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PDP-11/hack with some variations

https://github.com/JPLeRouzic/Kicad-musings/tree/main/PDP11Hack
2•JPLeRouzic•2mo ago

Comments

JPLeRouzic•2mo ago
The original PDP-11/Hack was an attempt at designing a minimal PDP-11 based on a discarded J-11. The J-11 is a microprocessor a bit similar to a 16-bit M68000 or a fast I8086.

http://madrona.ca/e/pdp11hack/index.html

Since that time, many people have made variations on Brent Hilpert design. One of my sources of inspiration is:

https://www.5volts.ch/pages/pdp11hack/

My design has the following features, but I never instantiated it:

* Much more RAM, 512KW

* The data bus is buffered (it is not in other designs)

* It has a GPIO (65C22) (because why not?)

* It can write into the upper byte

* The UART is the 6402, as in Brent Hilpert schematics, but the address is fully decoded to enable using a DEC OS.

* It has 5 switches to test/learn to single-step the memory accesses, the HALT, interrupts, or make a reset

* The boot configuration could be set up with micro-switches

"Far out, man": how Jimi Hendrix boosted the career of Sha Na Na (2024)

https://faroutmagazine.co.uk/how-jimi-hendrix-boosted-the-career-of-sha-na-na
1•thomassmith65•43s ago•0 comments

Build an AI Agent Web App with String and Lovable

https://pipedream.com/blog/build-an-ai-agent-with-string-lovable/
1•todsacerdoti•57s ago•0 comments

Cascading retrieval with multi-vector representations

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1•gk1•7m ago•0 comments

Earn $200 by referring only. FREE

https://waitlister.me/p/trading-platform-of-the-future
1•DavidvsGoliath•8m ago•0 comments

What a bumble bee chooses to eat may not match its ideal diet

https://phys.org/news/2025-07-bumble-bee-ideal-diet.html
1•PaulHoule•8m ago•0 comments

Shutting Down Clear Linux OS

https://community.clearlinux.org/t/all-good-things-come-to-an-end-shutting-down-clear-linux-os/10716
6•todsacerdoti•10m ago•1 comments

Nuxt Joins Vercel

https://vercel.com/blog/nuxtlabs-joins-vercel
1•rattray•15m ago•1 comments

The Kap Programming Language

https://kapdemo.dhsdevelopments.com/examples.html
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A Software for One

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2•jasonthorsness•21m ago•0 comments

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4•bdev12345•22m ago•0 comments

Astronomer launches internal investigation after viral Coldplay video

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2•bb88•22m ago•0 comments

Build your CV on Subreply as a LinkedIn alternative

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Billionaire Gabe Newell: pitching VCs makes no business sense

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12•kristianp•33m ago•2 comments

Fuzzing macOS Userland (For Fun and Pain)

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2•Duanemclemore•47m ago•1 comments

First earthquake, then fire: UC San Diego researchers test steel building

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2•littlexsparkee•49m ago•1 comments

Ask HN: What are your favorite open source AI agent implementations?

2•kanodiaashu•49m ago•0 comments

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EPA says it will eliminate its scientific reseach arm

https://www.nytimes.com/2025/07/18/climate/epa-firings-scientific-research.html
43•anigbrowl•55m ago•7 comments

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"Pitch in " Anti-Litter PSA (1973) [video]

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2•azhenley•1h ago•0 comments

US EPA cutting workforce by 23%, closing research division

https://www.reuters.com/legal/government/us-epa-cutting-workforce-by-23-closing-research-division-2025-07-18/
15•pseudolus•1h ago•2 comments