Search found 2328 matches

by BigEd
Wed Feb 20, 2019 8:24 pm
Forum: general
Topic: Should the Elk have been a 'full' Beeb?
Replies: 170
Views: 10654

Re: Should the Elk have been a 'full' Beeb?

As a counterpoint, they put as much functionality as they could fit in that ULA, and I rather suspect they didn't have spare pins for byte wide memory. (And using page mode was a bandwidth win too, for those consecutive nibbles. Possibly this was a lesson they took forward for the ARM's signalling o...
by BigEd
Wed Feb 20, 2019 3:49 pm
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 209
Views: 16932

Re: Proposed: "The Ultimate Electron Upgrade"

Although the LX9 FPGA is not a cheap chip, I'm not sure it's the major source of discomfort. Even if there were a cheaper chip which could support a less powerful replacement, there are still problems: - interoperation with 5V - fitting into the CPLD's position on the board, which isn't a common soc...
by BigEd
Wed Feb 20, 2019 10:39 am
Forum: hardware
Topic: Proposed: "The Ultimate Electron Upgrade"
Replies: 209
Views: 16932

Re: Proposed: "The Ultimate Electron Upgrade"

(Something probably worth reiterating from the head post: there could be a switch so the Ultimate ULA was pretty much completely Elk compatible - things like Mode 7 and Turbo modes would not be compulsory. They would be there if you need them. So this Ultimate ULA could resurrect a well-loved person...
by BigEd
Wed Feb 20, 2019 8:03 am
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 12
Views: 311

Re: The 8-Bit Guy's new 65816 based computer

There's usually one or two mistakes like this in his videos - I resist the temptation to shout at the screen. Indeed, the Pi is a full computer, and an ARM computer, but it's not a Linux computer. Although it's true to say that most people think it is, so from a marketing perspective, building a pro...
by BigEd
Tue Feb 19, 2019 8:44 pm
Forum: other vintage computer hardware, software and games
Topic: The 8-Bit Guy's new 65816 based computer
Replies: 12
Views: 311

Re: The 8-Bit Guy's new 65816 based computer

I'll watch this with interest! $50 target ($100 limit) sounds good.
by BigEd
Tue Feb 19, 2019 4:04 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

dv8 wrote:
Tue Feb 19, 2019 12:39 pm
This will play the first few notes
Hee hee - that's delightfully 8-bit!

You can *EXEC THUSZAR from this ssd:
thuszar.ssd
(200 KiB) Downloaded 4 times
by BigEd
Mon Feb 18, 2019 5:07 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

Thanks for the sound commands dv8. I wonder if two or three choice notes/chords from
Also Sprach Zarathustra, Op. 30 - Strauss
mightn't be in order. Perhaps the two chords at 0:46... or at 1:05. I'm admit, it's more or less a ta-da!
by BigEd
Mon Feb 18, 2019 4:29 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

Oh, dv8, it would be great if you could render your 3 ROMs as SOUND/ENVELOPE commands!
by BigEd
Sun Feb 17, 2019 5:26 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

(Thanks for the ROMs, dv8, I'll load them up just as soon as... well, fairly soon.)
by BigEd
Sun Feb 17, 2019 10:05 am
Forum: acorn atom and system
Topic: A Website dedicated to the Acorn System Computers
Replies: 18
Views: 416

Re: A Website dedicated to the Acorn System Computers

Nice site! I would suggest that each page should have a link back to the home frame, in case someone lands on a subpage directly, like this
http://www.oddys.plus.com/Acorn/Systems/system_5.html

Which could happen from a search result, for example.
by BigEd
Sun Feb 17, 2019 10:04 am
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

Yes, I think people have said that different chips come up with different sounds. But I think in most cases it's a low tone from all three oscillators.
by BigEd
Sun Feb 17, 2019 8:42 am
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Re: Ideas please for better beep when Second Processor is present

I like the idea of a boo-beep-boo-beep, but boo-beep-beep might work too. 'tada!' would be great!

BTW, on the OWL logo ROM, I'd be tempted to do as Linux did, and show two OWLs if there are two processors. Or three if there's also a second second processor!
by BigEd
Sat Feb 16, 2019 8:16 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 29
Views: 567

Ideas please for better beep when Second Processor is present

It's a sad fact of life that the Beeb's double-beep at startup doesn't happen when you have a second processor attached. And yet, such a supercharged Beeb surely deserves to have an impressive sound at startup. I think it must be possible for the second processor boot rom to issue any number of SOUN...
by BigEd
Sat Feb 16, 2019 7:27 pm
Forum: upcoming and recent events & exhibitions
Topic: Anything coming up in SW UK?
Replies: 18
Views: 995

Re: Anything coming up in SW UK?

I spotted a few Beebs at the RISC OS event in Bristol - it's a good sized venue and there's plenty of space for an ABUG event, I would think. I tagged onto RobC's demo of VideoNuLA and Domesday, and revaldinho's demo of the various second processors in the Pi. We typed in one or two of the "unattend...
by BigEd
Sat Feb 16, 2019 6:44 pm
Forum: programming
Topic: Master 128 + second processor + second second processor
Replies: 9
Views: 302

Re: Master 128 + second processor + second second processor

A very cunning plan! And it worked too!
by BigEd
Fri Feb 15, 2019 6:02 pm
Forum: general
Topic: Bit of fun Part Two - CPU Swap
Replies: 28
Views: 631

