osiweb.org

Jeff wrote: I think I might dig into the BASIC assembly and see if that can be changed.... bwa..ha ha ha!
Long Live the Superboard!

Yes that would be useful to use the full 32col video. Install Cegmon as well then add Premier ROMs and HexDOS and it starts to look like a worthy SIII contender.

Scott do you still have a working OSI system? What was that "small DOS" ? Nice thing about the A2 and OSI is how easily they can communicate together. RS232, CFFA ADTPro to PC to OSI etc. I converted OSI extended monitor to run on the A2 complete with a DOS command parser. You make some valid hardwa...

Welcome Stephan. Great to hear from another OSI user and what a nice C1P. We are happy to help sort the RS232 for you. What test equipment do you have ? I have a working C1P RevD with serial @ 600/2400 baud that I use with Tera Term and winOSI emulator on the PC. I will check my RevD cct against the...

THE MAN !
Nice 4P... I wonder where that ends up ? Do you have a buy now Mike?

PS "If it hangs booting tk0 check controller TX/RX CLK/DATA timing adjustments and particularly the data separator timing as this is CRITICAL and an minor miss adjustment here means go no go." First note the position of the data separator trim pot. Then make a very minor adjustment either side of th...

Further investigation: With a faulty Tk0 0 sensor the drive will still Boot. I turn off the 24V supply and move the head manually to tk0 and it will boot. It will step in to tk 1 from tk0 and will again boot but if it is stepped in to tk2 it will not boot as it appears to only step out 1 track. That...

Jeff, A faulty track zero sensor will cause the drive not to step if you press D from the boot prompt. I have a temporary fix to my 8" drive after the sensor lead broke. If I moved the head away from TK0 and tried to boot it loaded the head but did not move it. The TK0 sense line was LO always! Does...

Hitachi 8" Floppy Drive FDD-403DB

Does anyone have circuit diagrams / info on Hitachi FDD-403DB 8" Floppy drive ?

Proving hard to fix without circuits !
Mike

Ooops, I will check the Util for bugs and mouse droppings !

; page 400 ROM BASIC Support for a C1 / Superboard $FC00 ?? ; page 500 keypoller maps to $FD00 for a C1 / Superboard ; page 600 monitor maps to $FE00 for a C1 / Superboard ; page 700 'D/C/W/M' maps to $FF00 for a C1 / Superboard LDX $FE01 ; FFCA AE 01 FE X = contents of $FE01, holds a $28 ; Serial M...