Raspberry Pi to 1MHz bus interface

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dp11
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Raspberry Pi to 1MHz bus interface

Post by dp11 »

I've designed a small PCB to connected a Raspberry Pi to the 1MHz bus . It is designed to fit under and Beeb or a master with a PiZero.

It is designed to be easily assembled and so only uses through hole parts, just resistors and diodes and connectors.

I might in future think about putting together a kit of parts.

I'm just about to get a batch of PCBs made on a reasonably quick turn around. If you want to be a very early adopter let me know and I'll up the order size. Blank PCBs are £2 + postage.

At this stage this is untested , and I may never actually complete the Pi code.
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hoglet
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Re: Raspberry Pi to 1MHz bus interface

Post by hoglet »

Put me down for one please.

Dave
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Elminster
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Re: Raspberry Pi to 1MHz bus interface

Post by Elminster »

I can put one together on my next mass solder day. Put me down for one please. I am good as breaking stuff in testing, which is what you want ?
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Re: Raspberry Pi to 1MHz bus interface

Post by fordp »

I will take one please.
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IanB
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Re: Raspberry Pi to 1MHz bus interface

Post by IanB »

Put me down for 5 please.
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Re: Raspberry Pi to 1MHz bus interface

Post by marcusjambler »

Please put me down for two boards :)
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paulv
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Re: Raspberry Pi to 1MHz bus interface

Post by paulv »

I'd be interested in two please.

Paul
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myelin
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Re: Raspberry Pi to 1MHz bus interface

Post by myelin »

Please put me down for two. Thank you!
SW/EE from New Zealand, now in Mountain View, CA, making Beeb/Elk/Arc hardware projects for fun.
Most interesting: Arcflash, POST Box, Ultimate Electron Upgrade
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Re: Raspberry Pi to 1MHz bus interface

Post by RobC »

I'd like two if possible please.
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Re: Raspberry Pi to 1MHz bus interface

Post by BeebMaster »

What does it do? I mean, will the Pi be used to emulate 1MHz bus devices like hard discs, Teletext adapter, Music 500 etc?
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dp11
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

It doesn't do anything yet. But it should be possible to emulate 1MHz bus devices in the Pizero.
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hoglet
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Re: Raspberry Pi to 1MHz bus interface

Post by hoglet »

dp11 wrote:
Mon Oct 15, 2018 8:08 pm
It doesn't do anything yet. But it should be possible to emulate 1MHz bus devices in the Pizero.
This, of course, is left as an exercise for the interested reader. :lol:
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BeebMaster
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Re: Raspberry Pi to 1MHz bus interface

Post by BeebMaster »

Beyond me I think, but hopefully somebody will! And as a vote of confidence in the ability of others, put me down for 4 of the interfaces please!
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dp11
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

I do a few plans , but don't want to over sell it at this moment.
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IanB
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Re: Raspberry Pi to 1MHz bus interface

Post by IanB »

You do realise if we keep going on this way, the beeb will have a Raspberry Pi stuck in every port :lol:
Last edited by IanB on Mon Oct 15, 2018 10:02 pm, edited 1 time in total.
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BeebMaster
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Re: Raspberry Pi to 1MHz bus interface

Post by BeebMaster »

I'm sure a Raspberry Pi floppy disc is a possibility...
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Re: Raspberry Pi to 1MHz bus interface

Post by tom_seddon »

Sign me up for two please!

--Tom
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paulv
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Re: Raspberry Pi to 1MHz bus interface

Post by paulv »

BeebMaster wrote:
Mon Oct 15, 2018 10:14 pm
I'm sure a Raspberry Pi floppy disc is a possibility...
Technically, that's been done using Linux as a server on the Pi and a bit of custom jukebox server code with a hacked DFS and custom user port to USB cable that emulates a SCSI type system to pull data over the cable. IIRC.

It was done around the same time as UPURS and put out as an open source project so is entirely reproduceable.

TBF though a Gotek does a better "less fuss" job these days and leaves the user port free for other things.

Paul
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

PCBs are due back next week. I'm just about to buy the connectors etc . For an extra £2.00 I will supply all the bits except the cable and connector to get +5v to the board .
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Re: Raspberry Pi to 1MHz bus interface

Post by dominicbeesley »

One for me please too...
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Re: Raspberry Pi to 1MHz bus interface

Post by rharper »

OK, I'll try one please
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paulv
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Re: Raspberry Pi to 1MHz bus interface

Post by paulv »

dp11 wrote:
Sun Oct 28, 2018 4:25 pm
For an extra £2.00 I will supply all the bits except the cable and connector to get +5v to the board .
That sounds like a plan. :D I'll definitely take you up on this.

Paul
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Re: Raspberry Pi to 1MHz bus interface

Post by tricky »

I'll take a couple with bits please.
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Re: Raspberry Pi to 1MHz bus interface

Post by fordp »

A bit quiet round here #-o
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dp11
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

Sorry life has got in the way. 1st PCB assembled and tested on a Master. Code written to emulated Acorn Paged RAM expansion and http://www.sprow.co.uk/bbc/ramdisc.htm . I now have 16Mbytes on the 1MHz bus with a PiZero. :)
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fordp
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Re: Raspberry Pi to 1MHz bus interface

Post by fordp »

Sorry I just noticed this. Anything I can do to help, I have quite a few ideas for this board ;)
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dp11
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

Sorry for the delay. Lots of life got in the way.

I'm just getting ready to do a release.

Just to give you a hint of what is coming. The supported RAM via JIM is now 480MBytes ! hopefully that will be enough ( like 640K !) This RAM can also be preloaded from SDCARD.
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

Music 5000 is also now supported. Even plays through the Beebs internal speaker.

If you use a RPI3B+ you can use the headphone jack for audio and get 992Mbytes of RAM to play with.
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KenLowe
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Re: Raspberry Pi to 1MHz bus interface

Post by KenLowe »

If you've still got any spares, a couple of full kits is definitely something I'd be interested in.

Thanks
Ken.
Last edited by KenLowe on Thu Apr 11, 2019 8:56 pm, edited 1 time in total.
dp11
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Re: Raspberry Pi to 1MHz bus interface

Post by dp11 »

Now also emulates an ADFS harddisc. Read performance is about 100K/sec
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