90/30

The 90/25, 90/30 and 90/40 were a class of more-or-less 360 compatible computers. The 90/30 was roughly equivalent to a 360/50 in terms of speed and capabilities.

Sperry Univac introduced the Univac 90/30 in about 1975 to provide an upgrade path for 9x00 users and to compete with IBM's System 3. It used a disk operating system and had either a 300 or 600 lines per minute printer, a card reader, optionally a card punch, a console (Uniscope 100), attached disk drives that had removable disk packs, several 1600 or 6250 BpI tape drives, and an optional communications controller supporting up to 12 terminals (later 24) The standard disk drive was the 8416 which held a multi-layer platter removable disk pack that held approximately 29 million bytes. The 8418 drive was an enhanced version that supported both 29MB and "double-density" 58MB disk packs. These disk drives operated on the IDA (Integrated Disk Adapter). There was also an optional 8430 drive with a 100MB capacity that operated on a separate high speed selector channel. Available tape drives were the Uniservo 10 (Mux Channel) and Uniservo 14 (Selector channel). The optional Selector Channel also enabled the use of other high speed devices such as the 1200 lpm 0776 printer or the 2000 lpm 0770 printer. The machine had either 4K or 16K memory chips, and typical machines had between 128 to 512 KiB memory. It ran an OS called OS/3, and could run up to 7 jobs at one time, not counting various OS extensions such as the print spooler and telecommunications access (ICAM). It was an upgrade path for users who had outgrown the IBM System/3. It ran Cobol-74, RPG2, Fortran, and Assembler. The instruction set of the 90/xx series was implemented in microcode and was loaded into control storage as part of the boot up process, before loading the operating system.

Source: Wikipedia

This emulator implements the entire 90/30 instruction set excluding the option floating point instructions. Peripherals include the U100 console, 0717 reader, 0773 printer and up to 8 8416/8418 disks. A copy of OS/3 Release 4.2 from 1978 is included. The OS includes all utilities and compilers.

This emulator was written by me, so if you have any questions or (heaven forbid) bugs to report you can contact me and I will do my best to help you.

You can download the emulator here: Windows installer