Search found 918 matches

by dominicbeesley
Tue Jan 14, 2020 2:00 pm
Forum: off-topic
Topic: Colour scheme
Replies: 0
Views: 107

Colour scheme

I'm currently boarding out the room that will become my main office/workshop and I'm going to go for a 1970's theme. I'm thinking maybe some bold wavy/curved stripes on the walls but not sure. Whatever I do I'd like to include the BBC Micro's colour scheme does anyone know what the pantone/web colou...
by dominicbeesley
Tue Jan 14, 2020 1:50 pm
Forum: off-topic
Topic: What is the average age on here??
Replies: 278
Views: 31293

Re: What is the average age on here??

Distinctly average - 47
by dominicbeesley
Fri Jan 10, 2020 11:42 am
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 124
Views: 8803

Re: Raspberry Pi to 1MHz bus interface

I'm interested in how you get on with jlc's assembly service I've not tried it yet but might for my next project at least for the bulk of the smd parts.
by dominicbeesley
Wed Jan 08, 2020 2:19 pm
Forum: hardware
Topic: Raspberry Pi to 1MHz bus interface
Replies: 124
Views: 8803

Re: Raspberry Pi to 1MHz bus interface

Rather than 4245's these might be worth a look - they've proved reliable in most situations _except_ where a CMOS level (say 65c02 clock) is needed. They have the benefit of being bidirectional and fairly fast so a lot of timing issues and logic for direction reversing just goes away http://www.ti.c...
by dominicbeesley
Tue Dec 17, 2019 3:16 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

The blitter can only really do what the cpu does but faster, apart from a couple of fly-leads for the H/V sync signals the blitter sits in the cpu socket all the video circuitry is "original" or RobC's nula. The format of pixels is just the same as the bbc i.e. in 8 byte "character" cells but there ...
by dominicbeesley
Sat Dec 14, 2019 11:37 am
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

Re: B-em and BeebEm N flag in BCD

A realeted question: how good is the mame emulation for the 6502, 65c02, 65816 etc?

I'm looking at hacking it into beebem for the blitter but not sure how cycle accurate and whether it correctly supports illegal instructions.

D
by dominicbeesley
Fri Dec 06, 2019 11:23 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

Now there's a thing I'd not thought of! Double buffering so one action can be set off while the next is being constructed...cool!
by dominicbeesley
Wed Dec 04, 2019 10:06 pm
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

Re: B-em and BeebEm N flag in BCD

Sorry my stupidity knows no bounds when I've got a cold - I was running it as a Master even though I could swear I'd set it as Model B+8271! :oops: Sorry for the time wasting. Sorry Dave! So it looks like it is just BeebEm that gets it wrong in NMOS mode - which I will fix. There doesn't look to be ...
by dominicbeesley
Wed Dec 04, 2019 8:43 pm
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

Re: B-em and BeebEm N flag in BCD

I've also tried v-48e1203 which exhibits the same (incorrect BCD) behaviour - it also fails the Bruce Clark tests

D
by dominicbeesley
Wed Dec 04, 2019 8:39 pm
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

Re: B-em and BeebEm N flag in BCD

I've just checked and the B-em I've been using is on v-8f73f4c - that should contain these fixes?

D
by dominicbeesley
Wed Dec 04, 2019 8:24 pm
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

Re: B-em and BeebEm N flag in BCD

Can you post the actual text of your test program, rather than just an image? Sorry, I had to run and the screenshot was all I had saved. Back in April 2017 several BCD bugs were fixed in B-Em, and the latest code look correct to me It looks like I'm out of date then! Where does one get pre-built B...
by dominicbeesley
Wed Dec 04, 2019 5:38 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

Re: BeebEm Alpha Fork with SID and PAULA sound

Thanks all,

Those Awesome tracks truly are! I neary included 12th warrior on the 2nd disc!

D
by dominicbeesley
Wed Dec 04, 2019 5:34 pm
Forum: projects
Topic: B-em and BeebEm N flag in BCD
Replies: 17
Views: 565

B-em and BeebEm N flag in BCD

Hello, I've been playing around with BCD mode and I think I've found an error in the BCD implementation on both BeebEm and B-em (or I'm doing something stupid). On both emulators a decimal add of &99 to &99 with C set will return &99 as the result with N set (as I would have expected). bcd2.png Howe...
by dominicbeesley
Tue Dec 03, 2019 2:50 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

Re: BeebEm Alpha Fork with SID and PAULA sound

Here you go...
by dominicbeesley
Mon Dec 02, 2019 11:43 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

Re: BeebEm Alpha Fork with SID and PAULA sound

Thanks Arcadian, my two downloads must have been counted as one then! Glad you liked it. If you want to make more then you can try any of the 4 channel "mod" files that are less than 400K from https://modarchive.org/index.php?request=view_by_moduleid&query=105534 download the file and get them into ...
by dominicbeesley
Mon Dec 02, 2019 8:49 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

Re: BeebEm Alpha Fork with SID and PAULA sound

Both me i thought...
by dominicbeesley
Mon Dec 02, 2019 7:50 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

