Mass Storage - Epson EL 486UC Product Support Bulletin

Q17. What type of SRAM chips and how many do I need to upgrade the
Epson EL 486UC computer's optional external secondary cache?
A. To upgrade the Epson EL 486UC computer's external secondary cache to
32KB requires five pieces of a 8KB x 8 Bit, 20ns SRAM in a 28 Pin DIP
package.
or
To upgrade the Epson EL 486UC computer's external secondary cache to
128KB requires five pieces of a 32KB x 8 Bit, 20ns SRAM in a 28 Pin DIP
package.
These SRAM chips are installed in locations U34, U44, U51, U59 and U63
on the computer's main system board. In addition to adding the SRAM
chips, jumpers J7, J10, J11, J13 and J14 on the computer's main system
board must be set as shown below*.
Cache size
32KB
128KB
* If you have not installed optional SRAM memory chips, the position of
these jumpers does not matter.

MASS STORAGE

Q18. What factory floppy and hard disk drive configurations are offered
with the EL 486UC computer?
A. The Epson EL 486UC computer is shipped in a single configuration that
includes a 3.5" 1.44MB (high density) floppy disk drive and a 120MB IDE
hard disk drive.
J7 J10
Off 1-2
On 2-3
PSB No: S-0168
Page: 8 of 9
J11 J13
1-2 1-2
2-3 2-3
J14
1-2
2-3