TECHNICAL BULLETIN COPYRIGHT 1985 DATE: February 11, 1985 REVISION DATE: February 11, 1985 BULLETIN NO: I/O:84 PRODUCT: 26-3650B PC-4A Pocket Computer SUBASSEMBLY: N/A SUBASSEMBLY REVISION: N/A ______________________________________________________________________________ PURPOSE: To describe the correct 1K RAM pack usage for the PC-4A. ______________________________________________________________________________ DISCUSSION: In the original PC-4 (26-3650) there is a memory backup protective circuit. When the one chip CPU in the 26-3650 was changed to the 26-3650A version, this memory backup circuit was removed. In order to retain this feature a new 1K RAM pack was designed for the new version PC. This new RAM pack incorporates the memory backup circuit in it. PROCEDURE: The following table lists the correct RAM pack to be used with each PC. POCKET COMPUTER | 1K RAM PACK -------------------------------- 26-3650 PC-4 | 26-3653 26-3650A PC-4 | 26-3653A 26-3650B PC-4A | 26-3653A TB I/O:84 PAGE 1 OF 1