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ATS/T\ATS10
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 » CEEFAX disks » telesoftware2.adl |
| Filename: | ATS/T\ATS10 |
| Read OK: | ✔ |
| File size: | 0E56 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Interactive programming J.J.Brayshaw 1987
One of the most fundamental aspects of writing CEEFAX-interactive software
is to ensure that a teletext adapter is not only available, but connected,
switched on and receiving teletext. How can a computer program check this
situation? Read on, and all will be revealed ...
__________________________________________________________________________
Any computer program that depends for its operation on specific hardware
or software configurations should be able to identify the presence of such
equipment, and exit gracefully if it is not present.
This also applies, of course, to CEEFAX interactive software. Fortunately,
the ATS ROM provides routines to test for the presence of the adapter.
This OSWORD call will not only detect whether the adapter is connected,
but will also report whether the power to the adapter is on and whether it
is receiving a teletext signal.
For most purposes, all three conditions must be met in order for the
software to continue. However, as the adapter status is reported in such
detail, we can, for example, produce an on-screen message if the adapter
is discovered to be connected but not powered up, to inform the user he
must switch on the adapter, press <BREAK> (to re-set PAGE and allow the
system to re-evaluate the adapter status) then re-load the program.
If the ATS ROM itself is not present, or it has been disabled with *NOTTX,
then the results of this OSWORD call are unpredictable. For this reason,
we need to set up a "default" situation in case the call does not return a
"status" byte, hence the need to insert &FE into the second byte of the
parameter block in the accompanying program. If the routine returns the
status, the byte &FE will be overwritten with the correct status byte. If
it does not return a value, the byte will remain as &FE and we can safely
assume the ATS is not present or not answering the OSWORD call.
This routine does not require teletext reception to be enabled (as with
the *TTXON or *CH<x> commands). It returns the status instantly, and does
not need a time delay. More importantly, the OSWORD call does not generate
an error if the ATS is not present. This allows a far more flexible
routine to be engaged if the adapter status is not as expected.
When the ATS is implemented on other makes of adapter, there are some
routines that cannot be carried out fully. This is due to hardware
limitations inherent in the design of these units, caused by the type of
teletext reception chips used. These do not allow the same flexibility of
control as those used in the Acorn adapter. This call, therefore, does not
work fully with other makes of adapter.
