As requested I took some pictures building the Mark 2 of these adapters so anyone interested could put them together
Parts:
Chepo 80Pin SCA to 50 Pin adapter (http://www.ebay.co.uk/itm/130772715339)
18x 110ohm resistors, i suggest you use 1/8 watt or you will be pushed for space (1/4 should just about be ok) (http://cpc.farnell.com/_/mf25-110r/resistor-0-25w-1-110r/dp/RE03728)
OR 110 Ohm resistor packs pulled from dead drives
1x 1N4001 diode (or anything similar) if your adapter doesn't have a diode on it already you will need 2 (though i haven't seen any without it)
1x Small electrolytic cap (I used a 10uF non polarized one, any small value should work, and it dosen't need to be NP, just the ones i have are)
Total cost of the parts should be under £2
This adapter just terminates the lines on the 50 pin connector, it will not help with any fussy SCA drives that want their extra data lines terminated.
First thing is to solder the 110 ohm resistors, Connect all the tops of them together:
Then the cap, which goes between the the common contact of the resistors and ground, i find the best thing is to fold the legs other tho the other side of the board:
And finally, solder the diode between the side of the term power jumper closest to the edge of the board and the common contact of the resistors. Cathode towards the resistors.
Also I recommend you cut the trace going from the term power to the 50 pin connector, otherwise you may find in some macs you cannot switch off termination.
Installed and it works
Parts:
Chepo 80Pin SCA to 50 Pin adapter (http://www.ebay.co.uk/itm/130772715339)
18x 110ohm resistors, i suggest you use 1/8 watt or you will be pushed for space (1/4 should just about be ok) (http://cpc.farnell.com/_/mf25-110r/resistor-0-25w-1-110r/dp/RE03728)
OR 110 Ohm resistor packs pulled from dead drives
1x 1N4001 diode (or anything similar) if your adapter doesn't have a diode on it already you will need 2 (though i haven't seen any without it)
1x Small electrolytic cap (I used a 10uF non polarized one, any small value should work, and it dosen't need to be NP, just the ones i have are)
Total cost of the parts should be under £2
This adapter just terminates the lines on the 50 pin connector, it will not help with any fussy SCA drives that want their extra data lines terminated.
First thing is to solder the 110 ohm resistors, Connect all the tops of them together:
Then the cap, which goes between the the common contact of the resistors and ground, i find the best thing is to fold the legs other tho the other side of the board:
And finally, solder the diode between the side of the term power jumper closest to the edge of the board and the common contact of the resistors. Cathode towards the resistors.
Also I recommend you cut the trace going from the term power to the 50 pin connector, otherwise you may find in some macs you cannot switch off termination.
Installed and it works
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