PC Chipset Chips:

The following are the ID numbers for the various chip circuits in a PC.
(In the old days, these chips were all placed separately on the
motherboard. Nowadays, however, they are usually integrated into one
or two larger chips. However, even if they are all mounted in a single
chip, that chip is still referred to as the "chipset".)

Keyboard Controller: 8041 (PC/XT) or 8042 (AT)
DMA Controller: 8237
PIT (Programmable Interval Timer): 8253 (PC/XT) or 8254 (AT)
Programmable Peripheral Interface: 8255
PIC (Programmable Interrupt Controller): 8259
Floppy Drive Controller: 8272
Clock Generator: 8284
Bus Controller: 8288
CMOS Real-Time Clock: MC146818
UART (Serial Port) Controller: 8250, 8251, 16450, 16550, or 16550A