HwB: MSX Expansion Connector

MSX Expansion

49 47 45   5 3 1
+---------//-----+
| H H H  //H H H |
| ======//====== |
| H H H//  H H H |
+-----//---------+
 50 48 46  6 4 2

UNKNOWN (At the Computer)

50 PIN ?? at the Computer.

Pin	Name	Dir	Description
1	/CS1		Memory Read in addresses 4000-7FFF
2	/CS2		Memory Read in addresses 8000-BFFF
3	/CS12		Memory Read in addresses 4000-BFFF
4	/SLTSL		Low when Slot 2 (cartridge slot) is selected
5	n/c	-	Not connected.
6	/RFSH		Refresh signal from CPU
7	/WAIT		OC, Tells CPU to wait. Refresh signal is not maintained
8	/INT		OC, Requests a interrupt to CPU (call to addr 38h)
9	/M1		CPU fetches first part of instruction from memory.
10	/BUSDIR		NC, was used to control the data direction.
11	/IORQ		I/O request signal. (Address=Port)
12	/MREQ		Memory request signal. (Address=Address)
13	/WR		Write signal (strobe)
14	/RD		Read signal (strobe)
15	/RESET		Reset
16	n/c	-	Not connected.
17	A0		Address 0
18	A1		Address 1
19	A2		Address 2
20	A3		Address 3
21	A4		Address 4
22	A5		Address 5
23	A6		Address 6
24	A7		Address 7
25	A8		Address 8
26	A9		Address 9
27	A10		Address 10
28	A11		Address 11
29	A12		Address 12
30	A13		Address 13
31	A14		Address 14
32	A15		Address 15
33	D0		Data 0
34	D1		Data 1
35	D2		Data 2
36	D3		Data 3
37	D4		Data 4
38	D5		Data 5
39	D6		Data 6
40	D7		Data 7
41	GND		Ground
42	CLOCK		CPU clock, 3.579 MHz
43	GND		Ground
44	SW1	-	NC, Insert/remove detection for protection
45	+5V		+5 VDC (300mA max /slot)
46	SW2	-	NC, Insert/remove detection for protection
47	+5V		+5 VDC (300mA max /slot)
48	+12V		+12 VDC (50mA max /slot)
49	SOUNDIN		Sound input (-5dBm)
50	-12V		-12 VDC (50mA max /slot)

Note: Direction is Computer relative Peripheral.

Contributor: Joakim Цgren

Please send any comments to Joakim Цgren.