Search found 1026 matches

by fordp
Mon Dec 04, 2017 11:11 am
Forum: hardware
Topic: Beeb FPGA
Replies: 498
Views: 41369

Re: Beeb FPGA

The SID is fun too and there are lot of really good demo's on this board.

I had a quick try enabling SID yesterday but I must have done something wrong because it did not work. I had no time to look in to what I did wrong as I was called back to the real world ;)
by fordp
Mon Dec 04, 2017 8:17 am
Forum: hardware
Topic: Beeb FPGA
Replies: 498
Views: 41369

Re: Beeb FPGA

Fingers crossed that 2018 can be the year I finally get a reliable FPGA based Beeb/ Spectrum. My first computer was a 16K Spectrum. My brother gave me a BBC system just over a year after that. Next year I should get my Spectrum Next. A port of Beeb FPGA would be the making of it for me. I have a sof...
by fordp
Sun Dec 03, 2017 3:37 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 498
Views: 41369

Re: Beeb FPGA

I just rebuilt the DE1 version of this core. I would play with it if I could find my ps2 keyboard :( It builds OK and seems to run. I just noticed the Papilio DUO link was out of date on the wiki so hopefully I have fixed that assuming the old board had 512K of RAM? P.S. I have found my keyboard an...
by fordp
Sun Dec 03, 2017 3:30 pm
Forum: hardware
Topic: Beeb FPGA
Replies: 498
Views: 41369

Re: Beeb FPGA

I just rebuilt the DE1 version of this core. I would play with it if I could find my ps2 keyboard :( It builds OK and seems to run.

I just noticed the Papilio DUO link was out of date on the wiki so hopefully I have fixed that assuming the old board had 512K of RAM?
by fordp
Sun Dec 03, 2017 12:39 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

Midi is very simple and has a note on message followed (hopefully) by a note off message when the key is released. These messages are three bytes long. Yes, they are but a real MIDI keyboard or external sequencer can send other messages too. It looks like finding the start of the message is easy en...
by fordp
Sun Dec 03, 2017 8:53 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

Any thoughts on how the interface between the module and the emulator would work? A virtual port from which MIDI events can be read and maybe an interrupt to signal when one is available? My memory on this aspect of the system is really hazy. In essence, there's just a hook for dropping in note eve...
by fordp
Sat Dec 02, 2017 9:01 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

(https://gist.github.com/yoggy/1485181) That looks interesting. I did also look to see if Allegro 4 provides any MIDI capability, which it does but then says it only works on DOS and Windows so I also started to look at ALSA on Linux which doesn't look too hard either. What I can't do, though, is t...
by fordp
Sat Dec 02, 2017 10:24 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

I ordered a USB Midi Interface from Ali Express last night for a less that $3. It will be easier than digging out my 20 year old sound blaster midi interface.
by fordp
Sat Dec 02, 2017 8:35 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

Coeus wrote: All that's needed now is to interface to the OS MIDI layer which will be a bit OS-specific, I suspect.
(https://gist.github.com/yoggy/1485181)
by fordp
Fri Dec 01, 2017 8:25 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

We could make a Midi Keyboard emulate that :D

(https://gist.github.com/yoggy/1485181)
by fordp
Fri Dec 01, 2017 7:47 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

Looks like emulating the 4000 keyboard (https://www.retro-kit.co.uk/page.cfm/co ... -Keyboard/) from Midi in messages would be a better option.

P.S.
Here is the circuit diagram : http://www.colinfraser.com/m5000/m2000sch.pdf
by fordp
Fri Dec 01, 2017 7:43 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

Sorry I have no information about this particular Midi Interface. I know a lot about Midi and I have a real BBC Midi Interface which I have owned since the 80's. I also have tons of midi gear in my loft.
by fordp
Fri Dec 01, 2017 7:55 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

That's a two drive (40 conductor) IDE cable. I guess that answers my question! No point adding a second Tube connector onto the board if any IDE cable will do the same thing. It looks like some IDE cables have pin 19 blocked out, and some have pin 28 open circuit on the far end of the connector, fo...
by fordp
Fri Dec 01, 2017 7:52 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 225
Views: 19210

Re: Music 5000 in B-Em

I would be up for adding Midi in on BeebFPGA does anybody have a Circuit Diagram?
by fordp
Thu Nov 30, 2017 7:47 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

myelin wrote:The only problem is if you want to connect the board to a BBC's Tube port, and also connect it to an original second processor, because it only has the one Tube header.
Could you not just make a custom IDC cable with three connectors ?
by fordp
Thu Nov 30, 2017 7:37 pm
Forum: hardware
Topic: FrankenBeeb
Replies: 3
Views: 532

