Dusting off the Memories
Posted: Tue Oct 04, 2022 7:04 pm
Hello all
I have been dragging my OSI systems around for 40 years and I figure it is time to dust them off and get them running.
I learned BASIC programming on an OSI Challenger 3 in high school, then got a few jobs developing software on OSI along with being a repair technician.
I have a Superboard II that seems to have no clock signal. I am in the process of fixing that and then seeing what else needs help.
My OSI C28P is going to be a longer term project. I believe I have the CPU board running with Basic in ROM, 8k Ram, ACIA, and SYNMON rom. I put a FT232RL FTDI Mini USB to TTL Serial Converter Adapter on the serial lines to transfer files at 300 baud. I fixed a broken diode on the keyboard and did a lot of swapping of 8t26 buffer chips to get everything functional. The 542 video card is currently flaking out after warming up, so I am trying to troubleshoot the final video combiner circuitry.
At one point I did a full disassembly and documentation of the OS65D basic and OS along with some of the monitor ROMs and the OS65U disk drivers. I have a dual 8 inch drive setup that needs some TLC along with a box of 20 or so floppies. I also have a "473" IBM/OSI floppy controller that I am going to try to get functional.
I am happy to discuss any of the features of the OSI cards or OSI software.
I have been dragging my OSI systems around for 40 years and I figure it is time to dust them off and get them running.
I learned BASIC programming on an OSI Challenger 3 in high school, then got a few jobs developing software on OSI along with being a repair technician.
I have a Superboard II that seems to have no clock signal. I am in the process of fixing that and then seeing what else needs help.
My OSI C28P is going to be a longer term project. I believe I have the CPU board running with Basic in ROM, 8k Ram, ACIA, and SYNMON rom. I put a FT232RL FTDI Mini USB to TTL Serial Converter Adapter on the serial lines to transfer files at 300 baud. I fixed a broken diode on the keyboard and did a lot of swapping of 8t26 buffer chips to get everything functional. The 542 video card is currently flaking out after warming up, so I am trying to troubleshoot the final video combiner circuitry.
At one point I did a full disassembly and documentation of the OS65D basic and OS along with some of the monitor ROMs and the OS65U disk drivers. I have a dual 8 inch drive setup that needs some TLC along with a box of 20 or so floppies. I also have a "473" IBM/OSI floppy controller that I am going to try to get functional.
I am happy to discuss any of the features of the OSI cards or OSI software.