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- This page gives information on the printer and serial ports, along with
- various sound cards.
-
- Up to 3 printer ports will be shown. The ports are found in a special
- table in the BIOS data area. The Busy, ACK, Paper out, Selected, I/O
- error, and Timed out values are what the printer is reporting. If you set
- your printer off-line, and re-display the page, the Selected line should
- change.
-
- Up to 4 serial ports will be shown. The port addresses are found in a
- special table in the BIOS data area.
-
- The interface between the serial device and the computer is called a UART
- (Univeral Asynchronous Receiver/Transmitter.) There are several types
- typcially used in a PC. The 8250 is usually found in PC/XT's, and internal
- modems. The 16450 typically in AT/386/486's.
-
- A newer type is the 16550. There are several versions. The most common
- is the 16550A/16550AN/16550AFN. These versions contain a 16 byte buffer
- that lets incoming data build up before the computer must read it.
-
- If a program (such as Desqview) has set the port to 0, then INFOPLUS has
- been denied access to it. This is often done to prevent programs from
- interfering with each other.
-
- INFOPLUS can detect several sound cards, including the Adlib, Sound
- Blaster, Roland MPU-401, and Gravis UltraSound.
-
- The Adlib is used by many games, and is cloned by the Sound Blaster. It
- offers several sound and rhythm voices for music and games. There is also
- a special SOUND.COM driver that offers an interface to play music.
- INFOPLUS checks to see if this driver is loaded.
-
- The Sound Blaster, in addition to it's AdLib capabilities, also has a
- digital channel and stereo capabilities. The port shown if found is the
- one used to access the digital capabilities, and is selectable by a jumper
- on the card.
-
- The Roland MPU-401 is actually a MIDI controller.
-
- The Gravis UltraSound uses true digital synthesis to generate sound. It
- has on-board memory (up to 1024K) to hold instrument samples. It can
- emulate an AdLib or SoundBlaster through software adapters. INFOPLUS will
- display it's base port, and the amount of memory on the card.
-
-