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Product Support Bulletin
Subject: Equity Series SIMM Compatibility
Date: 12/4/91
Page(s): 1 of 1
Due to the influx of third party SlMMs on the market, there are some that are not
compatible with Epson products. This bulletin is intended to be an aid in ensuring
that only compatible SlMMs are chosen for use in Epson's Equity Series of
computers.
The SlMMs in question were SEIMENS, CUMULUS and KINGSTON. Installing these
SlMMs in Epson products may cause the following errors:
It was thought that the chips used in these SlMMs were of poor quality.
Epson Portland evaluated the SlMMs in question and found that this was not true.
The problem is caused by the SIMM circuit boards (ITE and TECAP circuit boards)
used to manufacture the SIMM modules. The dimensions of these boards are not
compatible with industry standard SIMM sockets. This may result in incomplete
contact between the SIMM assembly and it's socket. This is caused by insufficient
size of the contact surfaces in these products. Also enlarged holes in the TECAP
product allow the component pin to pass entirely through the hole without making
contact.
It is recommended that only SIMMS meeting industry standard contact surface
specifications be used in Epson Equity computer products.
Some recommended SlMMs that were tested and found Compatible are:
For more information contact Technical Support.
Parity Check 1
18FFFE 0000 202 Memory Address Error
164 System Options Not
1500 E000 201" DOS RAM Address Error
Toshiba
Matsushita
CDC Enterprises
Samsung
Aculogic
PSB No: S-0136
Originator: JAD
Set
EPSON