Toshiba T1950 User Manual page 4

The T1950 Series system board is composed of the following major components:
An i486DX2-40 CPU
Super Integration (SI) T9901, which stores the following components:
• Two Direct Memory Access Controllers (DMAC): 82C37
• Two Programmable Interrupt Controllers (PIC): 82C59
• One Programmable Interval Timer (PIT): 82C54
• One Floppy Disk Controller (FDC): TC8565
• One Serial Input/Output Controller (SIO): TC8570
• One Variable Frequency Oscillator (VFO): TC8568
• One I/O Controller
• One Printer Port Controller
• One Speaker Controller
A Real Time Clock (RTC)
One T9934 chip is used. The T9934 has 128 of bytes memory. Fourteen bytes of
memory are used for the calendar and clock. The remaining 114 bytes are used for the
system configuration data.
OSC (X3) generates 32.768 KHz for RTC.
A Keyboard Controller (KBC)
One M37452M4 chip is used.
This KBC includes the keyboard scan controller and keyboard interface controller.
The KBC controls the internal keyboard, external keyboard port, PS/2 mouse port,
and Ball Point Quick Port.
The following memories:
Standard RAM: 4 MB
Cache memory: 8 KB (inside CPU)
BIOS ROM:
Video RAM:
Optional memory cards expand memory to a maximum of 20 MB.
VGA display controller
T1950/T1950CS (GOGH): This controller controls internal and external VGA com-
patible display.
T1950CT (WD90C24): This controller controls internal VGA display and external
SVGA compatible display.
1-4
128 KB (96 KB are used)
This ROM contains Initial Reliability Test (IRT), Basic Input/
Output System (BIOS), and video BIOS.
256 KB