Re: [Ql-Users] Job data space - foibles?
Sorry about possible format problems, I'm on my phone. Hi Marcel, My file size is 30 bytes. I checked. Default data space from GWASL is 4000 bytes. I expected that to end up as 4030 or possibly rounded to the nearest 8 or 16 which would be 4032. Hence my confusion as 4042 is not divisible by 8 or 16. Cheers, Norm. Ps. Yes it's 5 mins for someone who knows their way around the source ;-) ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
nor...@dunbar-it.co.uk wrote: My file size is 30 bytes. I checked. Default data space from GWASL is 4000 bytes. I expected that to end up as 4030 or possibly rounded to the nearest 8 or 16 which would be 4032. What's the value of a4 then? My test exe was 1024 bytes data space and 222 bytes EXE and A5 was exactly 1246. Of course it depends on the way the EXE is started, as the values given to SMS.CRJB are directly used. JMON (my way) obviously didn't do any rounding, but others might. Ps. Yes it's 5 mins for someone who knows their way around the source ;-) You overestimate my knowledge of the code, I just know how to use FiFi ;) Marcel ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
A4 is $1e. I execute the job simply as ex test_bin. JMON picks it up at startup. Sent from my HTC ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
On 7 Oct 2013, at 20:36, Norman Dunbar wrote: Evening all, I'm experimenting for the first exciting episode of the new assembly language mailing list. It's the first time I've sat down with QPC since I started my new job! I have noticed something a little odd, well, even to be honest. Strangely enough, the answer is 42 - what is the question? ;-) Seriously, when I create a job with any given dataspace, when the job is activated, A5.L is always set to that data space value plus 42 extra bytes. There's nothing in the QDOS docs (from Jochen) nor in Dickens or Pennell. The closest I have found is in Pennell on page 20 where he says that ... TRNSP is expanded by D2+D3+$68, memory permitting when a job is created. D2 is the code size, D3 is the requested dataspace size and the extra $68 is for the standard job header area. I'm wondering if the mysterious 42 extra bytes is also accumulated in the space desired in TRNSP (it has to be D2+D3+$68+42 or stuff would crash!) but where does it come from? I cannot see it as being a rounding to the nearest 16 or 8 or whatever, because it's always 42. When I say always, I have tried the same job with the following dataspace sizes, and every one set A5 to be 42 extra: 126, 256, 500, 512, 1000, 1024, 2000, 2048, 3000, 3172, 4000, 4096. I could, I suppose, look up the source for SMSQ but I don;t, sadly, have the time at the moment. Not after doing all the above testing! I'm afraid I shall be lazy and rely on the good will and knowledge of the list for answers. Thanks in advance. Cheers, Norm. Pennel says that (A6,A4) points to the start of data and (A6,A5) points to immediately past the data area end. This implies that the size of the data space is A5 - A4. Having experimented with a program having no parameter list and no channels on being executed, I found that there always was an excess of A5 - A4 over the data space requested in the program. In my case the excess was always positive, always even and never 42. The excess ranged from 12 to 34. George ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
On 07/10/13 21:18, Lee Privett wrote: PRINT the_answer_to_life_the_universe_and_everything ... Ok, I'm game PRINT the_answer_to_life_the_universe_and_everything 0 Print CODE(0) 48 What am I missing? -- Norman Dunbar Dunbar IT Consultants Ltd Registered address: 27a Lidget Hill Pudsey West Yorkshire United Kingdom LS28 7LG Company Number: 05132767 ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Programming in Assembler
