When making today's ISI model changes, Hugh noticed that an LLO ISI model was using the new style BIO part whereas LHO is using the old style. For documentation purposes and with the aim of standardizing post-O2, here is a list of H1 models and the type of BIO parts they use.
| models which use the old-style part | models which use the new-style parts (input or ouput or both) |
| ISI BS | PSL ISS |
| ISI ETMX | ISI HAM4 |
| ISI ETMY | ISI HAM5 |
| ISI HAM2 | SUS BS |
| ISI HAM3 | SUS ETMX |
| ISI HAM6 | SUS ETMY |
| ISI ITMX | SUS ITMX |
| ISI ITMY | SUS ITMY |
| SUS IM | SUS SRM |
| SUS MC1 | SUS TMSX |
| SUS MC2 | SUS TMSY |
| all IOP models for systems with BIO cards * |
* Note that the IOP models use the old style parts, one per card, for initialization purposes. Models using this part use two parts per physical card, mapping to the lower and upper 32 bits.