32K ram card problem

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32K ram card problem

Postby Norbert » Feb Wed 23, 2011 11:56 pm

Hi all,

as a glad owner of a new Micro-KIM Version1 Revision 1 I have got a problem with the 32k card. The main board and the 6532 card are running perfectly. I soldered them as kits. But as soon as I connect the ram card and switch power on, there is no power light, Mikro-kim seems to be blocked. The jumpers are set as they should be. As I cannot see the layout/schematic of the card in the web (problem of my browser IE8?) I hope that somebody can give me a hint and/or send me the layout/schematic of this card. One of my favourite suspicions: is the connector soldered in front or on the back of the card?

Thank you in advance from Germany!
Norbert
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Re: 32K ram card problem

Postby garryj » Feb Thu 24, 2011 1:08 am

The connector body is on the silkscreen side of the card. I think the forum link to the memory expansion schematic might be broken, so here is one I made up a while back. Hope it helps.
Attachments
MemoryExpansion.zip
32K Memory Schematic
(27.13 KiB) Downloaded 1009 times
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Re: 32K ram card problem

Postby Norbert » Feb Thu 24, 2011 3:49 am

Thank you for your reply.
Sorry my stupid question but I do not know this english expression: silkscreen side is the components side?
Norbert
 
Posts: 17
Joined: Feb Tue 15, 2011 2:17 am

Re: 32K ram card problem

Postby garryj » Feb Thu 24, 2011 1:28 pm

Norbert wrote:Thank you for your reply.
Sorry my stupid question but I do not know this english expression: silkscreen side is the components side?


Yes, on the component side. "Silkscreen" describes the artwork layer for the text and component outlines printed on the board. Sorry about the confusion.
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Re: 32K ram card problem

Postby Norbert » Mar Tue 01, 2011 5:30 am

The problem is resolved. I had used machine sockets which have a larger pin diameter than the 'normal' sockets.
There is quite a thin conducting path running in parallel with one side of the ram module. Its socket caused a short by touching this path.
Desoldering it damaged some of the paths under the ram module, so - it's a pitty - I had to replace them by thin wires...

Everything is working fine now. Even KB9 basic is running stable with 24510 Bytes free. :D
Attachments
My Micro-KIM.jpg
Running!
My Micro-KIM.jpg (52.83 KiB) Viewed 12812 times
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