STB SYSTEMS, INC.

RIO PLUS

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

[Image]

                                CONNECTIONS

           Function             Label           Function            Label

  Apple ][ game port             J1      Parallel or SASI port       J4

  Unidentified                   J2      Serial port                 J5

  1.5V AA battery connector      J3

                        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 0    Bank 1   Parity 1    Bank 2   Parity 2

   64KB       (8)      (1) 64K    NONE       NONE      NONE       NONE
             64K x      x 1
               1

   128KB      (8)      (1) 64K     (8)      (1) 64K    NONE       NONE
             64K x      x 1       64K x      x 1
               1                    1

   192KB      (8)      (1) 64K     (8)      (1) 64K     (8)     (1) 64K x
             64K x      x 1       64K x      x 1       64K x        1
               1                    1                    1

   256KB      (8)      (1) 64K     (8)      (1) 64K     (8)     (1) 64K x
             64K x      x 1       64K x      x 1       64K x        1
               1                    1                    1

   320KB      (8)      (1) 64K     (8)      (1) 64K     (8)     (1) 64K x
             64K x      x 1       64K x      x 1       64K x        1
               1                    1                    1

   384KB      (8)      (1) 64K     (8)      (1) 64K     (8)     (1) 64K x
             64K x      x 1       64K x      x 1       64K x        1
               1                    1                    1

                               DRAM (CON’T)

   Size      Bank 3   Parity 3    Bank 4   Parity 4    Bank 5   Parity 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) 64K    NONE       NONE      NONE       NONE
             64K x      x 1
               1

   320KB      (8)      (1) 64K     (8)      (1) 64K    NONE       NONE
             64K x      x 1       64K x      x 1
               1                    1

   384KB      (8)      (1) 64K     (8)      (1) 64K     (8)     (1) 64K x
             64K x      x 1       64K x      x 1       64K x        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