Epson Equity II Product Support Bulletin(s) - Page 22
Equity Ii Mcy Board Y147205000 & Y147206000 Jumper Configurations
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EQUITY II MCY BOARD Y147205000 & Y147206000 JUMPER CONFIGURATIONS MCY board Y147205000 and Y1472056000 differences. MCY P/N Y147206000 boards have the following improvements over the Y147205000 board. * Serial port works over 1200 baud. * Concurrent oper- ation of 8087 & optional Dynamic RAM or EGA/VGA. * Topview fix incorporated on MCY (main) board. On Batt Off Reset Dip Switch Vol. Keyboard I JUMPER CONFIGURATIONS * J1 and J2 should be in position 2 to enable DMA RAM refresh to the option slots for expanded memory boards or EGA/VGA video boards. The 8087 will work in DMA refresh mode with the Y147206000 board. * J1 and J2 should be in position 1 to disable DMA RAM refresh. The V30 runs about 20% faster in this position. The jumpers must be in position 1 to enable an 8087 with the Y147205000 MCY board * J3 and J4 should be in position 1 to use an IBM compatible keyboard. * J3 and J4 should be in position 2 (default) for the Equity II keyboard. NOTE: DO NOT ATTEMPT TO USE THE EPSON KEYBOARD WITH JUMPERS J3 AND J4 IN POSITION 1 AS DAMAGE MAY RESULT! ----- Page 5 of 6 -----