Thanks, Wolfgang. Youre very helpful, as always :)
Yes, I meant drives, of course.
Some programs, such as Qpac2 Files and Qmenu's DIR_ and FILE_SELECT$
seem to assume a maximum of 8 DDDs so, presumably, devices beyond that
would not be accessable via these programs.
Per
On 29/12/2017 15:47, Wolf via Ql-Users wrote:
Hi Per,
1) Is there is a limit to the number of directory device drivers
that can be loaded at once (I believe there is/was and the number
was 8?)
No, there is no limit that I'm aware of. I'm pretty sure I already
had more than 8 different devices loaded at some time. (you can test
this with the sub device, jut use Wined or some such to change the
device name every time and load it 10 times....)
2) Is there is a limit of 16 devices (ie driver + device number
1..8) that can be in use at the same time?
It is true that only 16 drives (not devices) can be accessed at once.
This limit is set in the system variables :
sys_fsdd equ $0100 16*long pointers to Filing System Drive
Definitions
sys_fsdt equ $0140 Filing System drive Definition table Top
sys.nfsd equ $10 max Number of Filing System Drive definitions
sys_fsch equ $0140 long linked list of Filing System CHannel
blocks
Back in the day, I seem to recall that once one had accessed one's
allotted 16 devices, no further devices could be opened. (One had
to do a DEL_DEFB to proceed.)
Yes, except that it's drives, not devices.
So if you have files open on flp1 ... flp8 and win1 ...win8 - that's
it.
Recently I discovered that if a device is no longer in use, its
slot will be re-used, but I havent seen this documented anywhere.
Do you have information on any of this?
Not without checking in the source code, but I'm pretty sure that
this is the correct scheme.
HTH
Wolfgang
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