MSX Expansion

From HwB

Pinout

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.png

50 PIN ?? at the Computer.

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

Note: Direction is Computer relative Peripheral.

Contributions

Sources

  • Mayer's SV738 X'press I/O map