From ff45ded923c4124294db1e764846be566391c9a1 Mon Sep 17 00:00:00 2001 From: Lord-Nightmare Date: Thu, 23 Jul 2015 14:06:36 -0400 Subject: [PATCH] VK100: Fix diagrams for memory map decoding in comments, based on schematics. [Lord Nightmare] --- src/mess/drivers/vk100.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/src/mess/drivers/vk100.c b/src/mess/drivers/vk100.c index a378ffacf11..a066121fd27 100644 --- a/src/mess/drivers/vk100.c +++ b/src/mess/drivers/vk100.c @@ -690,13 +690,13 @@ ADDRESS_MAP_END * (a15 to a8 are latched the same value as a7-a0 on the 8080 and 8085) * [this map is derived from extensive tracing as well as some guesswork, noted for the crtc, systat_b and the uart] a7 a6 a5 a4 a3 a2 a1 a0 - ?x 0 ?x ?x ?x ?x ?x 0 W CRTC address - ?x 0 ?x ?x ?x ?x ?x 1 RW CRTC register r/w + x 0 x x x x x 0 W CRTC address + x 0 x x x x x 1 RW CRTC register r/w x 1 * * * ** ** ** read area (rightmost 74ls138): x 1 0 0 0 * * * R SYSTAT_A (a0-a3 chooses the bit of the dipswitches read via d3) - x 1 0 0 1 ?x ?x ?x R SYSTAT_B - x 1 0 1 0 ?x ?x 0 R i8251 UART data - x 1 0 1 0 ?x ?x 1 R i8251 UART status + x 1 0 0 1 x x x R SYSTAT_B + x 1 0 1 0 x x 0 R i8251 UART data + x 1 0 1 0 x x 1 R i8251 UART status x 1 0 1 1 x x x R unused x 1 1 0 0 x x x R unused x 1 1 0 1 x x x R unused @@ -720,10 +720,10 @@ ADDRESS_MAP_END x 1 1 0 0 1 * * W set VG_MODE to * * XOR 3 and Execute (if GO is not active) x 1 1 0 1 0 x x W KYBDW x 1 1 0 1 1 x x W BAUD - x 1 1 1 0 0 ?x 0 W i8251 UART data - x 1 1 1 0 0 ?x 1 W i8251 UART control + x 1 1 1 0 0 x 0 W i8251 UART data + x 1 1 1 0 0 x 1 W i8251 UART control x 1 1 1 0 1 x x W unused - x 1 1 1 1 0 x x W unused? (may be wired-or to KYBDW) + x 1 1 1 1 0 x x W unused x 1 1 1 1 1 x x W unused */ static ADDRESS_MAP_START(vk100_io, AS_IO, 8, vk100_state)