[PATCH v2 1/8] mac_via: update comment for VIA1B_vMystery bit

[Mark Cave-Ayland]

According to both Linux and NetBSD, port B bit 6 is used on the Quadra 800 to
configure the GLUE logic in A/UX mode. Whilst the name VIA1B_vMystery isn't
particularly descriptive, the patch leaves this to ensure that the constants
in mac_via.c remain in sync with Linux's mac_via.h.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 hw/misc/mac_via.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index 993bac017d..7a53a8b4c0 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -130,6 +130,10 @@
                                 * On SE/30, vertical sync interrupt enable.
                                 * 0=enabled. This vSync interrupt shows up
                                 * as a slot $E interrupt.
+                                * On Quadra 800 this bit toggles A/UX mode 
which
+                                * configures the glue logic to deliver some 
IRQs
+                                * at different levels compared to a classic
+                                * Mac.
                                 */
 #define VIA1B_vADBS2   0x20    /* ADB state input bit 1 (unused on IIfx) */
 #define VIA1B_vADBS1   0x10    /* ADB state input bit 0 (unused on IIfx) */
-- 
2.20.1