Epson EL 486UC - Manual (Page 117)

Option
slots Three 16-bit, full-length and two 8-bit,
half-length I/O expansion slots, ISA
compatible, 8 MHz bus speed
Speaker
Internal
Muss
storage
Two 3 ½ inch wide, third-height drives
(one internal mount) and one 5 ¼ inch
wide, half-height drive
Diskette
drives Your system supports the following
diskette drives:
3.5-inch diskette drive, 1.44MB
(high-density) storage capacity
5.25-inch diskette drive, 1.2MB
(high-density) storage capacity
3.5-inch diskette drive, 720KB
(double-density) storage capacity
5.25-inch diskette drive, 360KB
(double-density) storage capacity
Hard
disk
drives
3½-inch form factor hard disk drive(s), up
to half-height size; the first mounted
internally, and the second mounted in the
horizontal drive bay
Other devices Half-height tape drive, CD-ROM, or other
storage device; 5¼-inch or 3½ inch with
mounting frames
Specifications A-3