Analogue-sequencer

>----- Oorspronkelijk bericht -----
>Van: Colin Fraser [mailto:colin@sequentix.com]
>Verzonden: vrijdag, juni 15, 2007 12:11 AM
>Aan: analogue-sequencer@yahoogroups.com
>Onderwerp: [analogue-sequencer] P3 v4 memory expansion
>
>Folks,
>
>One of the things that became clear from developing the v3 to v4 conversion
>utility (download coming soon), is that by re-using the patterns in
>different orders in many playlists, it's possible to create a bank in v3
>that uses quite a bit more storage space in v4.
>If every bank re-uses patterns in this way (now known as 'Nagling'), it can
>be impossible to fit a converted v3 dump in v4, even using ghosting where
>ever possible.
>
>Since v4 was developed as a test-bed for the P3 replacement hardware
>platform, it was designed for scalable memory.
>I've just completed a prototype memory expansion board for P3, which
>increases the internal RAM from 64k to 544k.
>Note that this board is only compatible with v4.
>It uses bank switching to give a dedicated 224 bars of pattern storage per
>v4 bank - still dynamically allocated between tracks and parts.
>This is rather more than the average 24 bars per bank in the stock P3 -
>3,200 extra bars in total, on top of the standard 384.
>
>If you've been using v4, and would like to buy a memory expansion board, let
>me know.
>I'll be finishing off a PCB layout shortly and ordering a run of boards.
>Installation will just be a case of unplugging the 32k SRAM in U2, and
>replacing it with a daughterboard.
>
>The prototype can be seen here:
>http://www.sequentix.com/p3-half-meg-memex.jpg
>
>Best regards,
>Colin Fraser
>Sequentix Music Systems Ltd
>http://www.sequentix.com
>
>
>