CPU	Cache Size	MIPS Core	DRAM Interface	PCMCIA Controller	ISA	Max MHz	Features
VR4101	I=2k data=1k	R4000	16 bit 8MB EDO	None	2MB Linear address; 8/16 bit width	33MHz	64 Key kbd
VR4102	I=4k data=1k	R4000	32/16 bit 32MB EDO	VR4171	64MB Linear Address; dynamic bus-sizing	66MHz	Serial, Audio, 96 Key kbd, D/A conv
VR4111	I=16k data=8k	R4000	32 Bit 64MB DRAM		dynamic bus-sizing	100MHz	Serial, Audio, 96 Key kbd, D/A conv
VR4121	I=16k data=8k	R4000	DRAM/SDRAM	VRC4171A		168MHz	Serial, Audio, 96 Key kbd, D/A conv
VR4131	I=16k data=16k	R4000	SDRAM			200MHz	Serial, IrDA
TX3912 / TMP3912U	I=4k data=1k	R3000	DRAM/SDRAM			73.7MHz
TX3922 / TMP3922U	I=16k data=8k	R3000	DRAM/SDRAM			166MHz	IrDA
PR31100	I=4k data=1k	R3000	SDRAM/DRAM	None		40MHz	no MMU
PR31500	I=4k data=1k	R3000	SDRAM/DRAM	None		40MHz	BE or LE modes
PR31700	I=4k data=1k	R3000	SDRAM/DRAM	Built-in		75MHz	BE or LE modes