Is there a way to use MFM drives larger than 134mb?
I found this information while reading an article written by Barry Boone in December 1991 issue of Micropendium, on page 36. CAUTION: The work describe in this article refers to modifiying your HFDC and though it is written here you shoulder any risks. In short, don’t cry foul to anyone but yourself if something goes wrong. The HFDC is setup to work with ST506 type drives but mmost drives use an ST504 interface. Everything appears to work until you use drives with more than 8 heads (larger capacity drives). Barry performed some modifications on his HFDC and reportedly it now allows him to use an MFM drive with any number of heads. Modifcation Steps: 1) Cut trace from pin 5 of U9 to pin 5 of U17. 2) Jumper pin 12 of U9 to pin 5 of U17. NOTE: This modification affects the cards compatibility with ST504 drives but will not affect ST506 drives.
