Home » Archimedes archive » Archimedes World » AW-1991-09.adf » AWSept91 » !AWSep91/Goodies/PD/!QRT/!Changes
!AWSep91/Goodies/PD/!QRT/!Changes
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Archimedes World » AW-1991-09.adf » AWSept91 |
| Filename: | !AWSep91/Goodies/PD/!QRT/!Changes |
| Read OK: | ✔ |
| File size: | 0412 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Changes made to QRT from version 1.5a ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1. The IMG file is now always a sprite file. It used to be a text file until it was closed. 2. If the !Config file is missing, or corrupt, a fresh copy is created with the default settings of: aspect ratio = 0.9 screen mode = 15 image size = full size 3. The multitasking has been improved so that generating sprites no longer hangs the machine at the end of each scan line. 4. Initial position of the window is now closed to being central on a mode 12 screen. 5. Initial slot size increased to reduce the possibility of QRT dying due to stack overflow - NB IF THE APPLICATION DISAPPEARS WITH THE HOURGLASS ON, IT IS PROBABLY DUE TO A STACK OVERFLOW. Known bugs ~~~~~~~~~~ 1. The Floyd-Steinberg dithering algorithm isn't quite correct but you probably wouldn't notice anything wrong. 2. QRT is still prone to stack overflows. One way to avoid this is not to have items with high reflectivity as this causes the rays to bounce around endlessly.
00000000 43 68 61 6e 67 65 73 20 6d 61 64 65 20 74 6f 20 |Changes made to | 00000010 51 52 54 20 66 72 6f 6d 20 76 65 72 73 69 6f 6e |QRT from version| 00000020 20 31 2e 35 61 0a 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e | 1.5a.~~~~~~~~~~| 00000030 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e |~~~~~~~~~~~~~~~~| 00000040 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 0a 0a 31 2e 20 |~~~~~~~~~~~..1. | 00000050 54 68 65 20 49 4d 47 20 66 69 6c 65 20 69 73 20 |The IMG file is | 00000060 6e 6f 77 20 61 6c 77 61 79 73 20 61 20 73 70 72 |now always a spr| 00000070 69 74 65 20 66 69 6c 65 2e 20 49 74 20 75 73 65 |ite file. It use| 00000080 64 20 74 6f 20 62 65 20 61 20 74 65 78 74 20 66 |d to be a text f| 00000090 69 6c 65 20 75 6e 74 69 6c 0a 69 74 20 77 61 73 |ile until.it was| 000000a0 20 63 6c 6f 73 65 64 2e 0a 0a 32 2e 20 49 66 20 | closed...2. If | 000000b0 74 68 65 20 21 43 6f 6e 66 69 67 20 66 69 6c 65 |the !Config file| 000000c0 20 69 73 20 6d 69 73 73 69 6e 67 2c 20 6f 72 20 | is missing, or | 000000d0 63 6f 72 72 75 70 74 2c 20 61 20 66 72 65 73 68 |corrupt, a fresh| 000000e0 20 63 6f 70 79 20 69 73 20 63 72 65 61 74 65 64 | copy is created| 000000f0 20 77 69 74 68 0a 74 68 65 20 64 65 66 61 75 6c | with.the defaul| 00000100 74 20 73 65 74 74 69 6e 67 73 20 6f 66 3a 0a 0a |t settings of:..| 00000110 20 20 20 61 73 70 65 63 74 20 72 61 74 69 6f 20 | aspect ratio | 00000120 3d 20 30 2e 39 0a 20 20 20 73 63 72 65 65 6e 20 |= 0.9. screen | 00000130 6d 6f 64 65 20 20 3d 20 31 35 0a 20 20 20 69 6d |mode = 15. im| 00000140 61 67 65 20 73 69 7a 65 20 20 20 3d 20 66 75 6c |age size = ful| 00000150 6c 20 73 69 7a 65 0a 0a 33 2e 20 54 68 65 20 6d |l size..3. The m| 00000160 75 6c 74 69 74 61 73 6b 69 6e 67 20 68 61 73 20 |ultitasking has | 00000170 62 65 65 6e 20 69 6d 70 72 6f 76 