Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_21B.ADF » P/A/anim1
P/A/anim1
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 » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_21B.ADF |
Filename: | P/A/anim1 |
Read OK: | ✔ |
File size: | 0B7C bytes |
Load address: | 24204556 |
Exec address: | 696E612E |
File contents
ANIMATION ~~~~~~~~~ By Richard Dimond These are five samples of animation which were originally published in Acornuser (Dec 1992) to demonstrate the compression routines which I gave in my article (EUG 18). As published, the programs would not run with PAGE greater than &1100 as HIMEM needs to be lowered to between &1700 and &1F00. I have now modified the programs so that they download to &E00. Each program builds up a series of screens which are then compressed and SAVEd in sequence above HIMEM. They are then expanded and displayed to give the animation. The programs needed changes since the M/code must be *LOADed before the program is downloaded. I have also provided a Quick Demo mode. The compressed screen files are SAVEd in the files DAT1,... and when these are LOADed, the demo will run. This saves the time taken for the data to be built up which can be up to half an hour or more!! Numbers 3 and 4 are the quickest. With some of the demos, this data runs into the screen area and only the lower part of the screen is used for the demo. For a quick demo, press Y before selecting the demo. If you have PAGE at &E00 you can press a key to return to the menu for a further demo. If the program downloads, you will need to press Ctrl/Brk and set up again. PROGRAM NOTES ~~~~~~~~~~~~~ I have used two integer variables as flags, M% to indicate whether PAGE is greater than &1100 and D% for the Quick demo mode. If PAGE is lower than &1100 M% is FALSE and the programs run normally with the M/code LOADing at line 140 and if D% is TRUE the programs skip the procedures for building up and displaying the screens to LOAD the data files line 1020 and then run the demo. With PAGE greater than &1100 the programs jump to line 2000. M% is now TRUE and the M/code is LOADed at line 2020. If D% is FALSE then the program goes to line 2080 and then downloads and runs as normally with the screens building up. With PAGE at &1D00, the data files need to be LOADed to &2A00 and then downloaded to their correct address after the BASIC program has been downloaded. This proved to be rather tricky as they all now ran into the screen area. The MODE must be set initially and not after downloading (line 60). HIMEM must be first set as high as possible and a text window set above this to prevent the files being corrupted. The downloading is done by a short M/code routine added to the compressiom routines at &9EE. The addresses for this are set at line 2050 and the routine CALLed at line 75 after downloading. A further point is that the memory must be cleared on pressing Ctrl/Brk as I found that, on selecting another demo after a Ctrl/Brk, the demo was misplaced. I have included the *FX200,3 call at line 2010 to clear memory so that the demos are correctly shown. **************************************************************************
00000000 0d 41 4e 49 4d 41 54 49 4f 4e 0d 7e 7e 7e 7e 7e |.ANIMATION.~~~~~| 00000010 7e 7e 7e 7e 0d 42 79 20 52 69 63 68 61 72 64 20 |~~~~.By Richard | 00000020 44 69 6d 6f 6e 64 0d 0d 54 68 65 73 65 1a 20 61 |Dimond..These. a| 00000030 72 65 1a 20 66 69 76 65 1a 20 73 61 6d 70 6c 65 |re. five. sample| 00000040 73 1a 20 6f 66 20 61 6e 69 6d 61 74 69 6f 6e 20 |s. of animation | 00000050 77 68 69 63 68 20 77 65 72 65 20 6f 72 69 67 69 |which were origi| 00000060 6e 61 6c 6c 79 20 70 75 62 6c 69 73 68 65 64 20 |nally published | 00000070 69 6e 0d 41 63 6f 72 6e 75 73 65 72 20 28 44 65 |in.Acornuser (De| 00000080 63 20 31 39 39 32 29 20 74 6f 20 64 65 6d 6f 6e |c 1992) to demon| 00000090 73 74 72 61 74 65 1a 20 74 68 65 20 63 6f 6d 70 |strate. the comp| 000000a0 72 65 73 73 69 6f 6e 20 72 6f 75 74 69 6e 65 73 |ression routines| 000000b0 20 77 68 69 63 68 20 49 20 67 61 76 65 0d 69 6e | which I gave.in| 000000c0 20 6d 79 20 61 72 74 69 63 6c 65 20 28 45 55 47 | my article (EUG| 000000d0 20 31 38 29 2e 20 20 41 73 1a 20 70 75 62 6c 69 | 18). As. publi| 000000e0 73 68 65 64 2c 1a 20 74 68 65 1a 20 70 72 6f 67 |shed,. the. prog| 000000f0 72 61 6d 73 1a 20 77 6f 75 6c 64 20 6e 6f 74 20 |rams. would not | 00000100 72 75 6e 20 77 69 74 68 0d 50 41 47 45 20 67 72 |run with.PAGE gr| 00000110 65 61 74 65 72 20 74 68 61 6e 20 26 31 31 30 30 |eater than &1100| 00000120 20 61 73 1a 20 48 49 4d 45 4d 20 6e 65 65 64 73 | as. HIMEM needs| 00000130 20 74 6f 20 62 65 20 6c 6f 77 65 72 65 64 20 74 | to be lowered t| 00000140 6f 20 62 65 74 77 65 65 6e 20 26 31 37 30 30 20 |o between &1700 | 00000150 61 6e 64 0d 26 31 46 30 30 2e 20 20 49 20 68 61 |and.&1F00. I ha| 00000160 76 65 20 6e 6f 77 20 6d 6f 64 69 66 69 65 64 20 |ve now modified | 00000170 74 68 65 20 70 72 6f 67 72 61 6d 73 20 73 6f 20 |the programs so | 00000180 74 68 61 74 20 74 68 65 79 20 64 6f 77 6e 6c 6f |that they downlo| 00000190 61 64 20 74 6f 20 26 45 30 30 2e 20 0d 0d 45 61 |ad to &E00. ..Ea| 000001a0 63 68 20 70 72 6f 67 72 61 6d 20 62 75 69 6c 64 |ch program build| 000001b0 73 20 75 70 20 61 20 73 65 72 69 65 73 20 6f 66 |s up a series of| 000001c0 20 73 63 72 65 65 6e 73 20 77 68 69 63 68 20 61 | screens which a| 000001d0 72 65 20 74 68 65 6e 1a 20 63 6f 6d 70 72 65 73 |re then. compres| 000001e0 73 65 64 1a 20 61 6e 64 0d 53 41 56 45 64 20 69 |sed. and.SAVEd i| 000001f0 6e 20 73 65 71 75 65 6e 63 65 20 61 62 6f 76 65 |n sequence above| 00000200 20 48 49 4d 45 4d 2e 1a 20 