Re: Bit of fun Part Two - CPU Swap

A little more on those faster Z80s here . They were by no means widely used but they did appear in the market: A number of computers shipped with the Z80B, including: Brascom BR1000M IPTVT TIM-S (Romanian ZX Spectrum clone) M.G.T. Sam Coupé Osborne Executive Panasonic FS A1 WX (MSX) Sharp MZ-2500 (S...
by BigEd
Fri Feb 15, 2019 4:31 pm
Forum: general
Topic: Bit of fun Part Two - CPU Swap
Replies: 28
Views: 631

Re: Bit of fun Part Two - CPU Swap

I think Acorn rather liked their approach of interrupt-driven I/O - elsewhere, people used DMA.
by BigEd
Fri Feb 15, 2019 3:42 pm
Forum: general
Topic: Bit of fun Part Two - CPU Swap
Replies: 28
Views: 631

Re: Bit of fun Part Two - CPU Swap

It was terrible! 200 to 600 cycles, depending on bus width.
by BigEd
Wed Feb 13, 2019 11:00 pm
Forum: general
Topic: Bit of fun Part Two - CPU Swap
Replies: 28
Views: 631

Re: Bit of fun Part Two - CPU Swap

Kazzie wrote:
Wed Feb 13, 2019 10:41 pm
Excluding the System 5, which already had a 2MHz 6502 card.
Oh, that's nice - new to me.
by BigEd
Wed Feb 13, 2019 10:04 pm
Forum: general
Topic: Bit of fun Part Two - CPU Swap
Replies: 28
Views: 631

Re: Bit of fun Part Two - CPU Swap

Don't forget that the BBC/Proton had a 6502 running twice as fast as that in the System and Atom. So in this alternate reality, Acorn would already have made a 4MHz Z80 system and would be looking to double the performance... and the Z80 didn't have the headroom for that, I think. Perhaps Acorn woul...
by BigEd
Tue Feb 12, 2019 10:47 pm
Forum: general
Topic: Beeb Spotting
Replies: 54
Views: 4780

Re: Beeb Spotting

Reading about the early days of computer chess, this jumped out at me: http://en.chessbase.com/portals/4/files/news/2011/kasparov21-1985.jpg Afterwards Garry demonstrated his skills in computer games on the Acorn computer – and was crushed by the child on Frederic's lap, who was three years old at ...
by BigEd
Tue Feb 12, 2019 6:08 pm
Forum: general
Topic: What was your most shining BBC moment at school?
Replies: 23
Views: 772

Re: What was your most shining BBC moment at school?

I'm just a bit too old to have met a Beeb at school, but I do remember two early programs I wrote and was quite happy with: - a 3D wireframe dodecahedron, which rotated at some fraction of one frame per second. Computer animation! Not even hidden-line removed, if I remember correctly. And in Basic. ...
by BigEd
Mon Feb 11, 2019 6:39 am
Forum: bbcmicro.co.uk
Topic: Taking a break
Replies: 10
Views: 592

Re: Taking a break

I'm sorry to hear how you feel. ... I just hate to see members being upset. Likewise! It's worth bearing in mind that what might feel like consensus, or a group decision, might actually just be one person expressing an opinion. There's a risk that a poster who is frequent, or emphatic, or persisten...
by BigEd
Thu Feb 07, 2019 6:37 am
Forum: general
Topic: Why was Repton so loved by BBC users yet so disliked by the Commies?
Replies: 72
Views: 1942

Re: Why was Repton so loved by BBC users yet so disliked by the Commies?

That's a great list! It would be interesting to know how many of their respective 8 bit micro designs contained custom chips. For the most part, I would expect the volume not to justify full custom designs - as noted, Commodore was in a special place and had its own decision-making logic. It's notab...
by BigEd
Wed Feb 06, 2019 4:55 pm
Forum: general
Topic: Why was Repton so loved by BBC users yet so disliked by the Commies?
Replies: 72
Views: 1942

Re: Why was Repton so loved by BBC users yet so disliked by the Commies?

Sorry, by no-one else I meant other 8-bit computer makers. There were from the outset several second source licensees of the 6502 MPU, set up by MOS as was normal very early on, before the Commodore acquisition. (Although I'm not crystal clear on what rights Atari had, or who made their custom chips...
by BigEd
Wed Feb 06, 2019 10:38 am
Forum: general
Topic: Why was Repton so loved by BBC users yet so disliked by the Commies?
Replies: 72
Views: 1942

Re: Why was Repton so loved by BBC users yet so disliked by the Commies?

Commodore owned their chip fab and their designs, including the 6502. They were free to do whatever they wanted, if they could decide what that was and wait for it to be done. It's notable that the tweaks to the 6502 were tweaks, not wholescale redesigns. No-one else had the fab, or the CPU license,...
by BigEd
Tue Feb 05, 2019 10:04 pm
Forum: software: other
Topic: BBC *Status Command (and odd characters)
Replies: 24
Views: 472

Re: BBC *Status Command (and odd characters)

dp11 wrote:
Tue Feb 05, 2019 3:47 pm
The report giving (c) 1986 is also interesting.
Indeed. What is Basic 6?
by BigEd
Tue Feb 05, 2019 3:25 pm
Forum: software: other
Topic: BBC *Status Command (and odd characters)
Replies: 24
Views: 472

Re: BBC *Status Command (and odd characters)

(can you learn anything with *SPOOL and a subsequent *DUMP?)
by BigEd
Tue Feb 05, 2019 2:10 pm
Forum: general
Topic: Bit of fun - One change only
Replies: 68
Views: 1754

Re: Bit of fun - One change only

I like it!
by BigEd
Tue Feb 05, 2019 9:45 am
Forum: hardware
Topic: RGB to HDMI using a Pi Zero and a small CPLD
Replies: 621
Views: 25309

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

Thanks! I think that shows it really well.