65 64 20 73 6f |been improved so| 00000180 20 74 68 61 74 20 67 65 6e 65 72 61 74 69 6e 67 | that generating| 00000190 20 73 70 72 69 74 65 73 20 6e 6f 20 6c 6f 6e 67 | sprites no long| 000001a0 65 72 0a 68 61 6e 67 73 20 74 68 65 20 6d 61 63 |er.hangs the mac| 000001b0 68 69 6e 65 20 61 74 20 74 68 65 20 65 6e 64 20 |hine at the end | 000001c0 6f 66 20 65 61 63 68 20 73 63 61 6e 20 6c 69 6e |of each scan lin| 000001d0 65 2e 0a 0a 34 2e 20 49 6e 69 74 69 61 6c 20 70 |e...4. Initial p| 000001e0 6f 73 69 74 69 6f 6e 20 6f 66 20 74 68 65 20 77 |osition of the w| 000001f0 69 6e 64 6f 77 20 69 73 20 6e 6f 77 20 63 6c 6f |indow is now clo| 00000200 73 65 64 20 74 6f 20 62 65 69 6e 67 20 63 65 6e |sed to being cen| 00000210 74 72 61 6c 20 6f 6e 20 61 20 6d 6f 64 65 0a 31 |tral on a mode.1| 00000220 32 20 73 63 72 65 65 6e 2e 0a 0a 35 2e 20 49 6e |2 screen...5. In| 00000230 69 74 69 61 6c 20 73 6c 6f 74 20 73 69 7a 65 20 |itial slot size | 00000240 69 6e 63 72 65 61 73 65 64 20 74 6f 20 72 65 64 |increased to red| 00000250 75 63 65 20 74 68 65 20 70 6f 73 73 69 62 69 6c |uce the possibil| 00000260 69 74 79 20 6f 66 20 51 52 54 20 64 79 69 6e 67 |ity of QRT dying| 00000270 20 64 75 65 20 74 6f 0a 73 74 61 63 6b 20 6f 76 | due to.stack ov| 00000280 65 72 66 6c 6f 77 20 2d 20 4e 42 20 49 46 20 54 |erflow - NB IF T| 00000290 48 45 20 41 50 50 4c 49 43 41 54 49 4f 4e 20 44 |HE APPLICATION D| 000002a0 49 53 41 50 50 45 41 52 53 20 57 49 54 48 20 54 |ISAPPEARS WITH T| 000002b0 48 45 20 48 4f 55 52 47 4c 41 53 53 20 4f 4e 2c |HE HOURGLASS ON,| 000002c0 20 49 54 0a 49 53 20 50 52 4f 42 41 42 4c 59 20 | IT.IS PROBABLY | 000002d0 44 55 45 20 54 4f 20 41 20 53 54 41 43 4b 20 4f |DUE TO A STACK O| 000002e0 56 45 52 46 4c 4f 57 2e 0a 0a 4b 6e 6f 77 6e 20 |VERFLOW...Known | 000002f0 62 75 67 73 0a 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 0a |bugs.~~~~~~~~~~.| 00000300 0a 31 2e 20 54 68 65 20 46 6c 6f 79 64 2d 53 74 |.1. The Floyd-St| 00000310 65 69 6e 62 65 72 67 20 64 69 74 68 65 72 69 6e |einberg ditherin| 00000320 67 20 61 6c 67 6f 72 69 74 68 6d 20 69 73 6e 27 |g algorithm isn'| 00000330 74 20 71 75 69 74 65 20 63 6f 72 72 65 63 74 20 |t quite correct | 00000340 62 75 74 20 79 6f 75 0a 70 72 6f 62 61 62 6c 79 |but you.probably| 00000350 20 77 6f 75 6c 64 6e 27 74 20 6e 6f 74 69 63 65 | wouldn't notice| 00000360 20 61 6e 79 74 68 69 6e 67 20 77 72 6f 6e 67 2e | anything wrong.| 00000370 0a 0a 32 2e 20 51 52 54 20 69 73 20 73 74 69 6c |..2. QRT is stil| 00000380 6c 20 70 72 6f 6e 65 20 74 6f 20 73 74 61 63 6b |l prone to stack| 00000390 20 6f 76 65 72 66 6c 6f 77 73 2e 20 4f 6e 65 20 | overflows. One | 000003a0 77 61 79 20 74 6f 20 61 76 6f 69 64 20 74 68 69 |way to avoid thi| 000003b0 73 20 69 73 20 6e 6f 74 20 74 6f 0a 68 61 76 65 |s is not to.have| 000003c0 20 69 74 65 6d 73 20 77 69 74 68 20 68 69 67 68 | items with high| 000003d0 20 72 65 66 6c 65 63 74 69 76 69 74 79 20 61 73 | reflectivity as| 000003e0 20 74 68 69 73 20 63 61 75 73 65 73 20 74 68 65 | this causes the| 000003f0 20 72 61 79 73 20 74 6f 20 62 6f 75 6e 63 65 20 | rays to bounce | 00000400 61 72 6f 75 6e 64 0a 65 6e 64 6c 65 73 73 6c 79 |around.endlessly| 00000410 2e 0a |..| 00000412
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