Apple II Rev 0

Posted by musovern on Aug 12th, 2022 in Apple | 1 comment Background on the Apple II Rev 0 Replica The first 6000 or so Apple II’s sold, were equipped with what is called a revision 0 motherboard.  A number of Apple II motherboards were also sold at the same time without case, keyboard or power supply.  Most of these bare board systems were revision 0.  One of these early machines was my personal Apple II.  At some point, when the machine was on loan to a family member’s business, the original rev 0 board failed.  It was repaired via replacing the motherboard with a rev 3 board.  Over the last few years, I’ve been working to restore the... Read More...

Amstrad PPC512 Portable Personal Computer

Posted by musovern on May 12th, 2022 in Amstrad, Vintage Computers | 0 comments The PPC512 had an NEC V30 processor running at 8 MHz, 512 KiB of memory, a full-size 102-key keyboard with a numeric keypad, a built-in liquid crystal display (not backlit)[1] that could emulate the CGA or MDA and either one or two 720k 3.5″ floppy drives (the model was either the PPC512S or PPC512D depending on the number of drives it had). The PPC640 was otherwise identical except that it had 640 KiB of memory, a built-in 2400 baud modem (unusually fast for its day), and its case was a darker shade of grey. Both versions of the machine had an empty socket on the main circuit board so that an... Read More...

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...