Re: FrankenBeeb

Does sound a bit weird but I had similar ideas of converting all of the 6502 code over to C compiled for an ARM, in particular to allow the PiCopro to really fly. The idea of running a 6502 emulator too is a good one. I must admit I have a queue of projects that I would rather work on first but one ...
by fordp
Fri Nov 24, 2017 7:50 am
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

marcusjambler wrote:Registering interest in a complete board please :D
Obviously never seen my soldering ;)
by fordp
Thu Nov 23, 2017 1:53 pm
Forum: hardware
Topic: ZX81 emulator
Replies: 48
Views: 3528

Re: ZX81 emulator

This has inspired me to try and compile BrandyBasic for the Native Pi Copro. Do you have any plans to make your ZX81 emulator available as that would be a great starting point to prove any toolchain. I will start a Github project for compiling on the PiCopro given the chance :D
by fordp
Thu Nov 23, 2017 1:03 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

Maybe a PCB with both a tube connector and a cartridge slot can be made to allow Beeb, Master and Electron to be monitored? Good thinking. It would look a bit odd but would work well! Cartridge connector on one side, Tube cable header on the other, and header for the lcsoft FX2 board in between. I'...
by fordp
Wed Nov 22, 2017 11:15 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

Maybe a PCB with both a tube connector and a cartridge slot can be made to allow Beeb, Master and Electron to be monitored?
by fordp
Tue Nov 21, 2017 8:01 am
Forum: hardware
Topic: ZX81 emulator
Replies: 48
Views: 3528

Re: ZX81 emulator

Is the information how to build native apps fo the Pi Copro on the Wiki (https://github.com/hoglet67/PiTubeDirect/wiki). Sounds like fun. Great little project.
by fordp
Mon Nov 20, 2017 10:09 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

I do and I thought some pins may be connected together. I have one of the Logic analyser boards too. I also have too many projects on the go :(
by fordp
Mon Nov 20, 2017 9:51 pm
Forum: hardware
Topic: Open Source Logic Analyzer Experiments
Replies: 253
Views: 17525

Re: Open Source Logic Analyzer Experiments

I wonder if a Raspberry Pi cobbler would work to connect the tube to the Logic analyser?
by fordp
Wed Nov 15, 2017 5:39 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 37
Views: 3439

Re: Unix on the Beeb

I've now got this working on the native Pi co-pro. It needs the changes implemented in the Diamondback dev release but seems to be running happily on my 1GHz Pi Zero. As expected, it's much faster than the ARMTDMI and certainly feels comparable to my recollections of using Unix on a mainframe in th...
by fordp
Tue Nov 14, 2017 7:58 am
Forum: hardware
Topic: Arduino Filestore
Replies: 39
Views: 3753

Re: Arduino Filestore

If you use a timer for the Chip Select generation then that should remove your 1us sensitivity. However with interrupts off 1us should be easy to to on the microcontroller.
by fordp
Thu Nov 09, 2017 1:11 pm
Forum: hardware
Topic: Unix on the Beeb
Replies: 37
Views: 3439

Re: Unix on the Beeb

I am guessing you built in for the 26 Bit ARM 2 mode?

Maybe on the Pi CoPro you could build it for the Native ARM mode. This would make it a lot faster ;)
by fordp
Thu Nov 02, 2017 1:13 pm
Forum: hardware
Topic: "Minus One" - 3 x cartridge Electron expansion
Replies: 29
Views: 2965

Re: "Minus One" - 3 x cartridge Electron expansion

I would add two things to this project to make it MUCH better.
1) SD Card Slot to use David Bank's Printer Port MMFS.
2) A built in Flash Chip that emulates at least one cartridge (May as well be able to emulate 3 cartridges in one chip) to allow MMFS with just this board.
by fordp
Thu Oct 26, 2017 6:14 pm
Forum: hardware
Topic: Open source firmware for Gotek floppy emulator released
Replies: 179
Views: 18767

Re: Open source firmware for Gotek floppy emulator released

I have started on supporting DFS disks. It will take me a while as I only spend a couple of hours a week. If anybody want to help out then I could add you to my github fork.

P.S. Maybe an admin should move this to the 8 bit section as DFS is 8 bit really.
by fordp
Mon Oct 23, 2017 8:35 pm
Forum: acorn atom and system
Topic: ICE T65/Z80/6809
Replies: 681
Views: 57640

Re: ICE T65/Z80/6809

flynnjs wrote:The other thing is the pull-ups on one board are in on the other side to the other board.
This shouldn't make any difference.
That's what I said, earlier.

I got the board working, if not the Beeb :(

Well until I snapped a pin.