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
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