A repository of bug-fixed and patched software projects for DEC PDP-11 systems, targeting real hardware, SimH, and PiDP-11 emulators running RT-11 and RSX-11M-PLUS. The two main projects are FIG-FORTH v1.4, which corrects garbled terminal output and a corrupted screen file, and FOCAL-11 V11-01C, which fixes an infinite recursion crash in the FEXP function.
- FIG-FORTH originally marked dictionary names with a high bit that modern terminals rendered as a literal "?" character; the patch strips it before display without affecting the dictionary
- The FORTH.DAT file was distributed with a VARIABLE RMS record format, embedding 2-byte length headers every 512 bytes that appeared as stray characters in screens
- FOCAL-11's XFEXP computed e^x by recursively halving the exponent until it fell below -8, but zero's exponent never decreases, so the recursion ran the stack into memory; all other math functions already had a depth guard
- FOCAL is a BASIC-like language from the late 1960s; Lunar Lander was originally written in it
- FIG-FORTH originally marked dictionary names with a high bit that modern terminals rendered as a literal "?" character; the patch strips it before display without affecting the dictionary
- The FORTH.DAT file was distributed with a VARIABLE RMS record format, embedding 2-byte length headers every 512 bytes that appeared as stray characters in screens
- FOCAL-11's XFEXP computed e^x by recursively halving the exponent until it fell below -8, but zero's exponent never decreases, so the recursion ran the stack into memory; all other math functions already had a depth guard
- FOCAL is a BASIC-like language from the late 1960s; Lunar Lander was originally written in it
* **Enigma Touch:** Jürgen Müller’s Enigma replica is now available for order, featuring a unique all-electronic design and a focus on replicating the original user experience. A Google Group has been created for discussion and related activities.
* **PiDP-1:** The PiDP-1 kit is nearing completion and expected to ship at the end of July, with both console and rack-mounted versions available. A Google Group has been launched for the PiDP-1 community.
* **ARPANET Reconstruction:** Lars Brinkhoff has made significant progress in reconstructing the ARPANET, allowing for connections between emulated PDP-10s and modern Linux machines. The project seeks volunteers to expand the network.
* **LGP-30:** Work is underway on a replica of the LGP-30, with a focus on creating an authentic 1950s metal case.
* **PiDP-10 & Software:** Updates on software for the PiDP-8/11, and a note about running the original Micro-Soft BASIC on a PiDP-10.
* **Whirlwind:** Initial planning for a Whirlwind replica is underway.
* **PiDP-1:** The PiDP-1 kit is nearing completion and expected to ship at the end of July, with both console and rack-mounted versions available. A Google Group has been launched for the PiDP-1 community.
* **ARPANET Reconstruction:** Lars Brinkhoff has made significant progress in reconstructing the ARPANET, allowing for connections between emulated PDP-10s and modern Linux machines. The project seeks volunteers to expand the network.
* **LGP-30:** Work is underway on a replica of the LGP-30, with a focus on creating an authentic 1950s metal case.
* **PiDP-10 & Software:** Updates on software for the PiDP-8/11, and a note about running the original Micro-Soft BASIC on a PiDP-10.
* **Whirlwind:** Initial planning for a Whirlwind replica is underway.
The December 2024 newsletter from Obsolescence Guaranteed covers updates on new projects such as PiDP-10 and PiDP-1, news about existing projects like PiDP-8 and PiDP-11, and upcoming plans for 2025 including a PiDP-1 replica and an annual programming competition.
CEDS is a retrocomputing micro-factory, producing and shipping PiDP-10 replica kits. They also offer assembled PiDP-11 units, with the option of selecting assembled or unassembled kits in the order form. For placing an order, fill in the required information and submit the order form.
includes bsd etc images
