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-rw-r--r--src/devices/machine/mc68681.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/devices/machine/mc68681.cpp b/src/devices/machine/mc68681.cpp
index 720e20bddcd..5b5d67aca92 100644
--- a/src/devices/machine/mc68681.cpp
+++ b/src/devices/machine/mc68681.cpp
@@ -11,6 +11,12 @@
Improved interrupt handling by R. Belmont
Rewrite and modernization in progress by R. Belmont
Addition of the duart compatible 68340 serial module support by Edstrom
+
+ The main incompatibility between the 2681 and 68681 (Signetics and Motorola each
+ manufactured both versions of the chip) is that the 68681 has a R/W input and
+ generates a 68000-compatible DTACK signal, instead of using generic RD and WR
+ strobes as the 2681 does. The 68681 also adds a programmable interrupt vector,
+ with an IACK input replacing IP6.
*/
#include "emu.h"