For sale: 37k RAM expanders with gold plated connectors

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eslapion
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For sale: 37k RAM expanders with gold plated connectors

Postby eslapion » Tue Jan 30, 2018 12:17 pm

Full featured 37k RAM expansions, with gold plated edge connector, reset button and full DIP switch controls.

Features:
- RAM expansion in BLK 1,2,3 and 5 areas with read-only mode on switch
- 3k RAM expansion area ($0400-$0FFF)
- IO2 and IO3 areas
- Master enable/disable switch
- Uses only new components - no NOS parts
- Full RoHS compliant boards and components
- Full schematics available

Pricing is 20 Euros or 24.50$US

102_0804.JPG
DIP switches
102_0803.JPG
Prototype

DIP switches functions:
1- BLK1 RAM enable ($2000-$3FFF)
2- BLK2 RAM enable ($4000-$5FFF)
3- BLK3 RAM enable ($6000-$7FFF)
4- BLK5 RAM enable ($A000-$BFFF)
5- BLK 1,2,3 and 5 read-only/normal
6- BLK 1,2,3,5 enable
7- IO2,3 RAM enable ($9800-$9FFF)
8- 3k RAM enable ($0400-$0FFF)

Yes, there is a battery holder but this feature is untested at this point and not included at the above price.
No one can do everything. Everyone can do something.

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Radical Brad
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Re: For sale: 37k RAM expanders with gold plated connectors

Postby Radical Brad » Tue Jan 30, 2018 2:24 pm

Nice looking board!

May I ask which PCB house you use?
I will be looking to make a few boards for various projects.

Brad

norm8332
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Re: For sale: 37k RAM expanders with gold plated connectors

Postby norm8332 » Tue Jan 30, 2018 5:18 pm

Good idea making the grounds a bit longer. 8)

eslapion
ultimate expander
Posts: 4541
Joined: Fri Jun 23, 2006 7:50 pm
Location: Canada
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Re: For sale: 37k RAM expanders with gold plated connectors

Postby eslapion » Tue Jan 30, 2018 7:05 pm

Radical Brad wrote:Nice looking board!

May I ask which PCB house you use?

This is a small batch (prototypes). In small quantities, OshPark is the least expensive.

Production units may look different.

norm8332 wrote:Good idea making the grounds a bit longer. 8)

This is Fredric's idea actually.
No one can do everything. Everyone can do something.


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