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mac_via: update comment for VIA1B_vMystery bit 

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>
Message-Id: <20211020134131.4392-2-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mark Cave-Ayland 2021-10-20 14:41:24 +01:00 committed by Laurent Vivier
parent 50352cce13
commit e976459b3b
1 changed files with 4 additions and 0 deletions
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4
hw/misc/mac_via.c
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@ -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) */