54 68 65 79 1a 20 61 | HIMEM.. They. a| 00000210 72 65 1a 20 74 68 65 6e 1a 20 65 78 70 61 6e 64 |re. then. expand| 00000220 65 64 20 61 6e 64 20 64 69 73 70 6c 61 79 65 64 |ed and displayed| 00000230 20 74 6f 0d 67 69 76 65 20 74 68 65 20 61 6e 69 | to.give the ani| 00000240 6d 61 74 69 6f 6e 2e 0d 0d 54 68 65 20 70 72 6f |mation...The pro| 00000250 67 72 61 6d 73 20 6e 65 65 64 65 64 20 63 68 61 |grams needed cha| 00000260 6e 67 65 73 20 73 69 6e 63 65 1a 20 74 68 65 1a |nges since. the.| 00000270 20 4d 2f 63 6f 64 65 20 6d 75 73 74 20 62 65 1a | M/code must be.| 00000280 20 2a 4c 4f 41 44 65 64 20 62 65 66 6f 72 65 20 | *LOADed before | 00000290 74 68 65 0d 70 72 6f 67 72 61 6d 20 69 73 20 64 |the.program is d| 000002a0 6f 77 6e 6c 6f 61 64 65 64 2e 20 20 49 20 68 61 |ownloaded. I ha| 000002b0 76 65 1a 20 61 6c 73 6f 1a 20 70 72 6f 76 69 64 |ve. also. provid| 000002c0 65 64 1a 20 61 1a 20 51 75 69 63 6b 1a 20 44 65 |ed. a. Quick. De| 000002d0 6d 6f 1a 20 6d 6f 64 65 2e 20 20 54 68 65 0d 63 |mo. mode. The.c| 000002e0 6f 6d 70 72 65 73 73 65 64 1a 20 20 73 63 72 65 |ompressed. scre| 000002f0 65 6e 1a 20 66 69 6c 65 73 1a 20 61 72 65 20 53 |en. files. are S| 00000300 41 56 45 64 20 69 6e 20 74 68 65 20 66 69 6c 65 |AVEd in the file| 00000310 73 20 44 41 54 31 2c 2e 2e 2e 20 61 6e 64 20 77 |s DAT1,... and w| 00000320 68 65 6e 20 74 68 65 73 65 0d 61 72 65 20 4c 4f |hen these.are LO| 00000330 41 44 65 64 2c 20 74 68 65 20 64 65 6d 6f 1a 20 |ADed, the demo. | 00000340 77 69 6c 6c 1a 20 72 75 6e 2e 20 54 68 69 73 20 |will. run. This | 00000350 73 61 76 65 73 20 74 68 65 20 74 69 6d 65 20 74 |saves the time t| 00000360 61 6b 65 6e 20 66 6f 72 20 74 68 65 20 64 61 74 |aken for the dat| 00000370 61 20 74 6f 0d 62 65 20 62 75 69 6c 74 20 75 70 |a to.be built up| 00000380 20 77 68 69 63 68 20 63 61 6e 20 62 65 20 75 70 | which can be up| 00000390 20 74 6f 20 68 61 6c 66 20 61 6e 20 68 6f 75 72 | to half an hour| 000003a0 20 6f 72 20 6d 6f 72 65 21 21 20 20 4e 75 6d 62 | or more!! Numb| 000003b0 65 72 73 20 33 20 61 6e 64 20 34 20 61 72 65 0d |ers 3 and 4 are.| 000003c0 74 68 65 20 71 75 69 63 6b 65 73 74 2e 20 20 57 |the quickest. W| 000003d0 69 74 68 20 73 6f 6d 65 20 6f 66 20 74 68 65 20 |ith some of the | 000003e0 64 65 6d 6f 73 2c 20 74 68 69 73 20 64 61 74 61 |demos, this data| 000003f0 20 72 75 6e 73 20 69 6e 74 6f 20 74 68 65 20 73 | runs into the s| 00000400 63 72 65 65 6e 20 61 72 65 61 0d 61 6e 64 20 6f |creen area.and o| 00000410 6e 6c 79 20 74 68 65 20 6c 6f 77 65 72 20 70 61 |nly the lower pa| 00000420 72 74 20 6f 66 20 74 68 65 20 73 63 72 65 65 6e |rt of the screen| 00000430 20 69 73 20 75 73 65 64 20 66 6f 72 20 74 68 65 | is used for the| 00000440 20 64 65 6d 6f 2e 0d 0d 46 6f 72 20 61 20 71 75 | demo...For a qu| 00000450 69 63 6b 20 64 65 6d 6f 2c 20 70 72 65 73 73 20 |ick demo, press | 00000460 59 20 62 65 66 6f 72 65 20 73 65 6c 65 63 74 69 |Y before selecti| 00000470 6e 67 20 74 68 65 20 64 65 6d 6f 2e 20 20 49 66 |ng the demo. If| 00000480 1a 20 79 6f 75 20 68 61 76 65 20 50 41 47 45 20 |. you have PAGE | 00000490 61 74 0d 26 45 30 30 20 79 6f 75 20 63 61 6e 20 |at.&E00 you can | 000004a0 70 72 65 73 73 20 61 20 6b 65 79 20 74 6f 20 72 |press a key to r| 000004b0 65 74 75 72 6e 20 74 6f 20 74 68 65 20 6d 65 6e |eturn to the men| 000004c0 75 20 66 6f 72 20 61 20 66 75 72 74 68 65 72 20 |u for a further | 000004d0 64 65 6d 6f 2e 20 20 49 66 20 74 68 65 0d 70 72 |demo. If the.pr| 000004e0 6f 67 72 61 6d 20 64 6f 77 6e 6c 6f 61 64 73 2c |ogram downloads,| 000004f0 20 79 6f 75 20 77 69 6c 6c 20 6e 65 65 64 20 74 | you will need t| 00000500 6f 20 70 72 65 73 73 20 43 74 72 6c 2f 42 72 6b |o press Ctrl/Brk| 00000510 20 61 6e 64 20 73 65 74 20 75 70 20 61 67 61 69 | and set up agai| 00000520 6e 2e 0d 0d 50 52 4f 47 52 41 4d 20 4e 4f 54 45 |n...PROGRAM NOTE| 00000530 53 0d 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 7e 0d |S.~~~~~~~~~~~~~.| 00000540 49 20 68 61 76 65 20 75 73 65 64 20 74 77 6f 20 |I have used two | 00000550 69 6e 74 65 67 65 72 20 76 61 72 69 61 62 6c 65 |integer variable| 00000560 73 20 61 73 20 66 6c 61 67 73 2c 20 4d 25 20 74 |s as flags, M% t| 00000570 6f 20 69 6e 64 69 63 61 74 65 20 77 68 65 74 68 |o indicate wheth| 00000580 65 72 20 50 41 47 45 20 69 73 0d 67 72 65 61 74 |er PAGE is.great| 00000590 65 72 20 74 68 61 6e 20 26 31 31 30 30 20 61 6e |er than &1100 an| 000005a0 64 20 44 25 20 66 6f 72 20 74 68 65 20 51 75 69 |d D% for the Qui| 000005b0 63 6b 20 64 65 6d 6f 20 6d 6f 64 65 2e 0d 0d 49 |ck demo mode...I| 000005c0 66 20 50 41 47 45 20 69 73 20 6c 6f 77 65 72 20 |f PAGE is lower | 000005d0 74 68 61 6e 20 26 31 31 30 30 20 4d 25 20 69 73 |than &1100 M% is| 000005e0 20 46 41 4c 53 45 20 61 6e 64 20 74 68 65 20 70 | FALSE and the p| 000005f0 72 6f 67 72 61 6d 73 20 72 75 6e 20 6e 6f 72 6d |rograms run norm| 00000600 61 6c 6c 79 20 77 69 74 68 0d 74 68 65 20 4d 2f |ally with.the M/| 00000610 63 6f 64 65 20 4c 4f 41 44 69 6e 67 1a 20 61 74 |code LOADing. at| 00000620 1a 20 6c 69 6e 65 1a 20 31 34 30 1a 20 61 6e 64 |. line. 140. and| 00000630 20 69 66 20 44 25 20 69 73 20 54 52 55 45 20 74 | if D% is TRUE t| 00000640 68 65 20 70 72 6f 67 72 61 6d 73 20 73 6b 69 70 |he programs skip| 00000650 20 74 68 65 0d 70 72 6f 63 65 64 75 72 65 73 20 | the.procedures | 00000660 66 6f 72 20 62 75 69 6c 64 69 6e 67 20 75 70 20 |for building up | 00000670 61 6e 64 1a 20 64 69 73 70 6c 61 79 69 6e 67 1a |and. displaying.| 00000680 20 74 68 65 1a 20 73 63 72 65 65 6e 73 1a 20 74 | the. screens. t| 00000690 6f 20 4c 4f 41 44 20 74 68 65 20 64 61 74 61 0d |o LOAD the data.