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boards:sbc:sbc_v2:sbc_v1 [2018/06/08 08:13] (current)
b1ackmai1er created
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 +===== Changes from V1 =====
 +
 +The V2 is upward compatible. The main difference is the added jumpers to allow 48k/16k memory mapping as an alternate to 32k/32k. All of the V1 software will run on the V2 with default jumpers.
 +
 +The V2 board has major corrections to the external Bus Master logic to support DMA. The V1 board is not able to support DMA. Since there are no add-on boards which have a DMA controller, this circuit update has never been tested or used.
 +
 +The serial interface is jumper configurable to support DTR/DSR protocol (V1 compatible),​ or RTS/CTS protocol (not on the V1).
 +
 +There is an DS1210 on the V2 board to provide 512k SRAM battery backup. The V1 does not have this capability. The RTC SRAM is battery backed on both boards.
 +
 +There is an option jumper on the Parallel Interface connector to strap pin 25 to either GND or +5v. On the V1 board this pin is tied to GND.
 +
 +The V1 board has a Power On LED; the V2 board has a HALT(red)/​RUN(green) bi-color LED. This is considered extremely cool.
 +
  
boards/sbc/sbc_v2/sbc_v1.txt · Last modified: 2018/06/08 08:13 by b1ackmai1er
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