The 32-bit 68882 math coprocessor runs at 40 megahertz and accelerates the execution of complex math functions, including trigonometric and logarith- mic series. Parity DRAM and a parity controller can be built into the Macintosh IIfx system as an option. A 512K ROM SIMM socket on the logic board provides an easy upgrade path to future versions of ROM SIMMs. A built-in zero-wait-state 32K Static RAM Cache provides high levels of.
Two 256-byte, built-in instruction and data caches (Harvard architecture). 68882 floating-point coprocessor (IEEE stan- dard80 bits precision). RAM in the Macintosh IIfx can be increased to 8 megabytes. The Macintosh IIfx uses 80-nanosecond RAM. As denser, 4-megabit and 16-megabit RAM chips become available, RAM can be increased to 32 and 128 megabytes, respectively.Two dedicated I/O processors manage low- level I/O tasks for the serial ports, floppy disk drive(s), and Apple Desktop Bus, providing higher levels of overall system performance. NuBus provides a multiplexed 32-bit address bus and data bus on a single 96-pin connector. Cards can be plugged into any slot and the system will automatically identify and configure each card, without DIP switches or jumper wires. The NuBus architecture supports data transfer rates of up to 37.5 megabytes per second. SCSI (Small Computer System Interface). SCSI is a high-perform- ance interface bus used to connect hard disks and other SCSI-based devices, such as the AppleCD SC. Built-in zero-wait-state 32K Static RAM Cache memory architecture. 80-nanosecond, fast- page mode, 64-pin SIMMs. Apple Scanner, to the Macintosh IIfx.
Up to seven SCSI peripherals, including an internal hard disk, can be connected. The Macintosh IIfx SCSI subsystem is managed by a dedicated SCSI/DMA controller, which increases system efficiency. The SCSI I/O subsystem can provide data transfer rates in excess of 3 mega- bytes per second.
The Macintosh IIfx provides full ROM support for all AppleTalk protocols, and includes built-in serial ports for LocalTalk net- work connections. Macintosh system software includes: System Tools Version 6.0.5 or greater (the Macintosh operating system).
Version 1.2.5 (or greater) is in- cluded. A/UX Version 2.0 (optional) is compatible with the Macintosh IIfx. 4- or 8-megabyte memory configurations. The item "Apple Macintosh II with Macintosh IIfx Logic Board Upgrade (M0375LL/A)" is in sale since Monday, July 5, 2021.
This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Manuals & Merchandise". The seller is "firedraw" and is located in Lakeville, Minnesota.
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