Discussion DreamCast R&D and Documenting

What are we?


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Nold

I just meme here
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Joined
Jul 16, 2017
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4 + 1*π
oh than one.. i thought you ment the e2 controller chip itself... anyways there is a pinout for your stuff in my two dc guides, too. :D
 

RDC

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Joined
Aug 23, 2016
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For disabling that 'protection circuit' in the DC, which just keep the OE of IC305 Hi so the clocks stay running. It's a thermal fuse in the VA0 and then the fan RPM signal in the VA1 and VA2.1 boards..

VA0 board, you can install a 1k at R345 (top side of board at CN301) or jumper it closed.

VA1 board, just put a 1k or so Resistor in the R627 spot (bottom of board around IC601) or just jumper it closed if you want. This makes IC601, R613, D605 and CE601 all pretty much useless and they can be removed if desired.

VA2.1 board, just about the same as the VA1, but IC601 is on the top side of the board, while R627 is on the bottom side of the board around the same area. Install a 1k or jumper it closed and no fan is needed.


Pinout for CN601 on the motherboards..

VA0

1 - GND
2 - 5v
3 - 5v
4 - 5v
5 - GND
6 - A0
7 - B0
8 - GND
9 - A1
10 - B1
11 - GND
12 - A2
13 - B3
14 - GND
15 - A3
16 - B3
17 - GND
18 - LED
19 - Batt VCC (for charging batt)
20 - Batt VCC

VA1 and VA2.1

1 - LED
2 - Batt VCC
3 - A0
4 - B0
5 - GND
6 - A1
7 - GND
8 - B1
9 - A2
10 - B2
11 - GND
12 - A3
13 - GND
14 - GND
15 - B3
16 - GND
17 - 5v
18 - 5v
19 - 5v
20 - Fan RPM
 

Nold

I just meme here
.
Joined
Jul 16, 2017
Messages
315
Likes
918
Location
EU
Portables
4 + 1*π
For disabling that 'protection circuit' in the DC, which just keep the OE of IC305 Hi so the clocks stay running. It's a thermal fuse in the VA0 and then the fan RPM signal in the VA1 and VA2.1 boards..

VA0 board, you can install a 1k at R345 (top side of board at CN301) or jumper it closed.

VA1 board, just put a 1k or so Resistor in the R627 spot (bottom of board around IC601) or just jumper it closed if you want. This makes IC601, R613, D605 and CE601 all pretty much useless and they can be removed if desired.

VA2.1 board, just about the same as the VA1, but IC601 is on the top side of the board, while R627 is on the bottom side of the board around the same area. Install a 1k or jumper it closed and no fan is needed.
Holy shit.. welcome - this is a damn nice first post! Hope there are much more to come! :)
 
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