The original p-code architecture could address only 64 KB of RAM. There were four versions of the p-code architecture, and the Sage used the final one, p-System IV. Although this extra level of interpretation sapped performance, it also meant that the p-System could be (and was) brought up easily on a machine since most of the OS and utility software didn’t even need to be compiled - p-code was transportable across very different machines. Like Java, the p-code programs were then interpreted by a native machine language program. The source program was compiled to an abstract stack machine using a pseudo machine language, called p-code. Eventually UCSD transferred ownership and rights to SofTech, who continued developing it, including the version used by the Sage. The UCSD p-System was an operating system written in Pascal with a lot of standard software for writing/compiling/debugging Pascal programs (compilers for other languages also existed). More interesting than the hardware is that the primary operating system used by the Sage II was the UCSD p-System, specifically a multi-user version of p-System IV. Another way to distinguish the machines is that the first edition had under bars and over bars on the “II” of “Sage II”, while the second didn’t have them (see the picture above). The earlier version had full height 5.25″ floppies the later version had half height 5.25″ floppies and a corresponding reduction in the height of the box.
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#Mostek 6502 emulator serial
External connections included a serial port for communication with a terminal, a serial port for communication to a modem, a parallel port for connection to a printer, and an IEEE 488 port. It had no hard disk (that was left to the Sage IV).
![mostek 6502 emulator mostek 6502 emulator](http://wondersmith.com/rants/sargon2.gif)
As is obvious from the picture, it has two integral 5.25″ floppies. The quick synopsis of the machine is that it contains a 68000 running at 8 MHz and has 512 KB of DRAM. The Sage II computer was introduced by Sage Technology of Reno, Nevada in 1982.