ND100 emulator project

The ND100 Emulator Project (nd100em) strives to be able to completely run ND-100 code and emulate a ND-100 computer to the degree it can boot and run SINTRAN III.

Authors

• Per-Olof Åström
• Roger Abrahamsson
• Zdravko Dimitrov
• Göran Axelsson

Status

• In active development. Most of the basic instructions implemented and some of the system ones. MMS implemented. Able to run some ND100 software.

• It can run BPUN files, but has a long way until all system functions are working. MAC sort of works, as well as INSTRUCTION-B, which is the main test program used for now to see how well it behaves.

• Version 0.1.6 introduced functions to measure emulator speed, and on a 2.6GHz P4, it is around 5-10 times on average faster than an original ND-100, counted per instruction over a large number of instructions. The code is NOT optimized for speed at all.

• Version 0.1.9 runs a lot more code, and can handle BPUN files straight off.

• Usually the projects experimental code is further ahead than these versions available here.

• You can join the project mailinglist (closed sumbission).

Wanted Information

• Specifications for IOX1-3.

Done Partially solved, Rack Controller.

• Specifications for IOX4-7.

Done Partially solved, Memory Parity.

More information about these would be good though, like where more documentation about them is found, or register flags/values.

• Information about expected behaviour of CLEPT and SETPT (Inparameters, effects etc)

• Information about undocumented instructions, particularly 142700...

Done Partially solved

142700 - GECO -

Done161000 - IOT. an old ND1 pre IOX instruction, details in ND1 manuals.

• PROG File format.

Done Solved

• Details of Floppy IOX calls...

Done Solved, see 3010.

• Newer version of INSTRUCTION VERIFY, this one lacks test for BCD and CX instructions.

Current one is...

DoneDATE ISSUED - 83.11.01

We now have up to versions from 1988

• Details about the PANS, PANC registers and the front panel.

There apparently is a real time clock here that keeps date etc for example, and newer test program versions tries to locate that.

• An output dump from VERSN run on at least one real ND 110+

Has to be run 16 times, as the installation number is that long. A reg bit 11-8 is set to byte num, then VERSN called

Output comes in A, T, AND D register.

Bit 15-4 of A= Print version. 3-0 is ALD, T=Microprogram version, lower byte of D=installation num.

Known Bugs

• MOVB

Needs fixing for a few edge cases.

• NLZ

Not properly identified yet what needs to be done.

• DNZ

Not properly identified yet what needs to be done.

• FDIV

Not properly identified yet what needs to be done.

Documentation

Some online documentation is generated with Doxygen.

Also a copy of README-CODING-IO has been added here on the wiki for easy access.

Code

Latest development code can be found in the development git tree.

• v0.1 - Initial release, able to run image of ND100 MAC
• v0.1.1 - New command parser, some floating point support
• v0.1.2 - Rearranged to new structure, new instructions added
• v0.1.3 - Lots of bugfixes and some more instructions
• v0.1.4 - multithreading, IOX infrastructure. Bugfixes.
• v0.1.5 - Runlevel switching in WAIT, basic rtc interrupt functionality, fixes all over
• v0.1.6 - IDENT infrastructure, Config file handling, bugfixes, profiling
• v0.1.7 - Bugfixes, handles paging and interrupt. New tracing model.
• v0.1.8 - Bugfixes, partially runs INSTRUCTION-B testprogram now.
• v0.1.9 - Bugfixes,new tracing, runs INSTRUCTION-B to a degree we can use it to test instructions.
• v0.2.0 - Corrected PT/APT handling, IRQ fixes, runs completely through PAGING-B.BPUN, don't crash out on RTC-12-1902B.BPUN anymore.
• v0.2.1 - Bugfixes, some memory leaks fixed. Change from mutex to semaphores, and tested build on 64 bit Linux and FreeBSD.
• v0.2.2 - Bugfixes, MOVBF & FAD fixed, IOX on nonexistant devices fixed, disassembly functionality added, and a bunch of small changes. Build tested on 64 bit Linux but not FreeBSD.
• v0.2.3 - Some compile errors crawled into v0.2.2, so this is a quick new release to fix it.

This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See version 2 and version 3 of the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA