Date   : Fri, 23 Jan 1998 19:10:57 +0000 (GMT)
From   : Rich <rst20@...>
Subject: Re: Osword call with &70 (ADFS)

On Fri, 23 Jan 1998, Mark Usher wrote:

> Hi
> 
> A call to &FFF1 with A% set to &70 returns the follwing block
> 
> 0 Master Sequence Number
> 1 Status byte b7 Tube present
>   b6 Tube claimed by ADFS
>   b5 Winchester controller present
>   b4 n/u
>   b3 n/u
>   b2 *OPT 1 flag
>   b1 Bad Free Space Map
>   b0 IRQ pending
> 
> Can anyone tell me
> a) what the Master Sequence Number is
> b) Under what circumstances would the ADFS claim the TUBE
> c) what is *OPT 1
> 
> Hope someone knows.

Well, here goes... if memory serves me correctly, then:

a) It's the two digit number (00-99) which appears after the disc title
and (I think) counts writes to the disc.  I could never really imagine a
use for it personally, but there we go.

b) er, haven't a clue - never really knew anything about the Tube anyway.
Anyone else?

c) On the disc system, *OPT1,n only had any use when n=2, and it caused
the filing system to print out full catalogue info (*INFO style) whenever
a file was loaded (and I think saved).  *OPT1,0 turned it off and *OPT1,2
turned it on, so I presume that's what that flag is.

Hope that helps,

Rich
-- 
+-------------------------------------------+-------------------------+
| Richard Talbot-Watkins,                   | Tel: 01223 500997       |
| St Catharine's College, Cambridge CB2 1RL | E-Mail: rst20@...       |
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