Abbingdon Music Research AM-77 Reference Class - Manual (Page 19)

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3.9 RS232 Option Connector
At the rear of the AM-77, the RS232 connector (R9) allows the AM-77 to be upgraded. Please refer to Section 6
- Additional Connectivity for a detailed explanation.
3.10 Menu (RC-77 only)
The MENU button (RC1) will enter the Advanced Menu system of the AM-77. Please refer to Section 4 -
Advanced Features for a detailed explanation.
3.11 OK (RC-77 only)
The OK button on (RC7) the RC-77 is for the confirmation of a desired selection within the Advanced Menu
system of the AM-77. Please refer to Section 4 - Advanced Features for a detailed explanation.
3.12 Mute (RC-77 only)
The MUTE button (RC5) will disengage the volume of the AM-77 and re-engage the volume if it is pressed again.
3.13 Brightness (RC-77 only)
The BRIGHTNESS button (RC6) will adjust the display’s brightness at the front panel of the AM-77. There are 4
different brightness settings including display off.
With its own isolated power supply, with the display ON or OFF, there is no sonic impact upon the AM-77.