From: larry_fosdick@hotmail.com
wrote in message
news:1171305058.740737.26920@s48g2000cws.googlegroups.com...
>
>
> Ok, here is my problem(s)
>
> My 1984 Model IV Is a non-gate array unit. Over the years I've
> upgraded this unit to green screen, and 128K with the Pal chip.
>
> My Dual 5.25 180k Drives work ok, but the floppys are all getting
> old,and worn out. my disks are suffering from mold, and I wanted to
> upgrade the unit to dual 3.5 720K drives. So, I found two good drives
> and tested both of them on a IBM. They check out fine. I'm using DSDD
> 720k disks. But when I installed them on my IV. I can't format them as
> Double Sided. So I only get 360K out of them... Is this normal? If I
> try and format them as DD, 2 sided 80 track, it counts to 79 and
> fails.
> but If I leave them, as DD 1sided 80track it formats fine. This
> happens on both drives in any cobo of installation
>
> Do I have to tell LS-631 dos that they are 2 sided drives? or is this
> a limitation of my Floppy controller?
>
> HELP! my unit is in pieces untill I get this squared away.
>
I also have a Model 4, non gate-array, and it has two 360K 5.25" drives
inside. I attached a 3.5" drive as an external Drive :2, and was able to
format 80 tracks, DSDD. One of my 4P's has two 3.5" drives, and I have no
problem with those, either.
What make of floppy drives are you using? Do they have jumpers for RDY,
drive select, etc.? Many newer ones don't have jumpers. You can't use a
cable with a twist on the TRS-80.
Just for fun, did you try to format 40 tracks, double sided?
Did you build your own cable, or just use a card edge to pin adapter? If
you built the cable, is there any chance that the pin 32 (I think) is not
going through?
Larry
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