STB SYSTEMS, INC.
=================

   RIO PLUS

   Card Type       Memory/Multi-I/O                               
   Maximum Onboard 384KB DRAM                                     
   Memory          
   I/O Options     Apple ][ game port, clock/calendar, parallel   
                   port, SASI hard drive controller, serial port  
   Data Bus        8-bit ISA                                      
   Hard Drives     Up to seven SASI drives                        
   Supported       

<gopher://bitreich.org/I/th99/c/S-T/21046-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |        Function         | Label |     Function     | Label |
   |-------------------------+-------+------------------+-------|
   | Apple ][ game port      |  J1   | Parallel or SASI |  J4   |
   |                         |       | port             |       |
   |-------------------------+-------+------------------+-------|
   | Unidentified            |  J2   | Serial port      |  J5   |
   |-------------------------+-------+------------------+-------|
   | 1.5V AA battery         |  J3   |                  |       |
   | connector               |       |                  |       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                 Setting                 | Label | Position |
   |-----------------------------------------+-------+----------|
   |>> | Memory enabled                      | SW1/3 |    On    |
   |---+-------------------------------------+-------+----------|
   |   | Memory disabled                     | SW1/3 |   Off    |
   |---+-------------------------------------+-------+----------|
   |>> | Parallel port address is 378h       | SW1/6 |   Off    |
   |---+-------------------------------------+-------+----------|
   |   | Parallel port address is 278h       | SW1/6 |    On    |
   |---+-------------------------------------+-------+----------|
   |>> | Serial port address is 3F8h (COM1:) | SW1/7 |   Off    |
   |---+-------------------------------------+-------+----------|
   |   | Serial port address is 2F8h (COM2:) | SW1/7 |    On    |
   |---+-------------------------------------+-------+----------|
   |>> | J4 is a parallel port               | SW1/8 |   Off    |
   |---+-------------------------------------+-------+----------|
   |   | J4 is a SASI port                   | SW1/8 |    On    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            DRAM                            |
   |------------------------------------------------------------|
   | Size  | Bank 0 | Parity | Bank 1 | Parity | Bank  | Parity |
   |       |        |   0    |        |   1    |   2   |   2    |
   |-------+--------+--------+--------+--------+-------+--------|
   | 64KB  |  (8)   |  (1)   |  NONE  |  NONE  | NONE  |  NONE  |
   |       | 64K x  | 64K x  |        |        |       |        |
   |       |   1    |   1    |        |        |       |        |
   |-------+--------+--------+--------+--------+-------+--------|
   | 128KB |  (8)   |  (1)   |  (8)   |  (1)   | NONE  |  NONE  |
   |       | 64K x  | 64K x  | 64K x  | 64K x  |       |        |
   |       |   1    |   1    |   1    |   1    |       |        |
   |-------+--------+--------+--------+--------+-------+--------|
   | 192KB |  (8)   |  (1)   |  (8)   |  (1)   |  (8)  |  (1)   |
   |       | 64K x  | 64K x  | 64K x  | 64K x  | 64K x | 64K x  |
   |       |   1    |   1    |   1    |   1    |   1   |   1    |
   |-------+--------+--------+--------+--------+-------+--------|
   | 256KB |  (8)   |  (1)   |  (8)   |  (1)   |  (8)  |  (1)   |
   |       | 64K x  | 64K x  | 64K x  | 64K x  | 64K x | 64K x  |
   |       |   1    |   1    |   1    |   1    |   1   |   1    |
   |-------+--------+--------+--------+--------+-------+--------|
   | 320KB |  (8)   |  (1)   |  (8)   |  (1)   |  (8)  |  (1)   |
   |       | 64K x  | 64K x  | 64K x  | 64K x  | 64K x | 64K x  |
   |       |   1    |   1    |   1    |   1    |   1   |   1    |
   |-------+--------+--------+--------+--------+-------+--------|
   | 384KB |  (8)   |  (1)   |  (8)   |  (1)   |  (8)  |  (1)   |
   |       | 64K x  | 64K x  | 64K x  | 64K x  | 64K x | 64K x  |
   |       |   1    |   1    |   1    |   1    |   1   |   1    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        DRAM (CON'T)                        |
   |------------------------------------------------------------|
   | Size  | Bank 3 | Parity | Bank 4 | Parity | Bank  | Parity |
   |       |        |   3    |        |   4    |   5   |   5    |
   |-------+--------+--------+--------+--------+-------+--------|
   | 64KB  |  NONE  |  NONE  |  NONE  |  NONE  | NONE  |  NONE  |
   |-------+--------+--------+--------+--------+-------+--------|
   | 128KB |  NONE  |  NONE  |  NONE  |  NONE  | NONE  |  NONE  |
   |-------+--------+--------+--------+--------+-------+--------|
   | 192KB |  NONE  |  NONE  |  NONE  |  NONE  | NONE  |  NONE  |
   |-------+--------+--------+--------+--------+-------+--------|
   | 256KB |  (8)   |  (1)   |  NONE  |  NONE  | NONE  |  NONE  |
   |       | 64K x  | 64K x  |        |        |       |        |
   |       |   1    |   1    |        |        |       |        |
   |-------+--------+--------+--------+--------+-------+--------|
   | 320KB |  (8)   |  (1)   |  (8)   |  (1)   | NONE  |  NONE  |
   |       | 64K x  | 64K x  | 64K x  | 64K x  |       |        |
   |       |   1    |   1    |   1    |   1    |       |        |
   |-------+--------+--------+--------+--------+-------+--------|
   | 384KB |  (8)   |  (1)   |  (8)   |  (1)   |  (8)  |  (1)   |
   |       | 64K x  | 64K x  | 64K x  | 64K x  | 64K x | 64K x  |
   |       |   1    |   1    |   1    |   1    |   1   |   1    |
   |------------------------------------------------------------|
   |      Note:The information of which chips are the parity    |
   |      chips is unidentified.                                |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      MAINBOARD MEMORY                      |
   |------------------------------------------------------------|
   |        Size        |       SW1/1       |       SW1/2       |
   |--------------------+-------------------+-------------------|
   |        64KB        |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |       128KB        |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |       256KB        |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |       320KB        |        Off        |        Off        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   SERIAL PORT INTERRUPT                    |
   |------------------------------------------------------------|
   |      Setting       |       SW1/4       |       SW1/5       |
   |--------------------+-------------------+-------------------|
   |        IRQ3        |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |        IRQ4        |        On         |        Off        |
   +------------------------------------------------------------+