM in Master 128
Replies: 8
Views: 235

Re: Unusual mask ROM in Master 128

Bagpuss wrote:...EDIT: Thinking about it, I'm wondering if CS is chip select...

That would explain the inverter ;)
Seems like a lot of trouble, but I guess the alternatives were worse.
by tricky
Wed Dec 06, 2017 10:26 pm
Forum: hardware
Topic: BBC Micro: writes to ROM?
Replies: 10
Views: 358

Re: BBC Micro: writes to ROM?

... I feel like I'm missing something, here. That sideways RAM used the low three bits of the user port to select which "socket" got written to, so setting write to a sideways RAM "just worked" as the DFS tried to overwrite itself. Really upsets the various MMC options though! (...
by tricky
Wed Dec 06, 2017 10:20 pm
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

So, the mode 7 image is rubbish, and looks like the same line repeated, I don't understand how that would happen. Once you get to mode 7, it looks like you have the palette working and some data is being written. Did you have your hi-lo swap on as it seems to be updating the high half of memory firs...
by tricky
Wed Dec 06, 2017 2:09 pm
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

RAM or the circuitry between the 6502 and the RAM. After the mode 7 screen, you should see the mode 0 screen which goes through a few test patterns for the first 16K (leaving a bit unchanged at the bottom so that you can see which bit is supposed to be changing) then repeats for the second 16K with ...
by tricky
Wed Dec 06, 2017 12:06 am
Forum: software: other
Topic: Everygamegoing Now Running At Supersonic Speeds
Replies: 8
Views: 321

Re: Everygamegoing Now Running At Supersonic Speeds

http://www.everygamegoing.com/egg/landingMachineType/index/machine_folder/bbc_mcompact/thing_type/games/ this page ends with: Winter Olympics (1986) (Tynesoft) (BBC Master Compact, 3.5" Disc, English) %HTML_REPORT_SOMETHING_WRONG% and doesn't have any of my games, even though I think they are a...
by tricky
Tue Dec 05, 2017 10:54 pm
Forum: introduce yourself
Topic: Greetings!
Replies: 11
Views: 258

Re: Greetings!

Welcome and good timing, keep an eye in this thread for your CoPro.
I have a City and Guilds in COBOL (with distinction - I think) but have never used it since :?
by tricky
Tue Dec 05, 2017 10:32 pm
Forum: emulators
Topic: MAME: Video handling
Replies: 8
Views: 589

Re: MAME: Video handling

I have some serious graphics corruption on the Master, any suggestions on what could cause this? 0063.png Looks like it thinks parts of the screen are in another mode! Have you captured the memory and tried it in another emulator, in the unlikely event that it is actually the wrong values in memory...
by tricky
Tue Dec 05, 2017 10:25 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 9
Views: 513

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

OK, interested or not, here I go. To build "my" version of a beeb D2A, I use a 26 way IDC connector compatible with the parallel port (I guess you would need centronics for the compact), a Bourns R/2R 10Kohm resistor network (I think designed for D2A applications), a 50v (see above) 1uF (c...
by tricky
Tue Dec 05, 2017 7:24 am
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

Neither of those look like mine, I think it should be 16KB to make it easier to burn.
I found the original thread here, sorry for the confusion.
by tricky
Tue Dec 05, 2017 12:31 am
Forum: hardware
Topic: Problem Beeb MotherBoard
Replies: 68
Views: 1196

Re: Problem Beeb MotherBoard

Assuming that the ROM is my "self test os", it needs to go in the os socket, as your eproms are 32kB, you could put the same image in twice, at 0 and &8000 &4000, or you could tie the highest address line. There are some videos linked here that show what should happen. If your imag...
by tricky
Mon Dec 04, 2017 11:46 pm
Forum: emulators
Topic: Printing a program listing
Replies: 14
Views: 360

Re: Printing a program listing

I've never used a Mac, but often beeb emulators have an option for "logical" or "physical" keyboard mapping; so shift+8 should give an asterisk in one, while shift+: should give one in the other, assuming that : is near the bottom right of the keyboard's main section.
by tricky
Sun Dec 03, 2017 11:23 pm
Forum: introduce yourself
Topic: Hello
Replies: 10
Views: 262

Re: Hello

Welcome, beebem has a handy copy and paste feature of you prefer modern editors.
by tricky
Sun Dec 03, 2017 11:13 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 39
Views: 1403

Re: A blitter for the beeb?

