SVGA (1MB Cirrus Logic) GD542x IREF Circuit Comparison (and fix)
CL-542x Data Book
Compatible SOJ DRAM Chips Compatible SOJ DRAM Chips (from Peter) The memory modules should be 70ns or faster. If you are adding extra video memory on the adapter, use chips with the same or lower access time as the existing modules.
The same chips are used on the PC750, PC720 (Japanese) IBM planars and Reply PowerBoards. SOJ DRAM Pinout Pinout of the 256K x 16 DRAM 40-pin SOJ chips.
/--------------+ Vcc --+o 1 40 +-- Vss DQ1 --+ 2 39 +-- DQ16 DQ2 --+ 3 38 +-- DQ15 DQ3 --+ 4 37 +-- DQ14 DQ4 --+ 5 36 +-- DQ13 Vcc --+ 6 35 +-- Vss DQ5 --+ 7 34 +-- DQ12 DQ6 --+ 8 33 +-- DQ11 DQ7 --+ 9 32 +-- DQ10 DQ8 --+ 10 31 +-- DQ9 nc --+ 11 30 +-- nc nc --+ 12 29 +-- CASL# WE# --+ 13 28 +-- CASH# RAS# --+ 14 27 +-- OE# nc --+ 15 26 +-- A8 A0 --+ 16 25 +-- A7 A1 --+ 17 24 +-- A6 A2 --+ 18 23 +-- A5 A3 --+ 19 22 +-- A4 Vcc --+ 20 21 +-- Vss +--------------+
Vcc = +5V DC, Vss = GND |