Re: [Ql-Users] Quanta Magazine

[John Southern via Ql-Users]

Hi All,

I have taken over as the membership secretary.

The latest magazine is incredibly late and that is purely down to me
and I am working through that today.

Simon, Michael, Ian, you should have all received copies up to and
including April/May 2017.

Can you send me you email address to my personal email -
linuxtarragon@gmail just so I know I have the correct one and I will
send out your copies.

Regards
John Southern

On Sun, Jul 23, 2017 at 12:42 PM, IAN BURKINSHAW via Ql-Users
 wrote:
> I have not received the magazine either.
> In fact the last one I received was Oct/Nov 2015.
> I keep meaning to contact Quanta, but just not around to it.
> Ian
>
> On Sunday, 23 July 2017, 11:28, Michael Bulford via Ql-Users 
>  wrote:
>
>
>  I've received two issues this year, up to the Feb/March issue.
> None received since then.  I did email John Gilpin last week, but no reply as 
> yet.
>
>
> Michael
> Dilwyn wrote:
>
>> I've forwarded this to committee members (don't know the answer myself),
>> hopefully a reply soon.
>>
>> Dilwyn
>>
>> -Original Message-
>> From: sba1derson via Ql-Users
>> Sent: Sunday, July 23, 2017 9:08 AM
>> To: ql-us...@q-v-d.com
>> Subject: [Ql-Users] Quanta Magazine
>>
>> Has anyone received an electronic copy of Quanta magazine since the
>> January/February 2017 issue?  I've not received one since.  I've contacted
>> Quanta via their website but so far have had no response.
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Re: [Ql-Users] Maximum length of files on QL file-system

[Alain HAOUI via Ql-Users]

For qubide with driver qubata v3.x the max file size supported may be 2 
gigabytes minus some data structure kilobytes, provided you have created a 
suitable big partition with 64 sectors per block.
This is the maximum under qdos with 2 words indexes when used as unsigned.
Regards,
Alain

-Message d'origine-
De : "Jan Bredenbeek via Ql-Users" 
Envoyé : ‎23/‎07/‎2017 17:21
À : "ql-us...@q-v-d.com" 
Objet : Re: [Ql-Users] Maximum length of files on QL file-system

On 23 July 2017 at 15:47, Andrea Carpi via Ql-Users <
ql-users@lists.q-v-d.com> wrote:

>   Hello everybody
>
> Trying to transfer large files between Windows 10,
> QPC2, and QL-Aurora-SGC-Qubide I have noticed that there are big
> limitations in the maximum length of the files.
>
> I mean:
> - On QXL.WIN
> hard drive in QPC2 I'm not able to generate files longer than 50Mb (End
> Of file error)
> - On the Qubide hard drive the limit is 19Mb (ROM 2.01),
> but perhaps also depends on the partition creation choices
>
> - On Ram
> Disk (in QPC2 maximum RAM 128 Mb) I did not find any limits unless the
> size of the RAM
> - I did not find limits on DOS devices from QPC2 except
> those of the file system in use on Windows (NTFS)
>
> Specifically for
> QXL.WIN and QUBIDE do anyone know the exact length limits and
> why?
>

The QDOS file system stores the file position in the channel definition
block as two 16-bit words - one for the block number and one for the byte
position within one block. So, when using 512-byte blocks, the maximum file
length will be 65535*512 bytes or just under 32MB (or 16MB when using
signed arithmetic). When using 2K byte blocks, the limit will be 128 or
64MB respectively.

I know mdv and flp use 512-byte block size and ED flp have 2K byte sectors
but I'm not sure if the latter also uses 2K blocks. The same goes for
(virtual) win drives - sectors are usually grouped to keep the map within
limits but I don't know off-hand if that also affects the block size (it
might as well be 512 bytes, depending on the driver).

This use of word-sized block numbers within QDOS is an unfortunate design
flaw - as is the standard FS.MDINF trap which returns word-sized sector
counts - but could TT back in 1984 foresee that within five years there
would be a storage medium for the QL that surpassed the 32MB limit? In the
PC world there are multiple examples of this - remember the 32MB partition
size limit in DOS 3.3, then the 528MB limit on CHS-addressed hard disks,
and the initial 128GB limit on LBA which was supposed to 'fix' CHS.