__________________________________________________________________________
Page 1
Interactive programming J.J.Brayshaw 1987
Determining the adapter status allows us to take appropriate action
depending upon the individual hardware configuration. For example, if an
interactive program discovers there is no adapter present, it can be told
to load the CEEFAX pages from disc instead, allowing (with a certain
amount of preparation) a program to take live data if possible, otherwise
default to pre-recorded information.
Replacing the status messages given in the routine by numbers will make it
a simple matter to engage appropriate routines from the result. Any
CEEFAX-interactive program can be enhanced and made more versatile by
knowing the status of the teletext adapter.
Page 2
00000000 0d 0d 0d 0d 49 6e 74 65 72 61 63 74 69 76 65 20 |....Interactive | 00000010 70 72 6f 67 72 61 6d 6d 69 6e 67 20 20 20 20 20 |programming | 00000020 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000030 20 20 20 20 20 20 20 20 20 20 20 20 20 4a 2e 4a | J.J| 00000040 2e 42 72 61 79 73 68 61 77 20 31 39 38 37 0d 0d |.Brayshaw 1987..| 00000050 0d 0d 0d 4f 6e 65 20 6f 66 20 74 68 65 20 6d 6f |...One of the mo| 00000060 73 74 20 66 75 6e 64 61 6d 65 6e 74 61 6c 20 61 |st fundamental a| 00000070 73 70 65 63 74 73 20 6f 66 20 77 72 69 74 69 6e |spects of writin| 00000080 67 20 43 45 45 46 41 58 2d 69 6e 74 65 72 61 63 |g CEEFAX-interac| 00000090 74 69 76 65 20 73 6f 66 74 77 61 72 65 0d 69 73 |tive software.is| 000000a0 20 74 6f 20 65 6e 73 75 72 65 20 74 68 61 74 20 | to ensure that | 000000b0 61 20 74 65 6c 65 74 65 78 74 20 61 64 61 70 74 |a teletext adapt| 000000c0 65 72 20 69 73 20 6e 6f 74 20 6f 6e 6c 79 20 61 |er is not only a| 000000d0 76 61 69 6c 61 62 6c 65 2c 20 62 75 74 20 63 6f |vailable, but co| 000000e0 6e 6e 65 63 74 65 64 2c 0d 73 77 69 74 63 68 65 |nnected,.switche| 000000f0 64 20 6f 6e 20 61 6e 64 20 72 65 63 65 69 76 69 |d on and receivi| 00000100 6e 67 20 74 65 6c 65 74 65 78 74 2e 20 48 6f 77 |ng teletext. How| 00000110 20 63 61 6e 20 61 20 63 6f 6d 70 75 74 65 72 20 | can a computer | 00000120 70 72 6f 67 72 61 6d 20 63 68 65 63 6b 20 74 68 |program check th| 00000130 69 73 0d 73 69 74 75 61 74 69 6f 6e 3f 20 52 65 |is.situation? Re| 00000140 61 64 20 6f 6e 2c 20 61 6e 64 20 61 6c 6c 20 77 |ad on, and all w| 00000150 69 6c 6c 20 62 65 20 72 65 76 65 61 6c 65 64 20 |ill be revealed | 00000160 2e 2e 2e 0d 0d 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |.....___________| 00000170 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |________________| * 000001a0 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 0d |_______________.