Add MASTER I/O Versions

[eclab]

The Master I/O page needs discussion of its various versions. Below is what I know about them, but it is incomplete in several places:

• I do not know if R3 had the adjustable trimpot or not (Robert, bring the trimpot back!)
• I know that somewhere in the R2 or R3 timeframe there were significant changes internally to the CPU design
• I do not know when the EURORACK header was added
• If I recall correctly, the additional power header was removed in R4? Maybe R3? But Robert offered to solder one on for me.

Here's what I'd add (hopefully agumented with answers to the stuff above).

Versions

MASTER I/O has had 5 versions to date: the original, and revisions R2, R3, R4, and R5. Later versions have better MIDI handling and accuracy internally, internally. Additionally, later versions have had additional features as described below.

Original MASTER I/O

• MIDI In Channels: 1 or OMNI
• Sockets: AUDIO 1, AUDIO 2, CTRL 1, CTRL 2
• Power outlet on side of panel
• High rail (5V) power voltage adjustable by trimpot

R2

• MIDI In Channels: 1 or OMNI
• Sockets: AUDIO 1, AUDIO 2, CTRL 1, CTRL 2, BUS CV, BUS CV, BUS GATE, BUS CTRL
• Legato option
• Power outlet on side of panel
• High rail (5V) power voltage adjustable by trimpot

R3

• MIDI In Channels: 1 or OMNI
• Sockets: AUDIO 1, AUDIO 2, CTRL 1, CTRL 2, BUS CV, BUS CV, BUS GATE, BUS GATE, BUS CTRL, BUS CTRL, +5V, +5V, GND, B.CLOCK, B.START, B.STOP
• Legato option
• Power outlet on front of panel

R4

• MIDI In Channels: 1, 14, 15, 16, selectable by jumper, or OMNI
• Sockets: AUDIO 1, AUDIO 2, CTRL 1, CTRL 2, BUS CV, BUS CV, BUS GATE, BUS GATE, BUS CTRL, BUS CTRL, +5V, +5V, GND, B.CLOCK, B.START, B.STOP
• Legato option
• Power outlet on front of panel

R5

• MIDI In Channels: 1, 14, 15, 16, selectable by switch, or OMNI
• Sockets: AUDIO 1, AUDIO 2, CTRL 1, CTRL 2, BUS CV, BUS CV, BUS GATE, BUS GATE, BUS CTRL, BUS CTRL, +5V, +5V, GND, B.CLOCK, B.START, B.STOP
• Legato option
• Power outlet on front of panel
• Connections to bus (CV, GATE, CTRL, START, STOP, CLOCK) can be disconnected with switches