From 8c7045a16a9ccff9e568c032db41a2237cd8b146 Mon Sep 17 00:00:00 2001 From: Lord-Nightmare Date: Fri, 17 Jun 2016 04:07:50 -0400 Subject: [PATCH] forgot this (n/w) --- src/mame/drivers/decwritr.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/mame/drivers/decwritr.cpp b/src/mame/drivers/decwritr.cpp index 51ead28b5cd..f82a6a6e647 100644 --- a/src/mame/drivers/decwritr.cpp +++ b/src/mame/drivers/decwritr.cpp @@ -170,7 +170,7 @@ READ8_MEMBER( decwriter_state::la120_DC305_r ) 2 = ? 3 = ? there are at least two bits in here to enable the 2.5ms tick interrupt(rst3) and the dot interrupt/linefeed(rtc expired) interrupt(rst5) - the dot fifo is 4 bytes long, dot int fires when it is empty + the dot fifo is 4 bytes long, dot int fires when it is half empty at least 3 bits control the speaker/buzzer which can be on or off, at least two volume levels, and at least two frequencies, 400hz or 2400hz two quadrature lines from the head servomotor connect here to allow the dc305 to determine motor position; one pulses when the motor turns clockwise and one when it turns counterclockwise. the head stop is found when the pulses stop, which firmware uses to find the zero position. */