| 000001b0 0d 0d 41 6e 79 20 63 6f 6d 70 75 74 65 72 20 70 |..Any computer p| 000001c0 72 6f 67 72 61 6d 20 74 68 61 74 20 64 65 70 65 |rogram that depe| 000001d0 6e 64 73 20 66 6f 72 20 69 74 73 20 6f 70 65 72 |nds for its oper| 000001e0 61 74 69 6f 6e 20 6f 6e 20 73 70 65 63 69 66 69 |ation on specifi| 000001f0 63 20 68 61 72 64 77 61 72 65 0d 6f 72 20 73 6f |c hardware.or so| 00000200 66 74 77 61 72 65 20 63 6f 6e 66 69 67 75 72 61 |ftware configura| 00000210 74 69 6f 6e 73 20 73 68 6f 75 6c 64 20 62 65 20 |tions should be | 00000220 61 62 6c 65 20 74 6f 20 69 64 65 6e 74 69 66 79 |able to identify| 00000230 20 74 68 65 20 70 72 65 73 65 6e 63 65 20 6f 66 | the presence of| 00000240 20 73 75 63 68 0d 65 71 75 69 70 6d 65 6e 74 2c | such.equipment,| 00000250 20 61 6e 64 20 65 78 69 74 20 67 72 61 63 65 66 | and exit gracef| 00000260 75 6c 6c 79 20 69 66 20 69 74 20 69 73 20 6e 6f |ully if it is no| 00000270 74 20 70 72 65 73 65 6e 74 2e 0d 0d 54 68 69 73 |t present...This| 00000280 20 61 6c 73 6f 20 61 70 70 6c 69 65 73 2c 20 6f | also applies, o| 00000290 66 20 63 6f 75 72 73 65 2c 20 74 6f 20 43 45 45 |f course, to CEE| 000002a0 46 41 58 20 69 6e 74 65 72 61 63 74 69 76 65 20 |FAX interactive | 000002b0 73 6f 66 74 77 61 72 65 2e 20 46 6f 72 74 75 6e |software. Fortun| 000002c0 61 74 65 6c 79 2c 0d 74 68 65 20 41 54 53 20 52 |ately,.the ATS R| 000002d0 4f 4d 20 70 72 6f 76 69 64 65 73 20 72 6f 75 74 |OM provides rout| 000002e0 69 6e 65 73 20 74 6f 20 74 65 73 74 20 66 6f 72 |ines to test for| 000002f0 20 74 68 65 20 70 72 65 73 65 6e 63 65 20 6f 66 | the presence of| 00000300 20 74 68 65 20 61 64 61 70 74 65 72 2e 0d 54 68 | the adapter..Th| 00000310 69 73 20 4f 53 57 4f 52 44 20 63 61 6c 6c 20 77 |is OSWORD call w| 00000320 69 6c 6c 20 6e 6f 74 20 6f 6e 6c 79 20 64 65 74 |ill not only det| 00000330 65 63 74 20 77 68 65 74 68 65 72 20 74 68 65 20 |ect whether the | 00000340 61 64 61 70 74 65 72 20 69 73 20 63 6f 6e 6e 65 |adapter is conne| 00000350 63 74 65 64 2c 0d 62 75 74 20 77 69 6c 6c 20 61 |cted,.but will a| 00000360 6c 73 6f 20 72 65 70 6f 72 74 20 77 68 65 74 68 |lso report wheth| 00000370 65 72 20 74 68 65 20 70 6f 77 65 72 20 74 6f 20 |er the power to | 00000380 74 68 65 20 61 64 61 70 74 65 72 20 69 73 20 6f |the adapter is o| 00000390 6e 20 61 6e 64 20 77 68 65 74 68 65 72 20 69 74 |n and whether it| 000003a0 0d 69 73 20 72 65 63 65 69 76 69 6e 67 20 61 20 |.is receiving a | 000003b0 74 65 6c 65 74 65 78 74 20 73 69 67 6e 61 6c 2e |teletext signal.| 000003c0 0d 0d 46 6f 72 20 6d 6f 73 74 20 70 75 72 70 6f |..For most purpo| 000003d0 73 65 73 2c 20 61 6c 6c 20 74 68 72 65 65 20 63 |ses, all three c| 000003e0 6f 6e 64 69 74 69 6f 6e 73 20 6d 75 73 74 20 62 |onditions must b| 000003f0 65 20 6d 65 74 20 69 6e 20 6f 72 64 65 72 20 66 |e met in order f| 00000400 6f 72 20 74 68 65 0d 73 6f 66 74 77 61 72 65 20 |or the.software | 00000410 74 6f 20 63 6f 6e 74 69 6e 75 65 2e 20 48 6f 77 |to continue. How| 00000420 65 76 65 72 2c 20 61 73 20 74 68 65 20 61 64 61 |ever, as the ada| 00000430 70 74 65 72 20 73 74 61 74 75 73 20 69 73 20 72 |pter status is r| 00000440 65 70 6f 72 74 65 64 20 69 6e 20 73 75 63 68 0d |eported in such.| 00000450 64 65 74 61 69 6c 2c 20 77 65 20 63 61 6e 2c 20 |detail, we can, | 00000460 66 6f 72 20 65 78 61 6d 70 6c 65 2c 20 70 72 6f |for example, pro| 00000470 64 75 63 65 20 61 6e 20 6f 6e 2d 73 63 72 65 65 |duce an on-scree| 00000480 6e 20 6d 65 73 73 61 67 65 20 69 66 20 74 68 65 |n message if the| 00000490 20 61 64 61 70 74 65 72 0d 69 73 20 64 69 73 63 | adapter.is disc| 000004a0 6f 76 65 72 65 64 20 74 6f 20 62 65 20 63 6f 6e |overed to be con| 000004b0 6e 65 63 74 65 64 20 62 75 74 20 6e 6f 74 20 70 |nected but not p| 000004c0 6f 77 65 72 65 64 20 75 70 2c 20 74 6f 20 69 6e |owered up, to in| 000004d0 66 6f 72 6d 20 74 68 65 20 75 73 65 72 20 68 65 |form the user he| 000004e0 0d 6d 75 73 74 20 73 77 69 74 63 68 20 6f 6e 20 |.must switch on | 000004f0 74 68 65 20 61 64 61 70 74 65 72 2c 20 70 72 65 |the adapter, pre| 00000500 73 73 20 3c 42 52 45 41 4b 3e 20 28 74 6f 20 72 |ss <BREAK> (to r| 00000510 65 2d 73 65 74 20 50 41 47 45 20 61 6e 64 20 61 |e-set PAGE and a| 00000520 6c 6c 6f 77 20 74 68 65 0d 73 79 73 74 65 6d 20 |llow the.system | 00000530 74 6f 20 72 65 2d 65 76 61 6c 75 61 74 65 20 74 |to re-evaluate t| 00000540 68 65 20 61 64 61 70 74 65 72 20 73 74 61 74 75 |he adapter statu| 00000550 73 29 20 74 68 65 6e 20 72 65 2d 6c 6f 61 64 20 |s) then re-load | 00000560 74 68 65 20 70 72 6f 67 72 61 6d 2e 0d 0d 49 66 |the program...If| 00000570 20 74 68 65 20 41 54 53 20 52 4f 4d 20 69 74 73 | the ATS ROM its| 00000580 65 6c 66 20 69 73 20 6e 6f 74 20 70 72 65 73 65 |elf is not prese| 00000590 6e 74 2c 20 6f 72 20 69 74 20 68 61 73 20 62 65 |nt, or it has be| 000005a0 65 6e 20 64 69 73 61 62 6c 65 64 20 77 69 74 68 |en disabled with| 000005b0 20 2a 4e 4f 54 54 58 2c 0d 74 68 65 6e 20 74 68 | *NOTTX,.then th| 000005c0 65 20 72 65 73 75 6c 74 73 20 6f 66 20 74 68 69 |e results of thi| 000005d0 73 20 4f 53 57 4f 52 44 20 63 61 6c 6c 20 61 72 |s OSWORD call ar| 000005e0 65 20 75 6e 70 72 65 64 69 63 74 61 62 6c 65 2e |e unpredictable.| 000005f0 20 46 6f 72 20 74 68 69 73 20 72 65 61 73 6f 6e | For this reason| 00000600 2c 0d 77 65 20 6e 65 65 64 20 74 6f 20 73 65 74 |,.we need to set| 00000610 20 75 70 20 61 20 22 64 65 66 61 75 6c 74 22 20 | up a "default" | 00000620 73 69 74 75 61 74 69 6f 6e 20 69 6e 20 63 61 73 |situation in cas| 00000630 65 20 74 68 65 20 63 61 6c 6c 20 64 6f 65 73 20 |e the call does | 00000640 6e 6f 74 20 72 65 74 75 72 6e 20 61 0d 22 73 74 |not return a."st| 00000650 61 74 75 73 22 20 62 79 74 65 2c 20 68 65 6e 63 |atus" byte, henc| 00000660 65 20 74 68 65 20 6e 65 65 64 20 74 6f 20 69 6e |e the need to in| 00000670 73 65 72 74 20 26 46 45 20 69 6e 74 6f 20 74 68 |sert &FE into th| 00000680 65 20 73 65 63 6f 6e 64 20 62 79 74 65 20 6f 66 |e second byte of| 00000690 20 74 68 65 0d 70 61 72 61 6d 65 74 65 72 20 62 | the.parameter b| 000006a0 6c 6f 63 6b 20 69 6e 20 74 68 65 20 61 63 63 6f |lock in the acco| 000006b0 6d 70 61 6e 79 69 6e 67 20 70 72 6f 67 72 61 6d |mpanying program| 000006c0 2e 20 49 66 20 74 68 65 20 72 6f 75 74 69 6e 65 |. If the routine| 000006d0 20 72 65 74 75 72 6e 73 20 74 68 65 0d 73 74 61 | returns the.sta| 000006e0 74 75 73 2c 20 74 68 65 20 62 79 74 65 20 26 46 |tus, the byte &F| 000006f0 45 20 77 69 6c 6c 20 62 65 20 6f 76 65 72 77 72 |E will be overwr| 00000700 69 74 74 65 6e 20 77 69 74 68 20 74 68 65 20 63 |itten with the c| 00000710 6f 72 72 65 63 74 20 73 74 61 74 75 73 20 62 79 |orrect status by| 00000720 74 65 2e 20 49 66 0d 69 74 20 64 6f 65 73 20 6e |te. If.it does n| 00000730 6f 74 20 72 65 74 75 72 6e 20 61 20 76 61 6c 75 |ot return a valu| 00000740 65 2c 20 74 68 65 20 62 79 74 65 20 77 69 6c 6c |e, the byte will| 00000750 20 72 65 6d 61 69 6e 20 61 73 20 26 46 45 20 61 | remain as &FE a| 00000760 6e 64 20 77 65 20 63 61 6e 20 73 61 66 65 6c 79 |nd we can safely| 00000770 0d 61 73 73 75 6d 65 20 74 68 65 20 41 54 53 20 |.assume the ATS | 00000780 69 73 20 6e 6f 74 20 70 72 65 73 65 6e 74 20 6f |is not present o| 00000790 72 20 6e 6f 74 20 61 6e 73 77 65 72 69 6e 67 20 |r not answering | 000007a0 74 68 65 20 4f 53 57 4f 52 44 20 63 61 6c 6c 2e |the OSWORD call.| 000007b0 0d 0d 54 68 69 73 20 72 6f 75 74 69 6e 65 20 64 |..This routine d| 000007c0 6f 65 73 20 6e 6f 74 20 72 65 71 75 69 72 65 20 |oes not require | 000007d0 74 65 6c 65 74 65 78 74 20 72 65 63 65 70 74 69 |teletext recepti| 000007e0 6f 6e 20 74 6f 20 62 65 20 65 6e 61 62 6c 65 64 |on to be enabled| 000007f0 20 28 61 73 20 77 69 74 68 0d 74 68 65 20 2a 54 | (as with.the *T| 00000800 54 58 4f 4e 20 6f 72 20 2a 43 48 3c 78 3e 20 63 |TXON or *CH<x> c| 00000810 6f 6d 6d 61 6e 64 73 29 2e 20 49 74 20 72 65 74 |ommands). It ret| 00000820 75 72 6e 73 20 74 68 65 20 73 74 61 74 75 73 20 |urns the status | 00000830 69 6e 73 74 61 6e 74 6c 79 2c 20 61 6e 64 20 64 |instantly, and d| 00000840 6f 65 73 0d 6e 6f 74 20 6e 65 65 64 20 61 20 74 |oes.not need a t| 00000850 69 6d 65 20 64 65 6c 61 79 2e 20 4d 6f 72 65 20 |ime delay. More | 00000860 69 6d 70 6f 72 74 61 6e 74 6c 79 2c 20 74 68 65 |importantly, the| 00000870 20 4f 53 57 4f 52 44 20 63 61 6c 6c 20 64 6f 65 | OSWORD call doe| 00000880 73 20 6e 6f 74 20 67 65 6e 65 72 61 74 65 0d 61 |s not generate.a| 00000890 6e 20 65 72 72 6f 72 20 69 66 20 74 68 65 20 41 |n error if the A| 000008a0 54 53 20 69 73 20 6e 6f 74 20 70 72 65 73 65 6e |TS is not presen| 000008b0 74 2e 20 54 68 69 73 20 61 6c 6c 6f 77 73 20 61 |t. This allows a| 000008c0 20 66 61 72 20 6d 6f 72 65 20 66 6c 65 78 69 62 | far more flexib| 000008d0 6c 65 0d 72 6f 75 74 69 6e 65 20 74 6f 20 62 65 |le.routine to be| 000008e0 20 65 6e 67 61 67 65 64 20 69 66 20 74 68 65 20 | engaged if the | 000008f0 61 64 61 70 74 65 72 20 73 74 61 74 75 73 20 69 |adapter status i| 00000900 73 20 6e 6f 74 20 61 73 20 65 78 70 65 63 74 65 |s not as expecte| 00000910 64 2e 0d 0d 57 68 65 6e 20 74 68 65 20 41 54 53 |d...When the ATS| 00000920 20 69 73 20 69 6d 70 6c 65 6d 65 6e 74 65 64 20 | is implemented | 00000930 6f 6e 20 6f 74 68 65 72 20 6d 61 6b 65 73 20 6f |on other makes o| 00000940 66 20 61 64 61 70 74 65 72 2c 20 74 68 65 72 65 |f adapter, there| 00000950 20 61 72 65 