Understanding the Apple IIE

Understanding the Apple IIe is a learning guide and hardware manual for the Apple IIe computer. Inside: Documents all motherboard circuits, including diagrams and descriptions of the inner workings of the MMU, IOU and timing HAL. Describes disk controller operation, including previously undocumented details of the logic state sequencer. Reveals previously unnoticed features of Apple graphics. Explains double-res. Explains differences between the Apple II and the Apple IIe. Contains 15 software and hardware Application Notes including EPROM mods, disk write project mod, split screen programming, and the DOS HOSS firmware card mod. Includes a chapter on maintenance that provides simple troubleshooting steps. Describes the PAL (European) motherboard video circuits. Contains more than 100 illustrations. Includes valuable programming reference material and documents 1985 firmware upgrade.