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| • | IBM 5150 motherboard of type 16KB-64KB: Upgrading to the 10/27/82 revision of the IBM BIOS ROM requires: 1. Different settings of motherboard switch block SW2. 2. Due to bugs, that all four motherboard RAM banks be populated. |
| • | Trantor T130B: It is reported that if a ROM is to be fitted to the ROM-less version of the card, that a missing PAL chip also needs to be fitted. |
| • | Compaq Portable motherboard: Upgrading to revision C of the motherboard BIOS ROM requires: 1. Different settings of motherboard switches - see here. |
| • | Olivetti M24 (AT&T PC 6300): A ROM upgrade may require different PAL chips - see here. |