Search found 1553 matches

by BigEd
Wed Dec 13, 2017 8:08 pm
Forum: hardware
Topic: MMFS Development and Support
Replies: 729
Views: 37556

Re: MMFS Development and Support

Does this second processor connect to the Beeb's Tube connector, or to some other port? Does it have a Tube chip in it? It sounds like it doesn't.
by BigEd
Wed Dec 13, 2017 7:46 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 1297

Re: BBC Master screen interference PiTube direct

(No, sorry, I don't have an internal level shifter. I suppose we could rig up some cabling to use an external level shifter on the internal interface?)
by BigEd
Wed Dec 13, 2017 2:01 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 1297

Re: BBC Master screen interference PiTube direct

Might be worth trying independent power, for those who see the video trouble.

I'd not take the audio breakthrough as too big a clue, as I hear audio noise too on machines which run fine. I think the sound amplifier is very good at amplifying noise!
by BigEd
Wed Dec 13, 2017 1:20 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 1297

Re: BBC Master screen interference PiTube direct

I'm wondering about contention - with the internal adapter, the Pi is on the main 6502 bus. If it's driving the bus at a bad time, would the video ULA pick up the Pi data mixed with the RAM's video data?
by BigEd
Wed Dec 13, 2017 12:55 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 1297

Re: BBC Master screen interference PiTube direct

I don't think this is data corruption, if the screen is OK when BREAK is held down. I think I'm with Dominic, that it could be power supply related. Is it possible with Kjell's internal adapter to cut the power from Master to Pi and to power the Pi separately? Or, is it possible for someone with thi...
by BigEd
Wed Dec 13, 2017 9:37 am
Forum: hardware
Topic: Acorn's Second Processors and the Tube - what, and why
Replies: 21
Views: 1033

Re: Acorn's Second Processors and the Tube - what, and why

I've added a few more points to the bottom of the head post.
by BigEd
Tue Dec 12, 2017 7:45 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

OK, new thread here about the Tube and Second Processors. Please comment there on that.
by BigEd
Tue Dec 12, 2017 7:43 pm
Forum: hardware
Topic: Acorn's Second Processors and the Tube - what, and why
Replies: 21
Views: 1033

Acorn's Second Processors and the Tube - what, and why

I thought I'd try my hand at explaining what the Second Processors are all about. I may well be duplicating some existing explanation - I'll be happy to accept corrections, clarifications and links. See for example the first few paragraphs of Acorn's Tube Application Note , the various resources on ...
by BigEd
Tue Dec 12, 2017 9:41 am
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

These questions and others could perhaps best be handled in a 'getting started with second processors' thread - which may or may not yet exist. Or a page on the BeebWiki. I'm just going out for the day, but might make a start this evening, if no-one beats me to it.
by BigEd
Tue Dec 12, 2017 7:37 am
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

As the FPGA in the Next is one size bigger than the one in the Matchbox , all the Matchbox cores should fit. So, in due course, there's a good chance any of them could be got to run. However, actually making any core work is going to take some fiddling, with a real card. It seems even the Next team ...
by BigEd
Sun Dec 10, 2017 6:59 pm
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 619
Views: 34804

Re: ICE T65/Z80/6809

I haven't been able to get a forecast about the product line, only a response about the specific variant: Please understand that we can't give a suggestion about an availability in the future. All we can say at the moment is, we will take the GODIL40_XC3S250E back into our shop if we will receive i...
by BigEd
Sun Dec 10, 2017 4:57 pm
Forum: hardware
Topic: how to do ? raspberry pi 2 and beeb b lost it
Replies: 57
Views: 1074

Re: how to do ? raspberry pi 2 and beeb b lost it

unzip gives you about 4MB, not 4GB!!
by BigEd
Sun Dec 10, 2017 3:51 pm
Forum: hardware
Topic: how to do ? raspberry pi 2 and beeb b lost it
Replies: 57
Views: 1074

Re: how to do ? raspberry pi 2 and beeb b lost it

And turn on the power! (Ideally power the Pi from the Beeb's 5V line over the Tube cable.)
by BigEd
Fri Dec 08, 2017 10:26 pm
Forum: other vintage computer hardware, software and games
Topic: Computer ad and review compilations
Replies: 6
Views: 297

