The Vesta board works with either 28 or 32 pin ROMs and RAMs. The cost of this is that you have to worry about the jumper settings on the RAM/ROM selection block.

Jumper block J2, as you look at it with J2 at the top, the rom on your left, and the 332 on your right, looks like this:

   |--EPROM--| |-RAM-|
   ___ ___ ___ ___ ___
J |   |   |   |   |   |
2 | O | O | O | O | O |
  |   |   |   |   |   |
  | O | O | O | O | O |
  |   |   |   |   |   |    RAM
  | O | O | O | O | O |     |
  |___|___|___|___|___|     V     68332 ->

(J2 orientation)

ROM Jumper selection

Set the three leftmost jumpers according to the ROM size you are using:

32Kx8 EPROM (27C256)

   ___ ___ ___ ___ ___
J |***|***|***|   |   |
2 |*o*|*o*|*o*| O | O |
  |***|***|***|   |   |
  |*o*|*o*|*o*| O | O |
  |***|***|***|   |   |     RAM   
  | O | O | O | O | O |      |
  |___|___|___|___|___|      V    68332 ->

64Kx8 EPROM (27C512), 128Kx8 EPROM (27C1001, 27C010)

   ___ ___ ___ ___ ___
J |   |***|***|   |   |
2 | O |*o*|*o*| O | O |
  |***|***|***|   |   |
  |*o*|*o*|*o*| O | O |
  |***|***|***|   |   |     RAM    
  |*o*| O | O | O | O |      |
  |***|___|___|___|___|      V    68332 ->

256Kx8 EPROM (27C2001, 27C020)

   ___ ___ ___ ___ ___
J |   |   |***|   |   |
2 | O | O |*o*| O | O |
  |***|***|***|   |   |
  |*o*|*o*|*o*| O | O |
  |***|***|***|   |   |     RAM    
  |*o*|*o*| O | O | O |      |
  |***|***|___|___|___|      V    68332 ->

512Kx8 EPROM (27C4001, 27C040)

   ___ ___ ___ ___ ___
J |   |   |   |   |   |
2 | O | O | O | O | O |
  |***|***|***|   |   |
  |*o*|*o*|*o*| O | O |
  |***|***|***|   |   |     RAM    
  |*o*|*o*|*o*| O | O |      |
  |***|***|***|___|___|      V    68332 ->

RAM Jumper selection

Set the two rightmost jumpers according to the RAM size you are using:

32Kx8 RAM (62256), 128Kx8 RAM (628128)

   ___ ___ ___ ___ ___
J |   |   |   |   |***|
2 | O | O | O | O |*o*|
  |   |   |   |***|***|
  | O | O | O |*o*|*o*|
  |   |   |   |***|***|     RAM
  | O | O | O |*o*| O |      |
  |___|___|___|***|___|      V    68332 ->

512Kx8 RAM (628128)

   ___ ___ ___ ___ ___
J |   |   |   |   |   |
2 | O | O | O | O | O |
  |   |   |   |***|***|
  | O | O | O |*o*|*o*|
  |   |   |   |***|***|     RAM   
  | O | O | O |*o*|*o*|      |
  |___|___|___|***|***|      V    68332 ->

 512Kx8 RAM (628128)

Second serial port

Vesta boards come wired for a second serial port. TPU pins 1 and 4 are wired to extra receive and transmit lines respectively on the serial level converter chip. When dealing with serial ports using ARC, this port is serialb and the built-in uart seriala.

To enable the second serial port follow this procedure:

Remove J10 (located beside the serial connectors) to enable the port regardless of what TPU5 is doing.
Place a jumper across J12 to connect TPU1 to the receive line. (On more recently produced Vesta boards, this jumper may not exist).
Connect a serial cable to pins 3, 4, and 5 of J5 which is just like the standard one connected to pins 0, 1, and 2.

Now you can use the second serial port.

The baud rate of the second serial port defaults to 9600 baud, but may be changed by setting the persistent serialb_baud to a different value and resetting the board.

To make portb be the default serial interaction port, set the persistent default_port to 1. The default value of 0 specifies that seriala should be used.

To open streams on portb, use `fopen("/serialb/foo","")' (where foo is replaced by whatever you want to name the stream) for multiplexed streams or fopen("/serialb/foo","R") for a raw unmultiplexed stream.

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Vesta Hardware Specifics

Vesta Board Diagram

Vesta RAM/ROM selection Jumpers