English Amiga Board Amiga Lore



Go Back   English Amiga Board > Other Projects > project.TOSEC (amiga only)

 
 
Thread Tools
Old 25 June 2012, 00:44   #61
prowler
Global Moderator
prowler's Avatar
 
Join Date: Aug 2008
Location: Sidcup, England
Posts: 9,500
Well, finally, here is some better news.

A brief summary of what I have achieved over the last few days:

Despite still having captured nothing but corrupted rubbish from Disk Block 116, I think I'm on the brink of recovering the Calc program.

The closely matching data I found for Disk Block 116 in the Advantage Disk 2[a] image in TOSEC turned out to be from the English version of the Calc program.

Initially, I estimated the degree of closeness of these blocks of data by noting that the next block of data on each disk differs by only four bytes.

And so it has proved to be. After many, many captures from the Office Disk's Block 116 I have established the likelihood that the bulk of the replacement data I am using is correct and that there are just four bytes (the same number of discrepancies as in the next block) which do not match.

I appreciate that it would still take a huge amount of effort to establish the correct data for these four bytes using a brute force method, but I can now conduct a fresh analysis of the captures I have made so far to predict them on a maximum likelihood basis, plus I may yet find a disk drive which can read that block more effectively.

The Graph program on the Office disk also has a data block which closely matches Disk Block 116 (though not quite as closely as the English Calc program's), and there is also an English version of the Graph program in the Advantage Disk 2[a] image in TOSEC. This program has a five bytes discrepancy between the Portuguese and English versions both in the relevant data block and the next one, and both files are intact!

I intend to do some comparisons between the Portuguese and English versions of both the Calc and Graph programs, to see if I can discover the reason for the discrepancies, which would probably enable me to establish the correct data for the four bytes in Disk Block 116 without any guesswork.

Last edited by prowler; 25 June 2012 at 00:50.
prowler is offline  
AdSense AdSense  
Advertisement:
Old 28 June 2012, 14:48   #62
HymnsomniaK
Onezay Riendfay
HymnsomniaK's Avatar
 
Join Date: Apr 2006
Location: Portugal
Age: 35
Posts: 119
Is there no end to your bag of tricks? Nice work.
HymnsomniaK is offline  
Old 29 June 2012, 00:53   #63
prowler
Global Moderator
prowler's Avatar
 
Join Date: Aug 2008
Location: Sidcup, England
Posts: 9,500
I have made some more progress since then.

In fact, I have just this minute completed my first iteration for the data in Disk Block 116, which I can't wait until tomorrow to try out, so I'll be firing up the emulator before I go to bed tonight!
prowler is offline  
Old 29 June 2012, 22:32   #64
prowler
Global Moderator
prowler's Avatar
 
Join Date: Aug 2008
Location: Sidcup, England
Posts: 9,500
Quote:
Originally Posted by prowler View Post
I have just this minute completed my first iteration for the data in Disk Block 116, which I can't wait until tomorrow to try out, so I'll be firing up the emulator before I go to bed tonight!
Well, just before 01:00 this morning, I tried the Calc program from the Office disk image with four new bytes pasted into Disk Block 116 and it loaded up fine! (No Guru! )

However, it's not fixed yet. The program hangs when cancelling the Open file dialog box, and the emulation resets when quitting the program.

So, now it's time to get some fresh data using a few more drives...
prowler is offline  
Old 02 July 2012, 00:41   #65
HymnsomniaK
Onezay Riendfay
HymnsomniaK's Avatar
 
Join Date: Apr 2006
Location: Portugal
Age: 35
Posts: 119
Nice work as always. Can't wait to test as soon as it's ready.
HymnsomniaK is offline  
AdSense AdSense  
Advertisement:
 


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
New Amiga Room/Office :) fitzsteve Hardware pics 10 06 June 2012 06:11
tosec.amiga.me (Your New TOSEC Source) is open! Magix News 31 19 March 2009 18:03
Compatibility with Amiga 500 and 500+ games ErickDF Amiga scene 2 23 May 2008 20:16
WTB: Amiga 600, 500, 500 +, 1200 (NTSC) JeremyDay MarketPlace 2 30 November 2006 03:27
AMIGAplus 12/2004 (#153) - Amiga Office Paul News 0 03 December 2004 17:29

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 10:15.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Page generated in 0.10731 seconds with 14 queries