Date   : Wed, 30 Jun 2010 23:21:28 +0100
From   : pete@... (Pete Turnbull)
Subject: BBC Master Compact key ghosting

On 30/06/2010 22:08, J.G.Harston wrote:

> See the commented OS 1.20 disassembley at http://mdfs.net/Docs/Comp/BBC/OS1-20
> The code in the BBC MOS from &EF02 onwards shows how the firmware
> interrogates the keybaord and deals with n-key rollover and elimiating
> ghosting. The code from EF16 to EF4D is called on the keyboard timer
> interupt to check for continued and further keypresses.

I expect that's just a typo, but it's 2-key rollover and n-key lockout.

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York