Hi Jochen, On 07/10/13 23:43, jms1 wrote: Please include me in your mailing of further instalments of Programming in Assembler if you go here http://qdosmsq.dunbar-it.co.uk/doku.php#assembly_language_mailing_list there are details on how to subscribe - copied below: Assembly Language Mailing List With the [impending] demise of the last, known, surviving QL magazine in print, there is unlikely to be a printed copy of the remainder of my series on Assembly Language. As the series is not yet finished, and we are slap bang in the middle of a new (potentially useful) LibGen utility, my long time reader(s) may wish to complete the application. If so, please subscribe to my mailing list so that you can be kept up to date as and when I create new articles. The hope is that I will send out an email to all subscribers who wish to follow the series, and the email will contain a link to a pdf version of the article. I also have plans to combine everything done so far over the years into a “book” and make that available for download too. That work is quite close to completion. You can subscribe at http://qdosmsq.dunbar-it.co.uk/mailinglist. Please note, that I ask for your name as part of the subscription process, this is to try and stop spam bots from subscribing. I get a lot of those. You click the link and the on the next link that says subscribe to our newsletters. Then you fill in all the details requested in red. And tick the box to indicate that yo want to subscribe to the QDOSMSQ Assembly Language newsletter and click the subscribe button. (Phew!) Cheers, Norm. -- Norman Dunbar Dunbar IT Consultants Ltd Registered address: 27a Lidget Hill Pudsey West Yorkshire United Kingdom LS28 7LG Company Number: 05132767 ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Programming in Assembler
On 07/10/13 23:43, jms1 wrote: Please include me in your mailing of further instalments of Programming in Assembler PS. Then you get an email sent to you asking you to confirm your subscription request. If you don't get one, it will be in your spam bucket and you may need to whitelist me. Cheers, Norm. -- Norman Dunbar Dunbar IT Consultants Ltd Registered address: 27a Lidget Hill Pudsey West Yorkshire United Kingdom LS28 7LG Company Number: 05132767 ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
On 08/10/13 17:21, George Gwilt wrote: Pennel says that (A6,A4) points to the start of data and (A6,A5) points to immediately past the data area end. This implies that the size of the data space is A5 - A4. Yes, A4 is actually the program size, which in my case is 30 bytes only. It's not a complicated program: begin bra.s start dc.l0 dc.w$4afb dc.w8 dc.b'Test Job' start moveq #8,d0 moveq #-1,d1 moveq #10,d3 suba.l a1,a1 trap#1 bra.s start Assembled with GWASL I get a file of 30 bytes and a data space of 4000. What Marcel (and you) say makes perfect sense. If the job starts at the address A6 points to, and is 30 bytes long, then the start of the data space must be A6+30 and as A4 holds the value $1e, that's correct. I would imagine that A5, on the other hand should hold the address of A6+30+4000 which would be correct in my case, but I get the extra 12 bytes. 4000 is exactly divisible by 2, 4, 8, 16 or 32 in the powers of two range. I think QDOSMSQ rounds some memory allocations to the next 8 but I can't remember if it rounds anything to the next 16. 4030 is divisible by 2. 4042 is divisible by 2, and not much else! Maybe it's to do with the size of the code file on disc? I changed the source to add a buffer of 64 words, taking me up to a file size of 158 bytes. This time, when executed, A4 is $9E (aka 158) which is exactly the size of the code file, as expected. A5 is 4000+158+12, which is exactly 12 bytes more than the data + code size - and matches up to what I was already seeing. In my code size 30 example, I get 42 which is an extra 12 as well. What's so special about 12 I wonder? insert delay while I rummage in the source code Right, it must be something in the allocation of memory. I found the code that creates a job and it simply allocates memory for #jcb_end+d2+d3 and jcb_end is $68. This is what it requests of the memory allocation code - so whatever is being allocated must be coming from that. I can live with this. It was something unusual that I came across, and I think it's explained adequately now. Thanks to all who replied. Cheers, Norm. -- Norman Dunbar Dunbar IT Consultants Ltd Registered address: 27a Lidget Hill Pudsey West Yorkshire United Kingdom LS28 7LG Company Number: 05132767 ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
Re: [Ql-Users] Job data space - foibles?
Hee he, it has to be on a standard QL Norman. Or on QemuLator standard QL settings You shouldn't get a 0, but another * Sent from my iPad On 8 Oct 2013, at 17:56, Norman Dunbar nor...@dunbar-it.co.uk wrote: universe ___ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