| 000006a0 66 69 6c 65 73 20 6c 69 6e 65 20 31 30 32 30 20 |files line 1020 | 000006b0 61 6e 64 20 74 68 65 6e 20 72 75 6e 20 74 68 65 |and then run the| 000006c0 20 64 65 6d 6f 2e 0d 0d 57 69 74 68 20 50 41 47 | demo...With PAG| 000006d0 45 20 67 72 65 61 74 65 72 20 74 68 61 6e 20 26 |E greater than &| 000006e0 31 31 30 30 20 74 68 65 20 70 72 6f 67 72 61 6d |1100 the program| 000006f0 73 20 6a 75 6d 70 20 74 6f 20 6c 69 6e 65 20 32 |s jump to line 2| 00000700 30 30 30 2e 20 20 4d 25 20 69 73 20 6e 6f 77 0d |000. M% is now.| 00000710 54 52 55 45 20 61 6e 64 20 74 68 65 20 4d 2f 63 |TRUE and the M/c| 00000720 6f 64 65 20 69 73 1a 20 4c 4f 41 44 65 64 1a 20 |ode is. LOADed. | 00000730 61 74 1a 20 6c 69 6e 65 1a 20 32 30 32 30 2e 1a |at. line. 2020..| 00000740 20 20 49 66 1a 20 44 25 20 69 73 20 46 41 4c 53 | If. D% is FALS| 00000750 45 20 74 68 65 6e 20 74 68 65 0d 70 72 6f 67 72 |E then the.progr| 00000760 61 6d 20 67 6f 65 73 20 74 6f 20 6c 69 6e 65 20 |am goes to line | 00000770 32 30 38 30 20 61 6e 64 20 74 68 65 6e 20 64 6f |2080 and then do| 00000780 77 6e 6c 6f 61 64 73 20 61 6e 64 20 72 75 6e 73 |wnloads and runs| 00000790 20 61 73 20 6e 6f 72 6d 61 6c 6c 79 20 77 69 74 | as normally wit| 000007a0 68 20 74 68 65 0d 73 63 72 65 65 6e 73 20 62 75 |h the.screens bu| 000007b0 69 6c 64 69 6e 67 20 75 70 2e 0d 0d 57 69 74 68 |ilding up...With| 000007c0 1a 20 50 41 47 45 1a 20 61 74 1a 20 26 31 44 30 |. PAGE. at. &1D0| 000007d0 30 2c 1a 20 74 68 65 20 64 61 74 61 20 66 69 6c |0,. the data fil| 000007e0 65 73 20 6e 65 65 64 20 74 6f 20 62 65 20 4c 4f |es need to be LO| 000007f0 41 44 65 64 20 74 6f 20 26 32 41 30 30 20 61 6e |ADed to &2A00 an| 00000800 64 20 74 68 65 6e 0d 64 6f 77 6e 6c 6f 61 64 65 |d then.downloade| 00000810 64 20 74 6f 20 74 68 65 69 72 20 63 6f 72 72 65 |d to their corre| 00000820 63 74 20 61 64 64 72 65 73 73 20 61 66 74 65 72 |ct address after| 00000830 1a 20 74 68 65 1a 20 42 41 53 49 43 1a 20 70 72 |. the. BASIC. pr| 00000840 6f 67 72 61 6d 1a 20 68 61 73 1a 20 62 65 65 6e |ogram. has. been| 00000850 0d 64 6f 77 6e 6c 6f 61 64 65 64 2e 1a 20 20 54 |.downloaded.. T| 00000860 68 69 73 20 70 72 6f 76 65 64 20 74 6f 20 62 65 |his proved to be| 00000870 20 72 61 74 68 65 72 20 74 72 69 63 6b 79 20 61 | rather tricky a| 00000880 73 20 74 68 65 79 20 61 6c 6c 20 6e 6f 77 20 72 |s they all now r| 00000890 61 6e 20 69 6e 74 6f 20 74 68 65 0d 73 63 72 65 |an into the.scre| 000008a0 65 6e 20 61 72 65 61 2e 0d 0d 54 68 65 20 4d 4f |en area...The MO| 000008b0 44 45 20 6d 75 73 74 20 62 65 20 73 65 74 1a 20 |DE must be set. | 000008c0 69 6e 69 74 69 61 6c 6c 79 20 61 6e 64 20 6e 6f |initially and no| 000008d0 74 20 61 66 74 65 72 20 64 6f 77 6e 6c 6f 61 64 |t after download| 000008e0 69 6e 67 20 28 6c 69 6e 65 20 36 30 29 2e 20 48 |ing (line 60). H| 000008f0 49 4d 45 4d 0d 6d 75 73 74 20 62 65 20 66 69 72 |IMEM.must be fir| 00000900 73 74 20 73 65 74 20 61 73 1a 20 68 69 67 68 20 |st set as. high | 00000910 61 73 20 70 6f 73 73 69 62 6c 65 20 61 6e 64 20 |as possible and | 00000920 61 20 74 65 78 74 20 77 69 6e 64 6f 77 20 73 65 |a text window se| 00000930 74 20 61 62 6f 76 65 20 74 68 69 73 20 74 6f 0d |t above this to.