Re: Computer ad and review compilations

There's a great collection of adverts, many with their background stories, organised by time and by manufacturer, at nosher:
A History of the Early Computer Industry in 300 Adverts
Image
by BigEd
Fri Dec 08, 2017 10:19 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

(Thanks for the photos northernbob! I'm tempted to say that I see relatively few capacitors by the FPGA and the SRAMs - let's see what more experienced eyes see.)
by BigEd
Fri Dec 08, 2017 7:42 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

I'd certainly be happy to see a fully open source release - especially as I'm a backer, and it was described as such.
by BigEd
Fri Dec 08, 2017 7:33 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

I see a number of resistors and resistor networks near the edge connector - I'm interested to find out how 5V-compatible it is. It seems there are those who have doubts as to how safe the resistor network approach is, while the Spectrum Next people believe they've done adequate testing: https://www...
by BigEd
Fri Dec 08, 2017 7:28 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

by BigEd
Fri Dec 08, 2017 6:12 pm
Forum: off-topic
Topic: online study?
Replies: 25
Views: 762

Re: online study?

I wonder if you can confirm a theory of mine, TopBanana - that hiring people is about taking the lowest-risk option. You don't want the best-qualified or the fastest worker or the most personable, rather you want the person who will need least managing and get the job done. If that's right, it's som...
by BigEd
Fri Dec 08, 2017 6:09 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 57
Views: 1297

Re: BBC Master screen interference PiTube direct

hoglet wrote:...
What version of PiTubeDirect are you running?

The best way to tell this is to switch to the 65C02 Co Pro (Co Pro 0), and then enter:

Code: Select all

OLD
LIST

and post a photo of what you get.

Can I recommend

Code: Select all

OLD
LIST ,9

(LIST comma 9) instead?
by BigEd
Fri Dec 08, 2017 6:07 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

I reckon it's the 96k-sized *.FW file - the firmware - which does the job of reading the *.TBU bitstream file and updating the EEPROM. But is this a Z80 application, or something else?
by BigEd
Fri Dec 08, 2017 4:43 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

It includes the following features: - Master 128 mode and Model B mode (including ROM images for both) - the ICE T65 debugger (with AVR supervisor core), wired to the Tx and Rx pins on the esp8266 connector - the 65C02 Co Processor - Beeb SID - Music 5000 This uses about 60% of the LUTs, so things ...
by BigEd
Fri Dec 08, 2017 2:33 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8469

Re: Music 5000 in B-Em

And the emulator should start full-screen!
by BigEd
Fri Dec 08, 2017 11:00 am
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 82
Views: 4138

Re: ZX Spectrum next... Anybody backing ?

Have you had your three boards working yet?
by BigEd
Fri Dec 08, 2017 10:05 am
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1173

Re: Beeb FPGA port to Spectrum Next

Yes, I did wonder if it was worth downloading one of their card images and having a look at the magic file.
by BigEd
Thu Dec 07, 2017 3:12 pm
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 82
Views: 4138

Re: ZX Spectrum next... Anybody backing ?

...and I see you've already fitted a Pi Zero to one of them! (Need some kind of male-to-male adapter? Or soldered a socket on the Pi?)
by BigEd
Thu Dec 07, 2017 3:05 pm
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 82
Views: 4138

Re: ZX Spectrum next... Anybody backing ?

Oh, very nice indeed! I see a number of resistors and resistor networks near the edge connector - I'm interested to find out how 5V-compatible it is.
by BigEd
Thu Dec 07, 2017 9:50 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 619
Views: 34804

Re: ICE T65/Z80/6809

A photo of your contraption - ahem, wonderful creation - would be nice!
by BigEd
Thu Dec 07, 2017 8:40 am
Forum: acorn atom
Topic: ICE T65/Z80/6809
Replies: 619
Views: 34804

Re: ICE T65/Z80/6809

[Oops, I see now I missed an existing reply!] I'm only guessing, but I'd say the bare board version is perhaps still being made, whereas the 2x50-pin version you got is end-of-life. There is, however, quite a bit of stock left. Adding a surface mount 40pin header to the bare board is probably the ea...

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