Expansion board for the CD32 - Page 88

supaduper · 22 September 2017, 15:35

Quote:

Originally Posted by kipper2k

here is the picture to show where to insert the diodes (3 required), cathode (white line) closest to the RAM. cut and insert the diode where i marked with yellow circle.

Before someone corrects me, you can simply cut the track in the left hand circle as power is coming in from the top right.

Edit, i cleaned it up a bit. Red lines indicate traces on top, Blue on the bottom

In theory, any future updates of this board can have a 0 ohm resistor on the main 5v rail for those boards that require it for 5v ram, and you could swap out the 0 ohm resistor for a diode for those boards using 3.3v ram as the remainder of the board uses 3.3v. I think the CF card would get along fine with 4.6v

Awesome thanks Brian

RE: 3v samsung end of day 4 lol...I think Duracell made these Ram chips not Samsung

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** Edit has Steve caught me up yet

1K reached

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alenppc · 22 September 2017, 15:37

@supaduper that is looking very decent, I am starting to wonder whether I should just get those damn Samsungs - still no news from UTsource regarding the AS4C1M16E5-60TC. Been a week now.

supaduper · 22 September 2017, 15:44

Quote:

Originally Posted by alenppc

@supaduper that is looking very decent, I am starting to wonder whether I should just get those damn Samsungs - still no news from UTsource regarding the AS4C1M16E5-60TC. Been a week now.

Alen just buy them, trust me they are good to go

Yeah I am waiting on a couple of those to try from utsource ,longest I`ve waited yet for anything from them

cip060 · 22 September 2017, 17:33

kipper you have a private message please reply

solidcore · 22 September 2017, 18:26

@brian thanks for correcting the mistake mate, much appreciated

plasmab · 22 September 2017, 18:35

running a live stream of systest with the Samsung ram over on Terrible Fire 2.

kipper2k · 22 September 2017, 18:36

Quote:

Originally Posted by cip060

kipper you have a private message please reply

replied.

supaduper · 22 September 2017, 18:40

Quote:

Originally Posted by plasmab

running a live stream of systest with the Samsung ram over on Terrible Fire 2.

LoL where is it Steve cant find it

plasmab · 22 September 2017, 18:45

Quote:

Originally Posted by supaduper

LoL where is it Steve cant find it

[ Show youtube player ]

supaduper · 22 September 2017, 18:47

Cheers , mine is nearly a 1000 rounds steve

plasmab · 22 September 2017, 18:52

Only one TF328 board left :/ yikes

Sent from my iPhone using Tapatalk

plasmab · 22 September 2017, 19:07

All gone:/

Sent from my iPhone using Tapatalk

kipper2k · 22 September 2017, 19:41

i just looked at some alternate through hole diodes, here is a page of them.

https://www.digikey.ca/products/en/d...=0&pageSize=25

this is my favourite...
497-2512-1-ND

so for a multi voltage board you can bridge the rail with this or a 0 ohm resistor

mattymuc · 22 September 2017, 20:17

Quote:

Originally Posted by kipper2k

this is my favourite...
497-2512-1-ND
resistor

Isn't it better to not use SCHOTTKY diodes because SCHOTTKY diodes have a lower voltage drop?

plasmab · 22 September 2017, 20:18

Quote:

Originally Posted by mattymuc

Isn't it better to not use SCHOTTKY diodes because SCHOTTKY diodes have a lower voltage drop?

Thats why we want them.

you want 0.4-0.5V drop. To balance the RAM needs vs the CF/IDE Drive needs

kipper2k · 22 September 2017, 21:25

just an update, i finished the routing, it has to be a 4 layer board hopefully that will be a plus, we'll see, now is the time where i spend hours looking for the obvious mistakes that take forever to find.

FREEMILK · 22 September 2017, 21:42

very nice, this will be a hit i am sure.

plasmab · 22 September 2017, 23:36

Quote:

Originally Posted by supaduper

Awesome thanks Brian

RE: 3v samsung end of day 4 lol...I think Duracell made these Ram chips not Samsung

Attachment 54706

** Edit has Steve caught me up yet

1K reached

Attachment 54707

230 rounds here with the 3.3V ram. will let it go all night.

S

Cylon · 23 September 2017, 00:34

@kipper2k
Doesn't you need at least one of the CPLDs to cope with the IDE?

kipper2k · 23 September 2017, 01:07

Quote:

Originally Posted by Cylon

@kipper2k
Doesn't you need at least one of the CPLDs to cope with the IDE?

i hid them on the bottom

22 September 2017, 19:41	#1753
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	i just looked at some alternate through hole diodes, here is a page of them. https://www.digikey.ca/products/en/d...=0&pageSize=25 this is my favourite... 497-2512-1-ND so for a multi voltage board you can bridge the rail with this or a 0 ohm resistor Last edited by kipper2k; 22 September 2017 at 19:56.

22 September 2017, 21:42	#1757
FREEMILK Registered User Join Date: Jan 2016 Location: North Bay, Ontario, Canada Posts: 67	very nice very nice, this will be a hit i am sure.

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22 September 2017, 15:37	#1742
alenppc Registered User Join Date: Apr 2012 Location: Canada Age: 44 Posts: 910	@supaduper that is looking very decent, I am starting to wonder whether I should just get those damn Samsungs - still no news from UTsource regarding the AS4C1M16E5-60TC. Been a week now.

22 September 2017, 17:33	#1744
cip060 Registered User Join Date: Dec 2016 Location: Treviso ITALIA Posts: 81	kipper you have a private message please reply

22 September 2017, 18:26	#1745
solidcore Registered User Join Date: Sep 2017 Location: birmingham, uk Posts: 548	@brian thanks for correcting the mistake mate, much appreciated

22 September 2017, 18:35	#1746
plasmab Banned Join Date: Sep 2016 Location: UK Posts: 2,917	running a live stream of systest with the Samsung ram over on Terrible Fire 2.

22 September 2017, 18:47	#1750
supaduper Registered User Join Date: Oct 2012 Location: Krypton Posts: 1,210	Cheers , mine is nearly a 1000 rounds steve

22 September 2017, 18:52	#1751
plasmab Banned Join Date: Sep 2016 Location: UK Posts: 2,917	Only one TF328 board left :/ yikes Sent from my iPhone using Tapatalk

22 September 2017, 19:07	#1752
plasmab Banned Join Date: Sep 2016 Location: UK Posts: 2,917	All gone:/ Sent from my iPhone using Tapatalk

22 September 2017, 21:25	#1756
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	just an update, i finished the routing, it has to be a 4 layer board hopefully that will be a plus, we'll see, now is the time where i spend hours looking for the obvious mistakes that take forever to find.

23 September 2017, 00:34	#1759
Cylon Registered User Join Date: Oct 2014 Location: Europe Posts: 470	@kipper2k Doesn't you need at least one of the CPLDs to cope with the IDE?

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