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View Full Version : MMBEEB interface in progress....



andyt31
April 16th, 2009, 01:50 AM
Ive finally started my MMBEEB interface. This will allow me to load games on the BBC Model B from a SD card.

Here are some pics of the work in progress.

Back - http://www.flickr.com/photos/andysretrocomputers/3445112527/
Front - http://www.flickr.com/photos/andysretrocomputers/3445927624/

Im hoping to finish it tonight. Just the EPROM to burn, and to put the cable on that links the reader to the beeb's user port.

There is more info on the build on my website, http://retrocomputers.wordpress.com

carlsson
April 16th, 2009, 07:25 AM
Looking cool. I never got the interface I put together 1-2 years ago to work, but some day I'll try the updated (simplified) design. You mention the voltage regulator hard to find, is it a very special kind or would any regulator bringing 5V down to 3.3V work?

By the way, Charlie is a member of this forum too. His username is SirMorris if I recall correctly.

andyt31
April 16th, 2009, 07:43 AM
You mention the voltage regulator hard to find, is it a very special kind or would any regulator bringing 5V down to 3.3V work?

I removed a 3.3v regulator from a dodgy Vibra 16 soundcard in the end, so no cost.

You can find the reccomended regulators in the UK, but it normally involves a minimum order.

Should have the interface completed tonight! :D

vk4akp
July 4th, 2009, 07:31 AM
Hi guys, can you tell me more about this please?

We have a BBC B here that we would dearly like to get going for our displays.

We'd love to convert a 1.2MB HD 5.25" drive if that's possible or buy a cheap 5.25" drive and also add some sort of SD card storage system too if that's possible.

Our groups main goals are to help save computing history by archiving as much software as we can using Catweasel etc, and also to find and restore / display old computers or re-home where ever possible.

~Ken~
Sj of ~The RCC (Retro Computing Cult).~
http://shazam.zapto.org
.-.-.

carlsson
July 5th, 2009, 10:54 AM
I believe 1.2MB is out of the question. However if your BBC computer has a FDC interface (8271 or 1770), you can connect a 3.5" drive, see Sprow's BBC page (http://www.sprow.co.uk/bbc/floppydrives.htm).

The mmbeeb SD interface should also be quite straightforward. You will need to be able to burn your own EPROMs, but I suppose any user group worth its salt already have those facilities.