The diskROM is not mirrored (as far as I know), but the FDC registers can be mirrored to several places in the slot with the diskROM. The diskROM is in page 1. Here is a list of machines with disk drives or external disk drives and in which other pages the FDC registers are visible.
| machine | page 0 | page 2 | page 3 |
|---|---|---|---|
| Philips VG 8230 | no | no | no |
| Philips VG 8235/00 | no | yes | no |
| Philips VG 8235/20 | no | yes | no |
| Philips NMS 8245 | no | yes | no |
| Philips NMS 8250/55 | yes | yes | yes |
| Philips NMS 8280 | yes | yes | yes |
| Spectravideo SVI-738 | yes | yes | yes |
| Sony HB-F1XDJ | no | no | no |
| Sony HBD-50 | yes | yes | yes |
| Philips VY-0010 | yes | yes | yes |
| Panasonic FS-FD1A | yes | yes | yes |
The subROM is in page 0, but it can be mirrored to other pages as well, as listed here.
| machine | page 1 | page 2 | page 3 |
|---|---|---|---|
| Philips VG 8230 | no | no | no |
| Philips VG 8235/00 | no | no | no |
| Philips VG 8235/20 | no | no | no |
| Philips NMS 8220 | no | no | no |
| Philips NMS 8245 | no | no | no |
| Philips NMS 8250/55 | yes | yes | yes |
| Philips NMS 8280 | yes | yes | yes |
| Sony HB-F1XDJ | no (kanjibasic) | no (kanjibasic) | no |
| Sony HB-F9P Russian | yes | no | no |