@LandBoards

Helping Makers move beyond breadboards

land-boards.com/blwiki/index.php?title=Main_Page
Joined August 2014
  • Tweets176
  • Following188
  • Followers90
89Media
Replying to @tindie
@tindie has let us down. Our store was down for a long time. Then they switched away from PayPal. We've sent them two emails asking them to pay us the balance they owe us and they have not paid us. We have about 100 products for sale and our Land Boards website was built on it.1/
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Smith Chart. youtu.be/GK2pZ_oVU1o?si=e7HJ…

The Scariest Chart in Electrical Engineering

Why is the Smith Chart one of the scariest charts in electrical eng...

youtube.com
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Charlie Morris has some great videos on building classic Amateur Radio circuits. He goes through the math. youtu.be/o6ibX3OYj-s?si=VovM…
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Very kewl.
Andrew McCarthy
@AJamesMcCarthy14 Jan 2025
Just got done watching Mars slip behind the moon. This is a real-time view through my 12” telescope. So cool.
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New Z80 CPU card with LED.
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New 68B09 CPU card with LED.
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New 6802 CPU card with LED.
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Retro computer backplane with CPU, SRAM, Serial, and EPROM cards.
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Little useful gadget that makes it easier to work with FTDI connections. Breakout FTDI connections. Jumpers to select LED polarity.
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RC2014 is a nice project, but I really wanted a 24-bit backplane to support the 68008. Making it work with 6502, 6800, 6809, and Z80 CPUs also.
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New/improved breakout card. Added silkscreen markings and outer ring connections.
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6802 CPU card.
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6809 CPU card.
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6502 CPU card.
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Got all four CPUs working. A couple cuts and jumpers on most of the cards. Added writable LED to CPU cards and ACIA card. Ordered a batch and will build a set - then for sale on Tindie.
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Bigger EPROM (up to 1MB) and 512KB SRAM card.
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Flash/EPROM card with ZIF socket.
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16KB EPROM/SRAM card. Allows for 2 or 4 program banks in 27C256, 27C512 PROMs. Also has 32 SRAM.
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Made a jumperable nop tester card to support 6502, 6800, 6809, Z80 CPUs. 68008 will need a smarter card since nop is two bytes.
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6 slot backplane. 24-bit address, 8 bit data, Easily sourced 80-pin headers. Plug in Switcher.
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Z80 passed nop test.
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6809 passed nop test.
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