Re: BeebEm Alpha Fork with SID and PAULA sound

Is there genuinely no interest or have I done something daft? So far it looks like nobody has tried the download or have I made a balls of publishing it on GitHub?
by dominicbeesley
Sun Dec 01, 2019 11:55 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

Would there be interest in me doing a BeebEm version that contained the Blitter - this would probably be a fork and unlikely to contain all the extra processors initially? If there's interest I'll start on it now - I'm about to start on a big refactor of the vhdl which is a bit of a mess and will I'...
by dominicbeesley
Sun Dec 01, 2019 11:45 pm
Forum: projects
Topic: BeebEm Alpha Fork with SID and PAULA sound
Replies: 12
Views: 519

BeebEm Alpha Fork with SID and PAULA sound

I've been experimenting with emulators and had a go at implementing the SID and Paula sound cards in BeebEm. I've added an alpha release on GitHub at https://github.com/dominicbeesley/beebem-windows/releases/tag/4.16-dossy-alpha The installer contains some sample disc images for SID and Paula demos....
by dominicbeesley
Fri Nov 29, 2019 1:41 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

The Blitter doesn't do anything with the actual video generation so new modes aren't really possible - though with shadowing in place larger screen modes are possible. At present it's not possible to blit say 2 bits per pixel sprites into a 4 bits per pixel screen map but it might be worth looking a...
by dominicbeesley
Thu Nov 28, 2019 11:38 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

All good points. On the last one I think you're suggesting something akin to bit planes. The blitter as it stands doesn't quite do that but it is definitely now under consideration. On the beeb/Master it's less useful with only 4 planes to go at but could still be of use - I'll have a look as it's p...
by dominicbeesley
Thu Nov 28, 2019 1:23 pm
Forum: hardware
Topic: 1MHz Bus adventures
Replies: 15
Views: 462

Re: 1MHz Bus adventures

Excellent reasons! I've got a lot of computers from the past 40 or so years the Model B nearly always wins out for its combination of simplicity with its array of excellent interfaces (Master 128 is also good but I tend to save that from my tinkering until I'm sure stuff isn't going to let any smoke...
by dominicbeesley
Thu Nov 28, 2019 12:41 pm
Forum: hardware
Topic: 1MHz Bus adventures
Replies: 15
Views: 462

Re: 1MHz Bus adventures

Looks good - I love the 1MHz bus - question though...why not use the user port or is that already busy?

D
by dominicbeesley
Sat Nov 23, 2019 11:44 am
Forum: projects
Topic: Beebem on Github
Replies: 131
Views: 12810

Re: Beebem on Github

Ill try and make a pull req. I'm having trouble with my laptop not being logged in for visual studio...last time i tried an unlock MS locked my account for 28 days which want very helpful so I'm going to tread carefully. The m5000 tweak was minimal so i could try and unpick that from the paula stuff...
by dominicbeesley
Thu Nov 21, 2019 3:00 pm
Forum: projects
Topic: Beebem on Github
Replies: 131
Views: 12810

Re: Beebem on Github

Thanks chrisn,

I'll be in touch soon, I've got the bare bones of something working but not sure if you want it in the main line release? Will discuss when I've got something working - so long as I'm not doing my usual trick of picking up a woefully out of date version as a starting point!

D
by dominicbeesley
Thu Nov 21, 2019 12:04 am
Forum: projects
Topic: Beebem on Github
Replies: 131
Views: 12810

Re: Beebem on Github

I've taken a copy of BeebEm from Github to work on off-line (Plus net have screwed up my house move and I've no broadband for a week other than mobile tethering) There appear to be two Stardot versions: https://github.com/stardot/beebem https://github.com/stardot/beebem-windows I'm I right in thinki...
by dominicbeesley
Mon Nov 18, 2019 10:51 am
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

@mr-macrisc, if I get the triangle plotting done something like that should be possible - though it would also maybe require textured triangle plotting to get enough shades to make it convincing. I looked at Elite but have to say the amount of code to wade through was a bit over-facing - I'd definit...
by dominicbeesley
Sat Nov 16, 2019 12:40 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 120
Views: 12151

Re: A blitter for the beeb?

Thanks for the continuing interest - I know this has been going on for a long time now but real life has to take precedence...sometimes Yes, the CPU when accessing chip RAM/Flash can run at up to 8MHz and that does include when accessing sideways RAM/ROMS. As you say on the Master the ROM slots are ...
by dominicbeesley
Fri Nov 15, 2019 4:42 pm
Forum: software: other
Topic: software troubleshooter for beeb hardware (SelfTestOs)
Replies: 45
Views: 5770

Re: software troubleshooter for beeb hardware SelfTestOs

Levels are all good and this is an otherwise impeccably behaved machine. I didn't have a decent scope on hand to check levels but the LA has a threshold setting and I tested at 1.4V and 2.0V and the data and address lines looked ok. I've attached the E000 version to have a look at. I did some furthe...