External Cache; Microprocessor Upgrades; Hard Disk Drive Types; Video Memory - Epson EL 486UC Product Information Manual

Epson EL 486UC

Video Memory

The EL 486UC comes with 512KB of video memory. You can
increase the video memory to 1MB by installing four video
DRAM, 20-pin, 70ns or 80ns, 256KB
For the to work properly, you must install chips in
memory
the following configuration (each bank contains two video
memory sockets).
Video memory chip configuration
Bank 0 Bank 1
(U18 and U39) (U24 and U43)
Soldered Filled
Soldered Filled
* Standard video memory

External Cache

You can add either 32KB or 128KB of external cache to the
EL 486UC by installing SRAM chips. For 32KB, use five
28-pin, 8 x 8, 20ns DIP chips. For 128KB, use five 32 x 8, 20ns
DIP chips. After adding external cache, be sure to change
jumpers J7, J10, J11, J13, and J14
cache installed.

Microprocessor Upgrades

The computer's 80486SX/25 microprocessor can be
upgraded to a 486SX/33, 486DX/33, 486DX2/50, or
486DX2/66. You can either purchase an upgrade kit from
Epson or buy the components separately, as listed in the
following table.
Microprocessor upgrade components
Use the following table to identify the general steps you need
to perform to upgrade your microprocessor. The pages listed
in the final column tell you where to find instructions in the
User's Guide for performing those steps.
Epson EL 486UC-4
4-bit, DIP chips.
x
Bank 2 Bank 3
(U25 and U47) (U31 and U53)
Filled Filled
match the
to amount
Microprocessor upgrade procedures
If you Install
486SX/33
486DX/33
Total
memory
486DS2/50
512KB *
1024KB
486DX2/66
of

Hard Disk Drive Types

The following table lists types of hard disk drives you can
use in the computer. Check this table and your hard disk
manual to find the correct type number(s) for the hard disk
drive(s) installed in the computer. You need to enter the type
number(s) when you set the hard disk drive configuration in
the SETUP program.
Hard disk drive types
8/15/93
Remove existing processor chip
Install the 486DX2/50 chip
lnstall a head sink on the chip