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Learning Single Board Computers

Former Member

Hello people of the element 14 community! My name is Nehemiah and I am 14 years old. Over the past two years I have been learning electronics such as arduino and a little bit of raspberry pi. I have made a few projects with my arduino (one being my science fair project) and want to do more advanced things. I watch this video by Ben Heck (https://www.youtube.com/watch?v=ZXllm5JWWAs&list=UUhturLXwYxwTOf_5krs0qvA) and wanted to do something similar to that. Could anyone give me a link to the explanation of single board computers and projects like that? That would be so helpful!

 

Thanks in advance,

Nehemiah

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  • I've made homemade 8051 and mc68000* sbcs three decades or so ago.  Big fun!  I used parallel eeproms like what Dennis was describing.  Making a homemade eprom programmer would have been tough.  It needs precise timing, super voltages, some manufacturers weren't telling the programming recipe.  The form-factor similar EEPROMs and SRAMs were more tractable.  I was able to make an eeprom programmer out of a ZIF socket, some latches, a counter and a USART chip.  Assembled electronics was far more expensive then, and we didn't have EBAY.  If you use SRAMS, you can toss in a watch battery and a shottky diode to keep them stable when the main power goes down.  You can degenerate a SRAM into a FIFO or LIFO with a counter on the address lines.  You can dual-port (or, one better, dual-port ping-pong w two ram chips) an SRAM with buffer chips and a wee bit of logic.  Then you could asymmetrically (or symmetrically) multiprocess.

    Also , you can stack two chips on top of each other and solder each identical pin together save an address line.  These come out on a couple soldered-on w/w wires.  Double the capacity, only use Z space!

     

    Stick with CMOS processors, they tend to allow static operation.  DRAM uPs have a low speed in the range of MHz/10 - MHz.

     

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    Earlier, I presumed, reasonlessly, perhaps, that we were limiting the discussion to 8-bit uPs.

  • in reply to D_Hersey

    I like the CMOS idea Don. Assuming you can get the parts it allows for low voltage operation, low currents for when your power layout is marginal and of course low frequencies for when those cables interfere too much ..keep lowering the frequency until it works image.

     

    Note that the designs he's looked at already use Static memory!

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  • in reply to D_Hersey

    I like the CMOS idea Don. Assuming you can get the parts it allows for low voltage operation, low currents for when your power layout is marginal and of course low frequencies for when those cables interfere too much ..keep lowering the frequency until it works image.

     

    Note that the designs he's looked at already use Static memory!

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