Storage capacity has grown so much that any 'X MB ought to be enough for
everybody' design decision has proven wrong eventually...

-- 
*Jan Bredenbeek* | Hilversum, NL | j...@bredenbeek.net
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Re: [Ql-Users] Maximum length of files on QL file-system

[Wolfgang Lenerz via Ql-Users]

Hi,

there are limits to the QLWA (i.e.qxl.win) file system, but they 
shouldn't be so small.


Basically, a file is limited to the size of the "disk" (it obviously 
can't be bigger than that) minus some overhead (for the FAT, the root 
secor and the rot directory). The QLWA system is a FAT type system. each 
entry in the FAT (called "map" in SMSQE parlance) is a word (2 bytes) 
long, so you can't reference more than 65536 clusters (or "allocation 
units"). A file could occupy all of these clusters (minus the overhead).


I just created a 400 MB QXL.win disk and copied a 200 MB file onto it. 
No problem with file size there, it's just pretty slow under SMSQmulator.


Qubide isn't that much different, except that each entry in the FAT 
takes a long word (4 bytes).



HTH

Wolfgang




Trying to transfer large files between Windows 10,
QPC2, and QL-Aurora-SGC-Qubide I have noticed that there are big
limitations in the maximum length of the files.

I mean:
- On QXL.WIN
hard drive in QPC2 I'm not able to generate files longer than 50Mb (End
Of file error)
- On the Qubide hard drive the limit is 19Mb (ROM 2.01),
but perhaps also depends on the partition creation choices

- On Ram
Disk (in QPC2 maximum RAM 128 Mb) I did not find any limits unless the
size of the RAM
- I did not find limits on DOS devices from QPC2 except
those of the file system in use on Windows (NTFS)

Specifically for
QXL.WIN and QUBIDE do anyone know the exact length limits and
why?

Thank you

Andrea Carpi


Con Mobile Open 7 GB a 9 euro/4 sett navighi veloce con 7 GB di Internet e hai 
200 minuti ed SMS a 15 cent. Passa a Tiscali Mobile! http://tisca.li/Open7GB0617

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Re: [Ql-Users] Maximum length of files on QL file-system

[Jan Bredenbeek via Ql-Users]

On 23 July 2017 at 15:47, Andrea Carpi via Ql-Users <
ql-users@lists.q-v-d.com> wrote:

>   Hello everybody
>
> Trying to transfer large files between Windows 10,
> QPC2, and QL-Aurora-SGC-Qubide I have noticed that there are big
> limitations in the maximum length of the files.
>
> I mean:
> - On QXL.WIN
> hard drive in QPC2 I'm not able to generate files longer than 50Mb (End
> Of file error)
> - On the Qubide hard drive the limit is 19Mb (ROM 2.01),
> but perhaps also depends on the partition creation choices
>
> - On Ram
> Disk (in QPC2 maximum RAM 128 Mb) I did not find any limits unless the
> size of the RAM
> - I did not find limits on DOS devices from QPC2 except
> those of the file system in use on Windows (NTFS)
>
> Specifically for
> QXL.WIN and QUBIDE do anyone know the exact length limits and
> why?
>

The QDOS file system stores the file position in the channel definition
block as two 16-bit words - one for the block number and one for the byte
position within one block. So, when using 512-byte blocks, the maximum file
length will be 65535*512 bytes or just under 32MB (or 16MB when using
signed arithmetic). When using 2K byte blocks, the limit will be 128 or
64MB respectively.

I know mdv and flp use 512-byte block size and ED flp have 2K byte sectors
but I'm not sure if the latter also uses 2K blocks. The same goes for
(virtual) win drives - sectors are usually grouped to keep the map within
limits but I don't know off-hand if that also affects the block size (it
might as well be 512 bytes, depending on the driver).

This use of word-sized block numbers within QDOS is an unfortunate design
flaw - as is the standard FS.MDINF trap which returns word-sized sector
counts - but could TT back in 1984 foresee that within five years there
would be a storage medium for the QL that surpassed the 32MB limit? In the
PC world there are multiple examples of this - remember the 32MB partition
size limit in DOS 3.3, then the 528MB limit on CHS-addressed hard disks,
and the initial 128GB limit on LBA which was supposed to 'fix' CHS.