20 73 6f 6d 65 0d 72 6f 75 74 69 6e | are some.routin| 00000960 65 73 20 74 68 61 74 20 63 61 6e 6e 6f 74 20 62 |es that cannot b| 00000970 65 20 63 61 72 72 69 65 64 20 6f 75 74 20 66 75 |e carried out fu| 00000980 6c 6c 79 2e 20 54 68 69 73 20 69 73 20 64 75 65 |lly. This is due| 00000990 20 74 6f 20 68 61 72 64 77 61 72 65 0d 6c 69 6d | to hardware.lim| 000009a0 69 74 61 74 69 6f 6e 73 20 69 6e 68 65 72 65 6e |itations inheren| 000009b0 74 20 69 6e 20 74 68 65 20 64 65 73 69 67 6e 20 |t in the design | 000009c0 6f 66 20 74 68 65 73 65 20 75 6e 69 74 73 2c 20 |of these units, | 000009d0 63 61 75 73 65 64 20 62 79 20 74 68 65 20 74 79 |caused by the ty| 000009e0 70 65 20 6f 66 0d 74 65 6c 65 74 65 78 74 20 72 |pe of.teletext r| 000009f0 65 63 65 70 74 69 6f 6e 20 63 68 69 70 73 20 75 |eception chips u| 00000a00 73 65 64 2e 20 54 68 65 73 65 20 64 6f 20 6e 6f |sed. These do no| 00000a10 74 20 61 6c 6c 6f 77 20 74 68 65 20 73 61 6d 65 |t allow the same| 00000a20 20 66 6c 65 78 69 62 69 6c 69 74 79 20 6f 66 0d | flexibility of.| 00000a30 63 6f 6e 74 72 6f 6c 20 61 73 20 74 68 6f 73 65 |control as those| 00000a40 20 75 73 65 64 20 69 6e 20 74 68 65 20 41 63 6f | used in the Aco| 00000a50 72 6e 20 61 64 61 70 74 65 72 2e 20 54 68 69 73 |rn adapter. This| 00000a60 20 63 61 6c 6c 2c 20 74 68 65 72 65 66 6f 72 65 | call, therefore| 00000a70 2c 20 64 6f 65 73 20 6e 6f 74 0d 77 6f 72 6b 20 |, does not.work | 00000a80 66 75 6c 6c 79 20 77 69 74 68 20 6f 74 68 65 72 |fully with other| 00000a90 20 6d 61 6b 65 73 20 6f 66 20 61 64 61 70 74 65 | makes of adapte| 00000aa0 72 2e 0d 0d 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |r...____________| 00000ab0 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f |________________| * 00000ae0 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 5f 0d 0d |______________..| 00000af0 0d 0d 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 |... | 00000b00 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000b10 20 20 20 20 20 50 61 67 65 20 31 0d 0d 0d 0d 0d | Page 1.....| 00000b20 0d 0d 0d 0d 49 6e 74 65 72 61 63 74 69 76 65 20 |....Interactive | 00000b30 70 72 6f 67 72 61 6d 6d 69 6e 67 20 20 20 20 20 |programming | 00000b40 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000b50 20 20 20 20 20 20 20 20 20 20 20 20 20 4a 2e 4a | J.J| 00000b60 2e 42 72 61 79 73 68 61 77 20 31 39 38 37 0d 0d |.Brayshaw 1987..| 00000b70 0d 0d 0d 0d 44 65 74 65 72 6d 69 6e 69 6e 67 20 |....Determining | 00000b80 74 68 65 20 61 64 61 70 74 65 72 20 73 74 61 74 |the adapter stat| 00000b90 75 73 20 61 6c 6c 6f 77 73 20 75 73 20 74 6f 20 |us allows us to | 00000ba0 74 61 6b 65 20 61 70 70 72 6f 70 72 69 61 74 65 |take appropriate| 00000bb0 20 61 63 74 69 6f 6e 0d 64 65 70 65 6e 64 69 6e | action.dependin| 00000bc0 67 20 75 70 6f 6e 20 74 68 65 20 69 6e 64 69 76 |g upon the indiv| 00000bd0 69 64 75 61 6c 20 68 61 72 64 77 61 72 65 20 63 |idual hardware c| 00000be0 6f 6e 66 69 67 75 72 61 74 69 6f 6e 2e 20 46 