These files are a dump of the two 27C256 EPROMs from a Radius 16 Accelerator for a Macintosh SE.
These are ROM v1.8 with a date of 1987.  The paper label has a date of 1988.
ROM 2.1 is required for System 7 support.  This ROM pre-dates System 6 and the Macintosh SE FDHD
and is being uploaded for archival purposes.
A photo is included showing the location of the ROMS on the accelerator.
Looking at the top side of the accelerator, with the PDS connector on the right,
the two EPROMs are at the lower right corner.  HIGH is above LOW.

RADIUS_SE_ACC_v1.8_27C256_ROM_HIGH.BIN
RADIUS_SE_ACC_v1.8_27C256_ROM_LOW.BIN
README.txt
ROM location.jpg

ROMs were dumped using a TL866II Plus.