Epson EL 486UC+

External cache jumper settings*

Video memory configuration

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*If you have no external cache installed, the position of these jumpers does not matter.

Processor type jumper setting

 

J21

J22

486DX, DX2

1-2,3-4

1-2

486SX

2-3

Off

SIMM Installation

Your computer comes with 4MB of memory on a SIMM. You can increase the memory up to 64MB by installing 1MB, 2MB, 4MB, 8MB, 16MB, and 32MB (when available) SIMMs in the computer’s two SIMM sockets. The following table shows the possible SIMM configurations; any SIMM can be installed in eitherbank.

Sample SlMM configurations

Use only tin-plated, 32-bit or 36-bit, 72-pin, fast-page mode SIMMs that operate at an access speed of 70ns (nanoseconds) or faster. Be sure all the SIMMs operate at the same speed.

* Standard video memory

Video resolutions and colors

External Cache

You can install 64KB, 128KB, or 256KB of external cache on the EL 486UC+.

c3 To install 64KB of external cache, use eight SRAM, 28-pin, 8K x 8, 20ns DIP chips, and one 8K x 8, 20ns tag chip

0To install 128KB of external cache, use four SRAM, 28-pin, 32K x 8, 20ns DIP chips, and one 32K x 8, 20ns tag chip

PTo install 256KB of external cache, use eight SRAM, 28-pin, 32K x 8, 20ns DIP chips, and one 32K x 8, 20ns tag chip.

For the cache memory to work properly, you must install chips in the following configuration (each bank contains four cache memory sockets).

Microprocessor Upgrades

The computer’s processor can be upgraded by replacing the existing microprocessor with a faster one. You can either purchase an upgrade kit from Epson or buy the individual components separately, as listed in the following table.

Microprocessor upgrade components

Video Memory

The EL 486UC+ comes with 512KB of video memory

 

installed on the main system board. You can increase the

 

video memory to 1MB by installing four additional DRAM,

 

20-pin, 70ns or 80ns, 256KB x 4-bit DIP chips.

* For the SX/25, SX/33, and DX/33 processors

Epson EL 486UC+-4

12/1/93