6f |onfiguration. Fo| 00000bf0 72 20 65 78 61 6d 70 6c 65 2c 20 69 66 20 61 6e |r example, if an| 00000c00 0d 69 6e 74 65 72 61 63 74 69 76 65 20 70 72 6f |.interactive pro| 00000c10 67 72 61 6d 20 64 69 73 63 6f 76 65 72 73 20 74 |gram discovers t| 00000c20 68 65 72 65 20 69 73 20 6e 6f 20 61 64 61 70 74 |here is no adapt| 00000c30 65 72 20 70 72 65 73 65 6e 74 2c 20 69 74 20 63 |er present, it c| 00000c40 61 6e 20 62 65 20 74 6f 6c 64 0d 74 6f 20 6c 6f |an be told.to lo| 00000c50 61 64 20 74 68 65 20 43 45 45 46 41 58 20 70 61 |ad the CEEFAX pa| 00000c60 67 65 73 20 66 72 6f 6d 20 64 69 73 63 20 69 6e |ges from disc in| 00000c70 73 74 65 61 64 2c 20 61 6c 6c 6f 77 69 6e 67 20 |stead, allowing | 00000c80 28 77 69 74 68 20 61 20 63 65 72 74 61 69 6e 0d |(with a certain.| 00000c90 61 6d 6f 75 6e 74 20 6f 66 20 70 72 65 70 61 72 |amount of prepar| 00000ca0 61 74 69 6f 6e 29 20 61 20 70 72 6f 67 72 61 6d |ation) a program| 00000cb0 20 74 6f 20 74 61 6b 65 20 6c 69 76 65 20 64 61 | to take live da| 00000cc0 74 61 20 69 66 20 70 6f 73 73 69 62 6c 65 2c 20 |ta if possible, | 00000cd0 6f 74 68 65 72 77 69 73 65 0d 64 65 66 61 75 6c |otherwise.defaul| 00000ce0 74 20 74 6f 20 70 72 65 2d 72 65 63 6f 72 64 65 |t to pre-recorde| 00000cf0 64 20 69 6e 66 6f 72 6d 61 74 69 6f 6e 2e 0d 0d |d information...| 00000d00 52 65 70 6c 61 63 69 6e 67 20 74 68 65 20 73 74 |Replacing the st| 00000d10 61 74 75 73 20 6d 65 73 73 61 67 65 73 20 67 69 |atus messages gi| 00000d20 76 65 6e 20 69 6e 20 74 68 65 20 72 6f 75 74 69 |ven in the routi| 00000d30 6e 65 20 62 79 20 6e 75 6d 62 65 72 73 20 77 69 |ne by numbers wi| 00000d40 6c 6c 20 6d 61 6b 65 20 69 74 0d 61 20 73 69 6d |ll make it.a sim| 00000d50 70 6c 65 20 6d 61 74 74 65 72 20 74 6f 20 65 6e |ple matter to en| 00000d60 67 61 67 65 20 61 70 70 72 6f 70 72 69 61 74 65 |gage appropriate| 00000d70 20 72 6f 75 74 69 6e 65 73 20 66 72 6f 6d 20 74 | routines from t| 00000d80 68 65 20 72 65 73 75 6c 74 2e 20 41 6e 79 0d 43 |he result. Any.C| 00000d90 45 45 46 41 58 2d 69 6e 74 65 72 61 63 74 69 76 |EEFAX-interactiv| 00000da0 65 20 70 72 6f 67 72 61 6d 20 63 61 6e 20 62 65 |e program can be| 00000db0 20 65 6e 68 61 6e 63 65 64 20 61 6e 64 20 6d 61 | enhanced and ma| 00000dc0 64 65 20 6d 6f 72 65 20 76 65 72 73 61 74 69 6c |de more versatil| 00000dd0 65 20 62 79 0d 6b 6e 6f 77 69 6e 67 20 74 68 65 |e by.knowing the| 00000de0 20 73 74 61 74 75 73 20 6f 66 20 74 68 65 20 74 | status of the t| 00000df0 65 6c 65 74 65 78 74 20 61 64 61 70 74 65 72 2e |eletext adapter.| 00000e00 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d 0d |................| * 00000e20 0d 0d 0d 0d 0d 0d 0d 0d 0d 20 20 20 20 20 20 20 |......... | 00000e30 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000e40 20 20 20 20 20 20 20 20 20 20 20 50 61 67 65 20 | Page | 00000e50 32 0d 0d 0d 0d 0d |2.....| 00000e56
ATS/T\ATS10.m0
ATS/T\ATS10.m1
ATS/T\ATS10.m2
ATS/T\ATS10.m4
ATS/T\ATS10.m5
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