RS-232 note (nw)

2025-04-22 16:31:49 +03:00 · 2018-01-21 01:25:32 -05:00 · 2018-01-21 01:25:32 -05:00 · 36f5cc9185
commit 36f5cc9185
parent 4e64f95721
1 changed files with 3 additions and 0 deletions
--- a/src/devices/bus/rs232/rs232.cpp
+++ b/src/devices/bus/rs232/rs232.cpp
@ -32,6 +32,9 @@
    DTE →   21          RL  Remote Loopback
    ← DCE   25          TM  Test Mode

+    Mark (logic 1) = typically -12V (-3V maximum, -15V minimum)
+    Space (logic 0) = typically +12V (+3V minimum, +15V maximum)
+
 ***************************************************************************/

 #include "emu.h"