OSI Superboard RevD
Posted by musovern on Feb 14th, 2022 in Ohio Scientific | 0 comments
This is my OSI Challenger C1P Superboard RevD Starting to Populate the PCB Klyball 600D Next up testing the System with the CEGMON ROM and added the cherry MX switches with a custom keycap set. I’ll add a home made RAM upgrade so I have 32k RAM Installed 32K RAM-UPGRADE Now to start on a case I had some spare alloy from another project. Did a rough size up of the C1P. Thanks Philip Keyboard cutout. Did the cutout for the keyboard and made up a rough 3D printed badge for the size of my case. Thanks again Philip for the Font. Final test fit now with the bottom Aluminum case part made just needs a... Read More...
OSI Replica Computer
Posted by musovern on Jun 25th, 2021 in Ohio Scientific | 0 comments
Getting a OSI Challenger system together Test setup Have finished the keyboard OSI 505 board OSI 560Z OSI 502 OSI 540b CP4 setup working Floppy Disk and Gotek working Read More...
The Altair 8800c Clone:
Posted by musovern on Jun 25th, 2021 in Altair 8800c, S100 | 0 comments
The Altair 8800c clone faithfully recreates the iconic computer that ignited the personal computing revolution in 1975. Revered as the first commercially successful microcomputer, the original Altair 8800 captured the imaginations of hobbyists, engineers, and future tech giants. This modern clone pays homage to the pioneering design, replicating the distinctive front panel with its rows of switches and LEDs, while incorporating modern enhancements for reliability and usability. Whether you’re a vintage computing enthusiast or someone seeking to relive the early days of the microcomputer era, the... Read More...
2650 Mini Computer
Posted by musovern on Feb 15th, 2020 in 2650-mini-computer, Vintage Computers | 0 comments
A remake of the EA 2650 mini system In May 1978, Electronics Australia described a small development board based on the Signetics 2650 microprocessor. For many people in Australia (the author included), this was the first computer that was cheap enough to buy and build even if you were a student or beginner. This update to the simple and elegant design of the original provides a new PCB that evokes the original while adding modern alternatives to some of the hard-to-get parts of the original. The original article text is included at the end of this document The new board has three options over the... Read More...
Apple II Plus
Posted by musovern on Feb 3rd, 2020 in Apple, Vintage Computers | 0 comments
The Apple II+ was the successor of the Apple II.
It was fully compatible with the Apple II, however, has some new features: a new ROM containing the AppleSoft Basic (floating point version written by Microsoft), a new auto-start (store in ROM) for easier start-up and screen editing, 48 KB RAM, text modes were the same as the
Apple II, but the graphic modes were enhanced. They’re the same as the Apple 2e: 16 colors with low resolution and 6 colors with high resolution. In fact the 6-color mode was also available on the Apple II since the revision 1 of the motherboard.