From 835e7e4462e2f38ff34ea420d57e882dcdb98140 Mon Sep 17 00:00:00 2001 From: Vas Crabb Date: Mon, 20 May 2024 19:46:53 +1000 Subject: bus/kim1: Added pinouts for the main variants of the "6502 local bus" to comment. --- src/devices/bus/kim1/kim1bus.h | 77 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) diff --git a/src/devices/bus/kim1/kim1bus.h b/src/devices/bus/kim1/kim1bus.h index 2512654c196..2fa57a2096d 100644 --- a/src/devices/bus/kim1/kim1bus.h +++ b/src/devices/bus/kim1/kim1bus.h @@ -4,6 +4,83 @@ kim1bus.h - KIM-1 expansion bus + Basically 6502 bus brought out to a connector. + + 44-pin edge connector, 1-22 on top, A-Z on bottom + + SYNC 1 A AB0 + /RDY 2 B AB1 + clock phase 1 3 C AB2 + /IRQ 4 D AB3 + RO 5 E AB4 + /NMI 6 F AB5 + /RES 7 H AB6 + DB7 8 J AB7 + DB6 9 K AB8 + DB5 10 L AB9 + DB4 11 M AB10 + DB3 12 N AB11 + DB2 13 P AB12 + DB1 14 R AB13 + DB0 15 S AB14 + K6 16 T AB15 + SST out 17 U clock phase 2 + N/C 18 V R/W + N/C 19 W inverted R/W + N/C 20 X PLL test + VCC 21 Y inverted clock phase 2 + GND 22 Z RAM R/W + + * RO is connected to 6502 SO pin + * K6 is asserted (low) when accessing 0x1800-0x1bff (mirror 0xe000) + + Rockwell AIM65 expansion only differs in five pins: + + -12V 16 + +12V 17 + /CS8 18 + /CS9 19 + /CSA 20 + + Comelta DRAC-1 expansion modules use a 64-pin edge connector with an + external manual reset input and more power rails, but without some + control signals: + + +25V a 1 c +25V + external manual reset a 2 c reserved + reserved a 3 c +5V battery + +12V a 4 c +15V + -5V a 5 c -15V/-12V + +5V a 6 c +5V + GND a 7 c GND + GND a 8 c GND + N/C a 9 c N/C + N/C a 10 c N/C + N/C a 11 c N/C + N/C a 12 c N/C + reserved a 13 c SYNC + reserved a 14 c reserved + R/W a 15 c /RDY + clock phase 2 a 16 c clock phase 1 + /IRQ a 17 c reserved + /NMI a 18 c /RES + reserved a 19 c reserved + DB7 a 20 c DB6 + DB5 a 21 c DB4 + DB3 a 22 c DB2 + DB1 a 23 c DB0 + reserved a 24 c reserved + AB15 a 25 c AB14 + AB13 a 26 c AB12 + AB11 a 27 c AB10 + AB9 a 28 c AB8 + AB7 a 29 c AB6 + AB5 a 30 c AB4 + AB3 a 31 c AB2 + AB1 a 32 c AB0 + + * No RO, RAM R/W, inverted clock phase 2 and R/W, K6 or SST out + ***************************************************************************/ #ifndef MAME_BUS_KIM1_KIM1BUS_H -- cgit v1.2.3