ZN Final Bios board - Install guide

[Hammy]

As promised, the guide to install the bios board!

BIOS BOARD FINAL:

Same procedure for ZN1 or ZN2's:

1: Fit bios board to the connector at the back with pins or socket if you prefer.
2: Remove IC 353 of motherboard
3:Remove IC 652 of motherboard (fit a socket for later if you like)
4: Attach from J2 of the bios board to the following pin pads of IC353

BIOSJ2 -BOARD353
1- ---------- - Pin13
2- ---------- - Pin15
3- ---------- - Pin17
4- ---------- - Pin19
5- ---------- - Pin22
6- ---------- - Pin24
7- ---------- - Pin26
8- ---------- - Pin28
9- ---------- - Pin10

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5:
Bios rom used can be 27c400, 800 or 160

For 27c400 Pin 1 of the socket is empty and resistors / switch not fitted - you can load 1 bios.
Bypass capacitor optional but it's nice to have

For 27c800/160 switch and 2 10k resistors needs to be fitted - you can load 2-4 different bios on switch.
Bypass capacitor optional but it's nice to have

Done!

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DO NOT WIRE UP THE BACK CONNECTOR FOR V1 WITH THIS GUIDE, ASK ME ABOUT IT FIRST.
DO NOT USE BIOS V2 board (ask me for a replacement final ver if not already fitted...)
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Any questions about installing etc, please add below so it's all in one place

 

[AlxUnderBase]

Another great project by @Hammy & @caius

 

[Derick2k]

I think Hammy is going to need his own projects section Nice work buddy!

 

[Viku]

amazing! I'll try to do it soon with the help of @Tailsnic Retroworks !