This change lays the groundwork for adding support for Rev 3 3B2 models,
which includes the Model 500, Model 600, and Model 1000.
Rather than use the fixed strings "400" and "1000" in file names, the
strings "rev2" and "rev3" will be used, which allows greater flexibility
to implement various system configurations more easily.
Additionally, this change adds a copy of the Debug Monitor (DEMON) ROM
image for the Rev 2 board, to be used soon in a later checkin.
Some compiler & linkers on some platforms don't dynamically provide
a way to determine the library search path, so if /lib and /usr/lib exist
as directories they are added to the end of the library search path.
As reported in #1026
Any graphics done within any simulator is done via explicit SDL APIs.
If a host has SDL available, the natural mechanisms used to reference
SDL pieces will automatically create the proper references to the
available SDL components.
Change test for -e (exists) instead of -d (directory) so that the .git
entry is detected correctly and git version stamp logic runs as in any
other git repo. The .git entry is a file when the repo is a submodules
and possibly other obscure cases like multiple worktrees.
fixes#988
Custom TTL design by Marvin Minsky. There are two displays: one
raster scan for bitmapped characters, and another random scan for
vector graphics. There is also a keyboard, and a UART for talking
to a host computer.
The computer is normally booted off a ROM which reads and starts a
secondary loader from the UART. The loader is responsible for reading
the payload, which comes in checksummed blocks. The LOAD command
accepts files in same format.
This commit adds a "PMMI" device to the AltairZ80 VM that emulates
the PMMI Communications MM-103 MODEM & Communications Adapter.
This device was added at the request of a Facebook user that is
attempting to preserve and document various relevant communications
programs for CP/M and allow users to experience communicating and
sharing information with other remote computers of the same time
period, all on modern hardware.
This device attempts to emulate the MC6860L digital modem chip in
such a way that communications software written for the PMMI MM-103 can
communicate over a serial port or socket without a phone line or
the ability to MOdulate/DEModulate data over a phone line.
This commit adds two new devices, "M2SIO0" and "M2SIO1", to the AltairZ80
VM. These two independent devices emulate "raw" 88-2SIO ports that can
be used instead of the "SIO" device for attaching socket and serial
ports using TMXR.
All interesting simh host platforms have long supported libSDL2
functionality which wasn't the case when sim_video was initially
implemented. The mixed API set significantly complicates maintaining
and extending sim_video, hence this explicit effort to remove
the vestiges of the old libSDL API.
Refactor in preparation for the addition of a Rev 3 simulator for the
3B2/1000 system.
This change also includes a full cleanup of the rat's-nest of includes
and externs that plagued the 3B2 simulator and made it difficult to
understand and maintain. Headers are now required in the following
order:
compilation unit -> "3b2_defs.h" -> {... dependencies ...}
Finally, HELP has been added to the CPU device.
These were possibly useful options when asynch support was being
added long ago. Async simulator I/O is quite stable and should always
be leveraged whenever pthreads is available.
