M.I.D.I. MERGE 'HUB'.

An other project in progress :

M.I.D.I. MERGE HUB

• Easy to use two input merged ports towards six output ports.
• One output replica port for one of the input port. 
• Small form factor with 3,5mm jack connectors.
• Single USB mini power port.

M.I.D.I. to CV/GATE

An other project in progress :

M.I.D.I. to CV/GATE interface

• M.I.D.I. channels : 1 to 8 OR 9 to 16.
• GATE : 5V.
• CV : 4 x (0V to 5V) and 4 x (0V to 10V).
• CONNECTOR : 3,5mm jacks.

SRAM select command.

My system of SRAM bank selection in on the way...

This system selects one of the memory banks installed inside a synthesizer. It will remain outside the synthesizer and will be connected to the internal memory using a connector placed on the instrument case.

In addition, a MIDI connection will allow the automatic selection of the bank, in relation to the desired patch. So it will not be necessary to modify the synthesizer motherboard in any way.

This system makes it possible to manually modify the memory bank, as well as the MIDI channel for receiving the MIDI bank change information. The MIDI channel and the number of the last bank used will be saved.

this system should also be a better bank change solution for my Prophet VS, compared to the previous system :

THE NEWS

This last month, two prototypes were made. A circuit compatible with the 16550 UART and a self-saved 16 x 6116 SRAM circuit :

The 16550 compatible UART is partially tested. Its usb interface is fully functional. This '16550' offers two identical serial interfaces. One of them can be used in TTL or with a RS232C level converters as usual, the other is directly connected to the on board USB interface. It would be easier to communicate to vintage computer with this solution, as with my hold Z80 N8VEM board : 

On my N8VEM I haven't yet the 1,8432MHz oscillator, as in this picture.

The 16 x 6116 equivalent self-saved SRAM is tested. It's basically the same system as my previous self-saved 6116 solution : 

the hold version.

BUT, now it's possible to select ALL the sixteen 2Kb space. I work on an easy-to-use bank selector...