Exos

ExOS was developed by J.Schemmel and released by the german paper magazine 64'er in the December issue of 1986. It was published as a ROM patch which copied the original C64 Kernal to $2000 and patched it there. The reader was supposed to use a monitor to save the new ROM using a monitor then. The ROM is simply burned to an 8k eprom and added to the C64 using a kernal switching board then. ExOS does not require a change on the drive ROM.

REX Datentechnik released Exos v3 as a cartridge (order number 9805).

V-DOS by Völkner Electronic (order number 9716) was created by J.Schemmel as well and is said to have similarities.

Functionality

Fast serial load (can be disabled)
LOAD"$",8 redirected to screen output on direct mode
Start and end address output
OLD function
RAM floppy functions
some extended LIST support

Notes

v3 to v4 changes are not yet documented
ExOS is known to be not the most reliable speeder due to the increased speeding of the stepper motor within the drive