One Meg External Memory. EDDAC and DALLAS Clock.
Chips on prototype:
2 x Alliance Memory SRAM, AS6C4008-55PCN- 4Mbit
1 x DS12887+ RTC IC, Date Time Format (Day/Date/Month/Year 12Hr / 24Hr), Multiplexed, 4.5 V to 5.5 V, DIP-24 due to be replaced with Maxim Integrated DS12885S+, Real Time Clock, 144B RAM Multiplexed, 24-Pin SOIC with external battery
2 x Control chips - due to be replaced with Microchip ATF1502ASL-25JU44, CPLD ATF1502ASL EEPROM 36 I/O, 32 Labs, 25ns, ISP, 44-Pin PLCC
2 x Other chips
Production version is due to have a through port for another expansion device.