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October 8, 2025
Wednesday   12:36 AM
 
 
 
 
 
 
 
 
  Retro Computing - The Good Old Days
S-100 Computers
RetroBrew Computers
Obsolescence Guaranteed
Get or Build a PiDP-8/I
A Zilog Z80 and Intel 8080 systems emulation
Spare Time Gizmos
SBC6120 Front Panel
RetroBrew - The N8
Retro Computing - About small SBC systems

Circuit Cellar: Build Your Own Z80 Computer
PlasMa Mini-Mainframe Simulator
NCOT Technology Welcome! You'll find me writing C or assembly on various old and obsolete systems, letting the magic smoke out of electronics and working on retro computers. All opinions belong to me, or the other voices in my head.
Starting ZX Spectrum Next Programming in C and Z80 Assembly - Devlog #1
I built a computer from scratch! | RC2014 Z80 computer kit assembly.
Retro programming! Pascal and CP/M on an RC2014 Z80 computer
Designing a Card Slot Modular Z80 Computer
Clueless chilled coding - Let's learn Z80 assembler - Retro programming on my RC2014




Understanding the NE555 timer chip:
Astable 555 timer - 8-bit computer clock - part 1 (Ben Eater)
Monostable 555 timer - 8-bit computer clock - part 2 (Ben Eater)
Bistable 555 - 8-bit computer clock - part 3 (Ben Eater)
555-based Clock Schematic (Ben Eater)




Z80 Hardware Resources
Jameco
Digikey
Mouser Electronics
http://www.z80.info/
Small Computer Central
Ponytail Bob and his Pony 80 System


Z80 Software Resources
Portable Z80 cross assembler
Aliados: CP/M emulator for Linux and Unix. Can run CP/M programs directly from command line, no need to prepare disk images or other stuff. Very useful to test the Pasmo sample code.
The Unofficial CP/M Web site Software, documentation and links about the CP/M familiy of operating systems.
John Elliot's pages about CP/M Links, downloads, technical documentation
Gaby's Homepage for CP/M and Computer History Information, downloads, links
C-BIOS C-BIOS is a BIOS compatible with the MSX BIOS (Sinclair ZX Spectrum?)

Z80 Retro #24 - CP/M Introduction
6502 Hardware Resources
Jameco
Digikey
Mouser Electronics
* Build a 6502 computer Ben Eater
6502 Software Resources
Porting existing code to your own SBC: Excellent series by Ben Eater
1 Adapting WozMon for the 6502 breadboard in 256 bytes?!? The Z80 monitor / BIOS I wrote in 1984 was almost 2K.
2 A simple BIOS for the 6502 breadboard computer
3 Running MSBASIC on my breadboard 6502 computer
How Wozniak’s code for the Apple 1 works
6800 Hardware Resources
Jameco
Digikey
Mouser Electronics

6800 Software Resources


1802 Hardware Resources
Jameco
Digikey
Mouser Electronics

1802 Software Resources


"Some have suggested that in today's world, the family has somehow become less important. Well, I can't help thinking just the opposite: that when so much around us is whispering the little lie that we should live only for the moment and for ourselves, it's more important than ever for our families to affirm an older and more lasting set of values. Yet, for all that, in recent decades the American family has come under virtual attack. It has lost authority to government rule writers. It has seen its central role in the education of young people narrowed and distorted. And it's been forced to turn over to big government far too many of its own resources in the form of taxation. Even so, the family today remains the fundamental unit of American life. But statistics show that it has lost ground, and I don't believe there's much doubt that the American family could be, and should be, much, much stronger."
- Ronald Reagan
 
 
 
 
 
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