The Apple IIe Card (Apple Computer part #820-0444-A) is a compatibility card which allows compatible Macs to run software designed for Apple II computers (except the 16-bit Apple IIGS). Released in March 1991 for use with the LC family of Macintosh computers, Apple targeted the card at its widely dominated educational market to ease the transition from Apple II-based classrooms, with thousands of entrenched educational software titles, to Macintosh-based classrooms.
Like the Apple IIe itself, the Apple IIe Card uses an onboard 65C02 CPU. The CPU is software-configurable to run at the Apple IIe's native 1.0 MHz speed or at an accelerated 1.9 MHz. Video emulation (text and graphics) was handled through software using native Macintosh QuickDraw routines, which often resulted in operations being slower than a real Apple IIe except on higher-end machines. Any Macintosh that supports the card can be switched into 560x384 resolution for better compatibility with the IIe's 560x192 High-Resolution graphics (essentially doubled on the Macintosh). This was particularly applicable to the Color Classic which was otherwise fixed at 512x384 resolution.
The host Macintosh emulates, or provides native access to many of the expansion cards and peripherals one might install in a bare Apple IIe. These services provided to the IIe card makes the simultaneous running of the host's OS 7.x.x impossible. Hardware services include a 1.44 MB 3.5" SuperDrive, mouse, 1 MB RAM, 80-column text and graphical monochrome or color display, clock, numeric keypad, two hardware serial ports ports (in addition to the emulated serial necessary for the IIe mouse), SCSI hard drive, and AppleShare file server. An included "Y-cable" enables the attachment of up to two external 140 KB floppy disk 5.25" Drives, an 800 KB "intelligent" 3.5" Unidisk drive, and a joystick or paddle control for use with the hard-coded Apple IIe emulator. 800 KB 3.5" Drive and 1.44 MB SuperDrives are not recognized when attached via the Y-cable due to the Disk Controller on the IIe card (IWM version lacks support). (chip labeled U1A located in zone A1 of card - lower left as pictured above)
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