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== ROM and RAM Identification == Understanding chip identification helps diagnose problems and source replacements. === ROM Chip Layout === '''Apple II Integer BASIC:''' * Monitor ROM: F8 (2716) * Integer BASIC: D0, D8, E0, E8 (2316B mask ROMs) * Sweet16: F0 (2316B mask ROM) '''Apple II Plus Applesoft:''' * Monitor ROM: F8 (2716) * Applesoft BASIC: D0, D8, E0, E8, F0 (2316B mask ROMs) '''Apple IIe:''' * CD and EF ROMs contain entire system firmware * Video ROM for character generation * Can be upgraded to Enhanced IIe with chip kit === RAM Configuration === '''Identifying RAM chips:''' * '''4116:''' 16K ร 1 bit chips (need 8 for 16KB) * '''4164:''' 64K ร 1 bit chips (need 8 for 64KB) * '''Date codes:''' YYWW format (year and week of manufacture) Memory configurations vary: * '''Apple II:''' 4K, 8K, 12K, 16K, 20K, 24K, 32K, 36K, 48K * '''Apple II Plus:''' Usually 48K, rarely 32K or 16K * '''Apple IIe:''' 64K standard, expandable to 128K Memory select blocks on early boards show configuration: * Jumper blocks marked 4K or 16K * Located left of RAM chips near power supply * Most II Plus lack these, indicating 48K standard
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