[Coco] Disk drive question

[Bruce W. Calkins]

IIRC; the 1 and 2 meg memory systems needed OS-9 patched to boot.

Bruce W.

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----- Original Message ----- 
From: "Bill Pierce"

> My drive on a Coco 3 with 2meg memory, Fd-502/J&M controller, with/without 
> multipak. 1 40trk DS, 1 80trk DS (tried switching drives and jumpers). The 
> drive will read and load an OS-9 level 1 system disk but when I try 
> (several) Os-9 level 2 boot dsks, it either freezes on "OS9 Boot" or 
> starts to boot then resets back to DECB. These boots are know to be good. 
> It also errors on sector 0000 when trying to format a disk. DECB seems to 
> format fine but I have no DECB disks handy to check. OS9 "backup" does not 
> seem to work. lists several errors as it formats, backup disks will not 
> boot afterwards. I've cleaned contacts and attempted to clean heads as 
> well as I could with a q-tip. I do bot have a 2nd coco to check for a bad 
> coco. It seems to be working fine. All commands work fine from the Level 1 
> boot.
>
>