EDOS is FDOS from iCOM, private labeled for the Motorola Exorciser
and Exordisk-I. The Exordisk-I, in turn, is the iCOM FD360 disk
drive cabinet (equivalent to the FD3712). This folder contains a
version of EDOS with some minor patches to allow operation on an
Altair 680 connected to an iCOM FD360/FD3712.

The file PROM.ASM is the EDOS "Resident" PROM. The PROM is located
at $E800 in the Exorciser and in the Altair 680. It can be loaded
into RAM with the Altair 680 Monitor's "L" command (PROM.S19) or
burnt into an EPROM at $E800 (requires an expansion board like the
68-MIO to have EPROM at this address). RAM is required at the 4K
boundary below the EPROM for temp variables and stack space (i.e.,
just below $E000 at $DF00-$DFFF).

The editor, assembler, loader, BASIC, etc., perform pointer compares
assuming 32K or less of RAM. While I've made patches to prevent
issues due to this, you may want to make sure a block of address
space starting at $8000 is not RAM to fool RAM search routines.

In this Altair 680 version, the printer device in EDOS is routed to
the serial port on the UIO (or MIO) board. The high speed paper tape
reader is also routed to the UIO serial port for input. This device
is used by EDOS for the PXGEN and PTAPE commands to load EDOS and to
load programs. This reader device uses CTS/RTS handshaking to throttle
the sending device (most likely a terminal emulator today), so be
sure hardware handshaking is enabled in the termainal emulator.

Device names defined in EDOS are #CN for the console and #LP for the
printer. FORTRAN and RASM accept these device names on the command
line as listing device options.

In BASIC, the delete character was changed from CTRL-O to DEL to
be consistent with EDOS (FDOS). Note that EDIT uses BS instead of
DEL, however, EDIT was NOT changed and still uses BS.

Motorola decided to change the names of many of the FDOS commands,
so refer to "EDOS-II Commands.pdf" as well as the FDOS-II manual
to learn how to run EDOS.