Re: 8050 mode on 8250 drive

From: William Levak (wlevak_at_cyberspace.org)
Date: 1999-12-06 05:57:20

On Sun, 5 Dec 1999, Nicolas Welte wrote:

> Then I found the file "8250-8050" on the 4040 side. Ken probably used it
> to format the 8050 disk, and it helped also for reading the disk. From
> now on the 8250 wouldn't report an error anymore when trying to read the
> 8050 disk and uni-copy happily copied the files on the disk.
> 
> For those interested, here's the program:
> 
>    10 open 15,8,15
>    20 print#15,"m-w"chr$(172)chr$(16)chr$(1)chr$(1)

This location contains the number of sides.

>    30 print#15,"m-w"chr$(195)chr$(16)chr$(1)chr$(0)

I don't know this one.

>    40 print#15 ,"u9"

This is a jump to 10F0, indirect vector for NMI.

>    50 close 15
> 
> For me it looks like two memory locations are changed an then the drive
> is warm started. 


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