Search found 925 matches

by fordp
Thu Jan 04, 2018 10:57 pm
Forum: other vintage computer hardware, software and games
Topic: Early 70s Calculators
Replies: 43
Views: 2424

Re: Early 70s Calculators

My perception from BITD: Sinclair: remarkable Commodore: affordable TI: capable HP: unattainable For some reason, Casio and Sharp didn't pique my interest much. Later on, I came to like Sharp. From my perspective, it was rather different... At school when I discovered that electronic calculators ex...
by fordp
Thu Jan 04, 2018 10:20 pm
Forum: software & utilities for the pc, mac or unix
Topic: BBC micro style keycaps for modern keyboard
Replies: 26
Views: 634

Re: BBC micro style keycaps for modern keyboard

Maybe having the extra Atom keys made too would make it more interesting. Atoms are rare and expensive and worth remaking I think. Did I see a perspex atom case somewhere or am I making that up?
by fordp
Sat Dec 16, 2017 10:25 am
Forum: hardware
Topic: Open source firmware for Gotek floppy emulator released
Replies: 56
Views: 3062

Re: Open source firmware for Gotek floppy emulator released

https://www.ebay.co.uk/itm/3-5-Floppy-Disk-Drive-USB-Emulator-Simulation-For-GOTEK-Music-Electronic-Organ/232081793751?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D20151016114640%26meid%3D90b66f5378c64da38f5b516a35c3c1e6%26pid%3D100507%26rk%3D1%26rkt%3D1%26&_trksid=p2045573.c1005...
by fordp
Fri Dec 15, 2017 3:33 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 55
Views: 1203

Re: BBC Master screen interference PiTube direct

Hi, When designing the first version of the master card I had the same problem, but I thought it was noise on the datalines. Because when I added the inline 330ohm resistors on the data lines the noise was gone. I will change the design and make new cards. I will see what we can do with replacing t...
by fordp
Fri Dec 15, 2017 3:31 pm
Forum: hardware
Topic: BBC Master screen interference PiTube direct
Replies: 55
Views: 1203

Re: BBC Master screen interference PiTube direct

I have have seen this on my Master with internal PI CoPro.
by fordp
Thu Dec 14, 2017 12:52 pm
Forum: hardware
Topic: Acorn's Second Processors and the Tube - what, and why
Replies: 11
Views: 798

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

Nice write up Ed. Although I do need to pick up on a few points. The Tube hardware in the Beeb is not that special. There are plenty of other computers from the 1980s and 1990s that have equivalent signals available on an expansion port. And if someone wanted to, the Beeb's 1MHz bus could do a simi...
by fordp
Mon Dec 11, 2017 11:11 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1151

Re: Beeb FPGA port to Spectrum Next

afraid am gonna be slacking a bit, this week. its crazy party season going on here! am booked up for the next 7 days (well 6+1 star wars film) ` an external tube connection` am a bit confused with your wording there. thats an actual circuit in the fpga? btw, with regard to cores....is there a maste...
by fordp
Mon Dec 11, 2017 2:41 pm
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1151

Re: Beeb FPGA port to Spectrum Next

That diagram does include 0 and 1 for earlier pi's they had to do some swapping about for later pi's and I think it was i2c ports that got swapped.
by fordp
Sat Dec 09, 2017 10:50 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8397

Re: Music 5000 in B-Em

Steve, I've just been doing a bit of regression testing on the code in the sf/m4000 branch. (And also trying to get the right packages installed on my new Ubuntu 16.04 (64 bit) system.) I currently have the following in b-em.cfg: [midi] jack_enabled = 0 alsa_seq_enabled = 0 alsa_raw_enabled = 0 als...
by fordp
Fri Dec 08, 2017 9:47 am
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1151

Re: Beeb FPGA port to Spectrum Next

hoglet wrote:
Does Spectrum Next make use of Xilinx multi-boot (i.e. multiple cores in the same flash ROM)?
Dave


From what I read they seem to have some system for loading cores from the MicroSD card.

I have no idea how that could work however :(
by fordp
Fri Dec 08, 2017 9:43 am
Forum: hardware
Topic: Beeb FPGA port to Spectrum Next
Replies: 40
Views: 1151

Re: Beeb FPGA port to Spectrum Next

I am hoping this is going to be my favourite thread ever. My first computer was a Spectrum, my second a BBC B, my next toy after that a 32016 Second Processor.

The Spectrum Next should be able to do all of that ;)

Are you a backer Dave (hoglet) ?
by fordp
Fri Dec 08, 2017 8:04 am
Forum: other vintage computer hardware, software and games
Topic: ZX Spectrum next... Anybody backing ?
Replies: 82
Views: 4032

Re: ZX Spectrum next... Anybody backing ?

Maybe we need a new thread for BeebFPGA on the Next?

I have a feeling this platform will be more popular than all the others put together and more. At least for me ;)

As it is a Beeb it can go in the 8 bit hardware section :D
by fordp
Thu Dec 07, 2017 9:38 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8397

Re: Music 5000 in B-Em

Thanks.

Each Midi byte take 320us so 3 bytes is 960us of latency as a minimum. This is for Midi from a keyboard over a traditional midi cable.
by fordp
Thu Dec 07, 2017 1:19 pm
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8397

Re: Music 5000 in B-Em

How does the latency compare to a pro midi synth?
by fordp
Wed Dec 06, 2017 9:03 am
Forum: hardware
Topic: Beeb FPGA
Replies: 473
Views: 27884

Re: Beeb FPGA

by fordp
Wed Dec 06, 2017 8:16 am
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1018
Views: 79168

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Hard drive access is polled, so the data is flung at the Tube at exactly the speed the hard drive chooses to make data available to the CPU. This is an issue as the ADFS hard drive transfer loop is very tight and depends almost entirely on the instructions themselves for the inter-byte delay, so if...
by fordp
Tue Dec 05, 2017 7:03 pm
Forum: hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)
Replies: 1018
Views: 79168

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 274MHz)

Does anyone know if solidisk at 4MHz ends up overclocking the tube? If so I'm afraid it is very unlikely to ever work. I'd doubt that but it may interfere with phi1 like the WE 32K RAM does. That could throw your timing off as 2MHzE is derieved from phi1 not phi2O on the Beeb IIRC. I'd love to see ...
by fordp
Tue Dec 05, 2017 9:47 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8397

Re: Music 5000 in B-Em

Coeus will be a much better software engineer than me if he can get some code working first time without any way of testing it ;)
by fordp
Tue Dec 05, 2017 8:17 am
Forum: emulators
Topic: Music 5000 in B-Em
Replies: 203
Views: 8397

Re: Music 5000 in B-Em

I just looked at the code and it looks good to me. I am also waiting on my interface. I will try and give it a whirl when it arrives. I have no idea how to use ample / M500/M5000 however.
by fordp
Mon Dec 04, 2017 11:11 am
Forum: hardware
Topic: Beeb FPGA
Replies: 473
Views: 27884

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: 473
Views: 27884

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: 473
Views: 27884

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: 473
Views: 27884

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: 203
Views: 8397

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: 203
Views: 8397

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: 203
Views: 8397

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: 203
Views: 8397

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: 203
Views: 8397

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: 203
Views: 8397

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: 203
Views: 8397

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

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