Someone asked about 720K boot diskette as Primary drive,
I decided to crack open a model 3 and go to town on what I did an indeed I missed a few steps it seems my memory isn't what it used to be , so here is step by step:
*Set up to make this work Drive 0=180k and drive 1 =720k*
*also extra Drive (sd0) configured 3.5 720k floppy drive and extra cable to test final product seen in video)

1. Format (enter) then drive 1, name, double density, 2 sides, 80 tracks , enter at last question.
2. backup sys0/sys:0 :1 (SYS)
3. backup :0 :1 (sys,new)
4. backup :0 :1 (inv,new)
System (sysgen,drive=1)
reboot with newly created LDOS531 Boot diskette

if you get a sys error on any command,
reboot with 3.5 floppy and hold space bar
at LDOS type:
Auto (enter)
System (sysgen,drive=0)
reboot.

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