Storage capacity has grown so much that any 'X MB ought to be enough for
everybody' design decision has proven wrong eventually...

-- 
*Jan Bredenbeek* | Hilversum, NL | j...@bredenbeek.net
___
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[Ql-Users] Maximum length of files on QL file-system

[Andrea Carpi via Ql-Users]

  Hello everybody

Trying to transfer large files between Windows 10,
QPC2, and QL-Aurora-SGC-Qubide I have noticed that there are big
limitations in the maximum length of the files.

I mean:
- On QXL.WIN
hard drive in QPC2 I'm not able to generate files longer than 50Mb (End
Of file error)
- On the Qubide hard drive the limit is 19Mb (ROM 2.01),
but perhaps also depends on the partition creation choices

- On Ram
Disk (in QPC2 maximum RAM 128 Mb) I did not find any limits unless the
size of the RAM
- I did not find limits on DOS devices from QPC2 except
those of the file system in use on Windows (NTFS)

Specifically for
QXL.WIN and QUBIDE do anyone know the exact length limits and
why?

Thank you

Andrea Carpi  


Con Mobile Open 7 GB a 9 euro/4 sett navighi veloce con 7 GB di Internet e hai 
200 minuti ed SMS a 15 cent. Passa a Tiscali Mobile! http://tisca.li/Open7GB0617

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Re: [Ql-Users] Quanta Magazine

[Michael Bulford via Ql-Users]

I've received two issues this year, up to the Feb/March issue.
None received since then.  I did email John Gilpin last week, but no reply as 
yet.


Michael
Dilwyn wrote:

> I've forwarded this to committee members (don't know the answer myself), 
> hopefully a reply soon.
>
> Dilwyn
>
> -Original Message- 
> From: sba1derson via Ql-Users
> Sent: Sunday, July 23, 2017 9:08 AM
> To: ql-us...@q-v-d.com
> Subject: [Ql-Users] Quanta Magazine
>
> Has anyone received an electronic copy of Quanta magazine since the 
> January/February 2017 issue?  I've not received one since.  I've contacted 
> Quanta via their website but so far have had no response.
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Re: [Ql-Users] PCB Design v7.52

[Dilwyn Jones via Ql-Users]

I did send a similar reply but it doesn't seem to have arrived. I copied the 
original query from Wolfgang to the author (Malcolm Lear) in case he doesn't 
read this list.


Looks like yahoo mail playing up on me again, seem to get two copies of all 
mails to the list and some of my mails don't get through. Hmm...


Dilwyn

-Original Message- 
From: Wolf via Ql-Users

Sent: Sunday, July 23, 2017 6:43 AM
To: ql-us...@q-v-d.com
Subject: Re: [Ql-Users] PCB Design v7.52

Hi Michael,


There is the -Q1 option in unzip to reverse the "_" <-> "."
Eg. EX unzip,#1; "-Q1 dos7_PCBDesign752.zip -d ram6_"
and they all come out with dots in them !



Great, thanks for pointing that out.


I have run the code and this does work well using QPC2, in extended screen 
size.




Ok, I'll have to recheck, then


WOlfgang
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Re: [Ql-Users] Quanta Magazine

[Dilwyn Jones via Ql-Users]

I've forwarded this to committee members (don't know the answer myself), 
hopefully a reply soon.


Dilwyn

-Original Message- 
From: sba1derson via Ql-Users

Sent: Sunday, July 23, 2017 9:08 AM
To: ql-us...@q-v-d.com
Subject: [Ql-Users] Quanta Magazine

Has anyone received an electronic copy of Quanta magazine since the 
January/February 2017 issue?  I've not received one since.  I've contacted 
Quanta via their website but so far have had no response.

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[Ql-Users] Quanta Magazine

[sba1derson via Ql-Users]

Has anyone received an electronic copy of Quanta magazine since the 
January/February 2017 issue?  I've not received one since.  I've contacted 
Quanta via their website but so far have had no response.
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