About Previous

Previous is a NeXT computer hardware emulator. It is able to emulate the following machines:

• NeXT Computer (original 68030 based Cube)
• NeXTcube (including Turbo variant)
• NeXTstation (including Color and Turbo variants)

Previous runs all versions of the NeXT operating system from NeXTstep 0.8 through OPENSTEP 4.2. It can connect to the internet or to your host system for file sharing. It supports video output at 1120 x 832 pixels with up to 32-bit color and CD quality sound output, including DSP audio processing. Furthermore it supports printing to PNG files at 400 dpi resolution. Previous can be run with up to seven emulated SCSI disk drives, up to two magneto-optical disk drives and one floppy disk drive. It almost completely matches the features of real black hardware.

For running Previous you need a copy of the NeXT ROM.

In more detail Previous emulates the following components:

Processor	68040 CPU or 68030 CPU combined with 68882 FPU, 56001 DSP
Memory	Up to 128 MB RAM
Special chips	Proprietary DMA controller, optical disk drive ECC controller and NeXTbus interface chip
Mass storage	SCSI disk drives (hard disk, CD-ROM and floppy), magneto-optical disk drives and floppy disk drive
Network	Virtual Ethernet connected through SLiRP
Video	2-bit grayscale or 16-bit color screen
Graphics	NeXTdimension board with i860 processor and up to 64 MB RAM with 32-bit color screen and support for dual screen setup
Sound	16-bit stereo sound output, telephone quality sound input
Printer	400 dpi NeXT laser printer
Clock	Real time clock with host time synchronization
Input	Virtual mouse and keyboard

Currently missing components are:

• NeXTdimension video interface
• Serial ports
• Apple Desktop Bus