From 3d32ab63d469e31d3fa5ae4c82b6dee70be62f6f Mon Sep 17 00:00:00 2001 From: AJR Date: Wed, 22 Nov 2017 14:58:39 -0500 Subject: mc68681: Note on model differences (nw) --- src/devices/machine/mc68681.cpp | 6 ++++++ 1 file changed, 6 insertions(+) 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" -- cgit v1.2.3