Toshiba T4900CT Manual page 7

Sound Controller
Windows Sound System compatible sound unit is used. One AD1848 chip supports
PCM sound, and YMF262 (OPL3) with YAC512 (DAC) supports FM synthesizer
sound.
Clock Generator receives 14.31818 MHz (X1) and generates the following frequen-
cies:
• 50 MHz for the CPU (CPU operates 75MHz)
• 14.7456 MHz for the COM
• 24 MHz for the FDC and VFO
• 16 MHz is used for GA
• 14.31818 MHz for Video Controller
OSC (X3) generates 32.768 KHz for RTC.
Gate Array
System Controller Gate Array
This gate array has the following functions:
• CPU Controller
- SMI Control
- CPU Clock Control
• Memory Controller
- 64-bit bus memory control (standard DRAM area)
- 32-bit bus memory control (expansion memory area)
• Bus Controller
- 64 to/from 32-bit data path width convert
- 32-bit local bus control
• Address Latch Controller
- Address convert
- Address Latch
• I/O Register
- Register re-storing for resume
- Special Register
• Processing Speed Controller
T4900CT
1-7