Date   : Sun, 27 Apr 1997 17:00:01 +0100
From   : Martin Main <mmain@...>
Subject: Newbie question

Hi,

I have recently purchased a BBC Model B with disk drive and although I have 
worked with these machines it was about 12 years ago.

The machine appears to have OS Version 1.2, View version A3.0 and DFS 1.2.

I was trying to find out what version of Basic was installed (still have 
been unable to figure this out) and opened the machine up to have a look at 
the ROM's. On the right hand side where the ROM's reside a small board has 
been installed which is some form of expansion board. However, on this 
board is a small encapsulated device (ROM footprint size) which has wires 
running off to an externally mounted toggle switch. There are also a pair 
of wires running off to the main board via test type connectors (i.e. non 
soldered) These wires run to a pin on an 74LS00 and to a pin on the ADC 
chip.

Can anyone help enlighten me to the function of the board and this device?

Thanks in advance,

Martin Main