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| 54F219 | National Semiconductor | 64-Bit Random Access Memory with TRI-STATE Outputs |
| 54F410 | National Semiconductor | Register Stack 16 x 4 RAM TRI-STATE Output Register [Life-time buy] |
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| CD54HC670 | Texas Instruments | High Speed CMOS Logic 4-by-4 Register File |
| CD74HC670 | Texas Instruments | High Speed CMOS Logic 4-by-4 Register File |
| CD74HCT670 | Texas Instruments | High Speed CMOS Logic 4-by-4 Register File |