How to connect a PC drive to a Sanyo Wavy
(Spanish and english version)
External connection of 3" drive to SVI 738
Ivan (Ivisoft)
Converted to PDF by HansO, 2003
How to connect a PC drive to a Sanyo Wavy (english version)
PC 5,25/3,5"
Sanyo Wavy 70FD
NAME
----------------------------------------2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NC
NC
NC
8
10
12
NC
16
18
20
22
24
26
28
30
32
34
--------- RESERVED
--------- RESERVED
-- /DRIVE SELECT 3
----------- /INDEX
-- /DRIVE SELECT 0
-- /DRIVE SELECT 1
-- /DRIVE SELECT 2
-------- /MOTOR ON
-------- DIRECTION
------------ /STEP
------- WRITE DATA
------ /WRITE GATE
--------- /TRACK 0
--- /WRITE PROTECT
-------- READ DATA
----- /SIDE SELECT
------------ READY
How to connect a PC drive to a Sanyo Wavy (english version)
PC 5,25/3,5"
Sanyo Wavy 70FD
NAME
----------------------------------------2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
NC
NC
NC
8
10
12
NC
16
18
20
22
24
26
28
30
32
34
--------- RESERVED
--------- RESERVED
-- /DRIVE SELECT 3
----------- /INDEX
-- /DRIVE SELECT 0
-- /DRIVE SELECT 1
-- /DRIVE SELECT 2
-------- /MOTOR ON
-------- DIRECTION
------------ /STEP
------- WRITE DATA
------ /WRITE GATE
--------- /TRACK 0
--- /WRITE PROTECT
-------- READ DATA
----- /SIDE SELECT
------------ READY
Power connector (see below):
PC
Wavy
NAME
COLOUR
----------------------------1 ---- ? ---- +5V ---- RED
2 ---- ? ---- GND -- BLACK
3 ---- ? ---- GND -- BLACK
4 ---- ? --- +12V - YELLOW
NOTICE that odd pins on PC drive are ground (GND).
Pins 2,4,6,14 are not used on PC 720K drive. MSX uses pins 6,14 for DRIVE SELECT 3 and 2.
Wavy does not use pins 1,2,3,4,5,6,14,29,31,33 and pins 7,9,11 are +5V.
Leave them disconnected from drive. To get power from them, get a power connector and connect pin 1 (red cable) to one of
them.
Pins 2,3 (GND) have to be connected to any odd pin (i.e. 13)
As Wavy board does not deliver +12V, you have to decide what to do:
Connect drive without +12V and try to make it work (some drives does not need +12V) or get +12V somewhere in the board,
directly from power suply or from pin 48 in cartdrige connector. Use a voltimeter to make sure you connecto to +12V. Always
disconnect your MSX from power outlet before soldering.
Bear in mind that a drive for PC comes "de-facto" configured as SECONDARY (disk select 1).
If you want it to work as PRIMARY and haven't got any jumper, you will have to swap cables 10 and 12 or connect pin 10 (from
MSX) to 12 (drive)
How to make the whole adaption
Have a 34 pin cable. Be sure that cables 10-16 are not crossed over. If
so, better disarm
cable and make them straight.
Cable 1 is red or blue.
Changes have to be done only in one edge. In the other, the one for
MSX, no changes are
needed.
- Cut down following cables near drive connector (1 or 2 centimeters
far is enough)
1,3,5,7,9,11,29,31,33
- Peel off cable 15 (or cut it and solder later if you want).
- Join cables you cut before (1,3,5,7,9,11,29,31,33) to 13 or 27 on
short side (drive).
- Get a power cable and solder pin 1 (red) to 7 or 9 or 11, on long
side (MSX).
- Solder power connector pin 2,3 to any odd pin on short side
(drive).
- As an option, you can get +12 from pin 48 of cartdrige connector.
Next, depending on the drive you are using you will have to make
folowing change:
- If your drive works as secondary (B:), you will need to swap cables
10 and 12.
If you are not sure of what kind of drive you are using, you can make
the following:
- You will need 3 pins and a jumper.
- Cut cable 10 and 12 (aprox 2 cms from connector).
- Solder center pin to cable 10 on MSX side (long side).
- Solder one edge pin to cable 12 on short side (drive).
- On the other pin, solder cable 10 on short side (drive).
Now you can set jumper to select drive number (primary or secondary)
If the drive work properly but, when a disk is read you only get errors
and all disks
fail to boot, try to disconnect cable 34 from drive (leave this pin
unconnected) and
connect it to ground (odd pin). You can also do the next:
- Disconnect cable 34 from drive.
- Solder 3 pins and add a jumper
- pin 34 MSX (one side)
- pin 34 DRIVE (centre)
- GND (other side)
External connection of 3" drive to SVI 738
3" drive
PC 5,25/3,5"
SVI 3,5" (DB25F)
NAME
--------------------------------------------------------------1 --------------- 7 -------------- 20-25 ------------- GND
2 --------------- 8 -------------- 4
----------- /INDEX
3 --------------- 9 -------------- 20-25 -------------- GND
4 --------------- 10 -------------- 17
-- /DRIVE SELECT 0
5 --------------- 11 -------------- 20-25 -------------- GND
6 --------------- 12 -------------- 5
-- /DRIVE SELECT 1
7 --------------- 15 -------------- 20-25 -------------- GND
8 --------------- 16 -------------- 18
-------- /MOTOR ON
9 --------------- 17 -------------- 20-25 -------------- GND
10 --------------- 18 -------------- 6
-------- DIRECTION
11 --------------- 19 -------------- 20-25 -------------- GND
12 --------------- 20 -------------- 7
------------ /STEP
13 --------------- 21 -------------- 20-25 -------------- GND
14 --------------- 22 -------------- 8
------- WRITE DATA
15 --------------- 23 -------------- 20-25 -------------- GND
16 --------------- 24 -------------- 9
------ /WRITE GATE
17 --------------- 25 -------------- 20-25 -------------- GND
18
19
20
21
22
23
24
25
26
-------------------------------------------------------------------------------------------------------------------------------
26
27
28
29
30
31
32
33
34
2
-----------------------------------------------------------------------------------------------------------------------------------
10
--------- /TRACK 0
20-25 -------------- GND
11
--- /WRITE PROTECT
20-25 -------------- GND
12
-------- READ DATA
20-25 -------------- GND
13
----- /SIDE SELECT
20-25 -------------- GND
19
------------ READY
RESERVED (DO NOT USE)
NOTE all odd pins on both 3" and PC 3,5" are GND
You have to be aware of the drive config, that is, if the drive you are using was working as drive A or B. If it is an A drive, it
would not work as drive B and, if it is a B drive, may be not work as A drive. If you want 3" drive to work as secondary drive
(configured as A drive), just swap pins 4 and 6, or connect pin 6 where 4 should be and leave 4 disconnected. If it is a B drive
and want to act as A drive, swap same pins.
DC Power connector:
3"
PC
SVI
NAME
--------------------------1 ---- 4 ---- 1 ---- +12V
2 ---- 3 ---- 20-25 -- GND
3 ---- 2 ---- 20-25 -- GND
4 ---- 1 ---- 2 ----- +5V">