| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | PAL20R8 |  448Kb/14P | Progammable Array Logic Series 24 (PAL Series 24) |
| PAL20R8 |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
 National Semiconductor ... | PAL20R8-4JC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R8-4JM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R8-4NC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R8-4NM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R8-4VC |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |
| PAL20R8-4VM |  1Mb/18P | Programmable Array Logic 24-Pin Medium PAL Series -7,-5,and -4 |