logajan@ns.network.com (John Logajan) (03/28/91)
Okay, I admit not paying attention the last ten times this was discussed, but: If I disable interrupts (set SR to $2700) but don't shut down the keyboard ACIA (don't send $13 to $fffc02) then I can get the ACIA into a weird state if I hit a key on the keyboard while the interrupts are still off. Whatever was the first key pressed in this state will continue to be presented from the ACIA after interrupts are turned on again (set SR to $2300). The ACIA seemingly spits out that "stuck" character every half second or so, and will continue to do so until another key on the keyboard is hit. The other way I have found to "kill the phantom" is to send the reset command to the ACIA ( $3 to $fffc00 then $96 to $fffc00) just before I turn interrupts back on. Could this be the phantom typist? -- - John Logajan @ Network Systems; 7600 Boone Ave; Brooklyn Park, MN 55428 - logajan@ns.network.com, 612-424-4888, Fax 612-424-2853