If your blitter can target a single destination address, then you already have single channel support when combined with a parallel port D2A.
http://stardot.org.uk/forums/viewtopic.php?f=3&t=13468
by tricky
Sat Dec 02, 2017 7:36 pm
Forum: archive submissions
Topic: Pernod's Music Collection
Replies: 12
Views: 1485

Re: Pernod's Music Collection

Thank you Andy, I was amazed by muproc bitd, although I never had the talent to use it.
by tricky
Sat Dec 02, 2017 3:55 pm
Forum: hardware
Topic: MMC card interface
Replies: 685
Views: 69417

Re: MMC card interface

Did anyone say for sure if there is any danger when connecting CB1 directly to PB1? I've looked around and having had a problem on a couple of my beebs, I was wondering if this might have been a contributing factor, when combined with badly behaving software. Would it be better to connect them with ...
by tricky
Fri Dec 01, 2017 9:32 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 9
Views: 513

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

My R2R ladders arrived, so the MKII looks quite a bit neater and takes much less time to construct. I still haven't added the filter/smoothing cap, but it works well for what I want. I should connect the scope up and see how well it works with some better test data and see what the coupling cap is d...
by tricky
Wed Nov 29, 2017 6:59 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 17
Views: 553

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

I can't confirm yet, but should be ok for sat+sun, room for a beeb and laptop would be good.
by tricky
Wed Nov 29, 2017 5:26 am
Forum: introduce yourself
Topic: Introducing myself
Replies: 12
Views: 294

Re: Introducing myself

Welcome, your journey sounds quite familiar and I'm keen to see how you find the beeb with its quirks. I have made a few Arcade posts for the beeb as well as a few single game emulators in the style of name, you'll find them via my signature and some are on [url]bbcmicro.co.uk[/url]. Enjoy your visi...
by tricky
Tue Nov 28, 2017 11:25 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 39
Views: 1403

Re: A blitter for the beeb?

I'm pretty sure that the NES 1983 had DMA and I seem to remember a thread around here about, I think DMA ideas for the elk.
by tricky
Tue Nov 28, 2017 7:24 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 39
Views: 1403

Re: A blitter for the beeb?

That's a great piece of work. =D> Do you know if there was much use of the GXR made in the beeb or even the version built in to the master? If there was, then an accelerated version included with the board may give a little backwards compatibility. When I suggested sprites for the NULA, the first th...
by tricky
Mon Nov 27, 2017 6:22 pm
Forum: projects
Topic: Going great guns on a Prince of Persia port...
Replies: 159
Views: 10324

Re: Starting a Prince of Persia port...

Did you try having a lut for scan lines?
Maybe have 0 for not indexed, followed by the usual data or indexed for the most common 255 scan lines?
I may try some other methods later.
by tricky
Mon Nov 27, 2017 2:08 pm
Forum: hardware
Topic: What would be a suitable D2A resister ladder for the beeb
Replies: 9
Views: 513

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

I finally got around to building this and as usual, I had a few teething problems, mostly me getting the IDC connector upside down and wiring all the inputs to GND and shorting out two of the data pins (I think). As is my style, I tried to build the minimal solution - I don't know why I do this, as ...
by tricky
Mon Nov 27, 2017 8:10 am
Forum: introduce yourself
Topic: Hi from Peterborough, CAMBS
Replies: 14
Views: 301

Re: Hi from Peterborough, CAMBS

I do have a desolder station, but you haven't seen how I solder idc connectors :lol:
http://stardot.org.uk/forums/viewtopic.php?f=3&t=12869&hilit=mmc#p165772
by tricky
Sun Nov 26, 2017 6:15 pm
Forum: introduce yourself
Topic: Hi from Peterborough, CAMBS
Replies: 14
Views: 301

Re: Hi from Peterborough, CAMBS

Welcome,
I've just been doing a bit of soldering myself (in my usual ham-fisted way) and got the IDC connector upside down again, so no extra sound for me, I'll update my thread when I can get my phone to talk to my PC to upload some photos.

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