| 00000940 70 72 65 76 65 6e 74 20 74 68 65 20 66 69 6c 65 |prevent the file| 00000950 73 20 62 65 69 6e 67 20 63 6f 72 72 75 70 74 65 |s being corrupte| 00000960 64 2e 0d 0d 54 68 65 20 64 6f 77 6e 6c 6f 61 64 |d...The download| 00000970 69 6e 67 20 69 73 20 64 6f 6e 65 20 62 79 20 61 |ing is done by a| 00000980 20 73 68 6f 72 74 20 4d 2f 63 6f 64 65 20 72 6f | short M/code ro| 00000990 75 74 69 6e 65 20 61 64 64 65 64 20 74 6f 20 74 |utine added to t| 000009a0 68 65 20 63 6f 6d 70 72 65 73 73 69 6f 6d 0d 72 |he compressiom.r| 000009b0 6f 75 74 69 6e 65 73 20 61 74 20 26 39 45 45 2e |outines at &9EE.| 000009c0 20 20 54 68 65 1a 20 61 64 64 72 65 73 73 65 73 | The. addresses| 000009d0 1a 20 66 6f 72 1a 20 74 68 69 73 1a 20 61 72 65 |. for. this. are| 000009e0 20 73 65 74 20 61 74 20 6c 69 6e 65 20 32 30 35 | set at line 205| 000009f0 30 20 61 6e 64 20 74 68 65 0d 72 6f 75 74 69 6e |0 and the.routin| 00000a00 65 20 43 41 4c 4c 65 64 20 61 74 20 6c 69 6e 65 |e CALLed at line| 00000a10 20 37 35 20 61 66 74 65 72 20 64 6f 77 6e 6c 6f | 75 after downlo| 00000a20 61 64 69 6e 67 2e 0d 0d 41 20 66 75 72 74 68 65 |ading...A furthe| 00000a30 72 20 70 6f 69 6e 74 20 69 73 20 74 68 61 74 20 |r point is that | 00000a40 74 68 65 20 6d 65 6d 6f 72 79 20 6d 75 73 74 20 |the memory must | 00000a50 62 65 20 63 6c 65 61 72 65 64 20 6f 6e 20 70 72 |be cleared on pr| 00000a60 65 73 73 69 6e 67 20 43 74 72 6c 2f 42 72 6b 20 |essing Ctrl/Brk | 00000a70 61 73 0d 49 20 66 6f 75 6e 64 20 74 68 61 74 2c |as.I found that,| 00000a80 20 6f 6e 20 73 65 6c 65 63 74 69 6e 67 20 61 6e | on selecting an| 00000a90 6f 74 68 65 72 1a 20 64 65 6d 6f 1a 20 61 66 74 |other. demo. aft| 00000aa0 65 72 1a 20 61 1a 20 43 74 72 6c 2f 42 72 6b 2c |er. a. Ctrl/Brk,| 00000ab0 20 74 68 65 20 64 65 6d 6f 20 77 61 73 0d 6d 69 | the demo was.mi| 00000ac0 73 70 6c 61 63 65 64 2e 20 20 49 20 68 61 76 65 |splaced. I have| 00000ad0 20 69 6e 63 6c 75 64 65 64 20 74 68 65 20 2a 46 | included the *F| 00000ae0 58 32 30 30 2c 33 20 63 61 6c 6c 20 61 74 20 6c |X200,3 call at l| 00000af0 69 6e 65 20 32 30 31 30 20 74 6f 20 63 6c 65 61 |ine 2010 to clea| 00000b00 72 20 6d 65 6d 6f 72 79 0d 73 6f 20 74 68 61 74 |r memory.so that| 00000b10 20 74 68 65 20 64 65 6d 6f 73 20 61 72 65 20 63 | the demos are c| 00000b20 6f 72 72 65 63 74 6c 79 20 73 68 6f 77 6e 2e 0d |orrectly shown..| 00000b30 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 00000b70 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 0d 0d |**********..| 00000b7c