Home » CEEFAX disks » telesoftware3.adl » 23_10_87/CESIL
23_10_87/CESIL
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 » telesoftware3.adl |
| Filename: | 23_10_87/CESIL |
| Read OK: | ✔ |
| File size: | 062B bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
�DH/CESIL review//R. McDermott/
�DF//Page |P//
BBC Telesoftware - Reviews For Education:
Software: CESIL
Supplier: Medusa Software
Price: `
Cesil is a simulation two pass assembler and a simple CPU (Central
Processing Unit) using its own mnemonics as its assembly language.
This simulation is aimed at those who would like to know a little
more about how computers work at the microprocessor level. Little
pre-knowledge is required, except a general awareness of how a computer
works. The programme demonstrates
a) the workings of a simple assembler
b) the nature of two pass assembly
c) the difference between direct and indirect jumps
d) the difference between assembly language and machine
code
e) the different methods of numnber representation, eg
two's complement and sign and magnitude
f) The fetch-execute cycle
The manual that comes with the programme takes the student through
the various facilities offered by Cesil but although fairly useful at the
beginning, distinctly fails to explain the more involved aspects of
assembly, ie the difference between direct and indirect jumps.
Cesil is quite easy to use at the simple level of constructing a
programme to store/fetch/add/subtract numbers, but is let down by the
manual which is far too brief in its explanation of anything but the
simplest concepts of assembly language.
R.McDermott
00000000 80 44 48 2f 43 45 53 49 4c 20 72 65 76 69 65 77 |.DH/CESIL review| 00000010 2f 2f 52 2e 20 4d 63 44 65 72 6d 6f 74 74 2f 0d |//R. McDermott/.| 00000020 80 44 46 2f 2f 50 61 67 65 20 7c 50 2f 2f 0d 42 |.DF//Page |P//.B| 00000030 42 43 20 54 65 6c 65 73 6f 66 74 77 61 72 65 20 |BC Telesoftware | 00000040 2d 20 52 65 76 69 65 77 73 20 46 6f 72 20 45 64 |- Reviews For Ed| 00000050 75 63 61 74 69 6f 6e 3a 0d 0d 53 6f 66 74 77 61 |ucation:..Softwa| 00000060 72 65 3a 20 43 45 53 49 4c 0d 0d 53 75 70 70 6c |re: CESIL..Suppl| 00000070 69 65 72 3a 20 4d 65 64 75 73 61 20 53 6f 66 74 |ier: Medusa Soft| 00000080 77 61 72 65 0d 0d 50 72 69 63 65 3a 20 20 20 20 |ware..Price: | 00000090 60 0d 0d 0d 0d 0d 20 20 20 20 20 43 65 73 69 6c |`..... Cesil| 000000a0 20 69 73 20 61 20 73 69 6d 75 6c 61 74 69 6f 6e | is a simulation| 000000b0 20 74 77 6f 20 70 61 73 73 20 61 73 73 65 6d 62 | two pass assemb| 000000c0 6c 65 72 20 61 6e 64 20 61 20 73 69 6d 70 6c 65 |ler and a simple| 000000d0 20 43 50 55 20 28 43 65 6e 74 72 61 6c 0d 50 72 | CPU (Central.Pr| 000000e0 6f 63 65 73 73 69 6e 67 20 55 6e 69 74 29 20 75 |ocessing Unit) u| 000000f0 73 69 6e 67 20 69 74 73 20 6f 77 6e 20 6d 6e 65 |sing its own mne| 00000100 6d 6f 6e 69 63 73 20 61 73 20 69 74 73 20 61 73 |monics as its as| 00000110 73 65 6d 62 6c 79 20 6c 61 6e 67 75 61 67 65 2e |sembly language.| 00000120 0d 0d 20 20 20 20 20 54 68 69 73 20 73 69 6d 75 |.. This simu| 00000130 6c 61 74 69 6f 6e 20 69 73 20 61 69 6d 65 64 20 |lation is aimed | 00000140 61 74 20 74 68 6f 73 65 20 77 68 6f 20 77 6f 75 |at those who wou| 00000150 6c 64 20 6c 69 6b 65 20 74 6f 20 6b 6e 6f 77 20 |ld like to know | 00000160 61 20 6c 69 74 74 6c 65 0d 6d 6f 72 65 20 61 62 |a little.more ab| 00000170 6f 75 74 20 68 6f 77 20 63 6f 6d 70 75 74 65 72 |out how computer| 00000180 73 20 77 6f 72 6b 20 61 74 20 74 68 65 20 6d 69 |s work at the mi| 00000190 63 72 6f 70 72 6f 63 65 73 73 6f 72 20 6c 65 76 |croprocessor lev| 000001a0 65 6c 2e 20 20 20 4c 69 74 74 6c 65 0d 70 72 65 |el. Little.pre| 000001b0 2d 6b 6e 6f 77 6c 65 64 67 65 20 69 73 20 72 65 |-knowledge is re| 000001c0 71 75 69 72 65 64 2c 20 65 78 63 65 70 74 20 61 |quired, except a| 000001d0 20 67 65 6e 65 72 61 6c 20 61 77 61 72 65 6e 65 | general awarene| 000001e0 73 73 20 6f 66 20 68 6f 77 20 61 20 63 6f 6d 70 |ss of how a comp| 000001f0 75 74 65 72 0d 77 6f 72 6b 73 2e 20 20 20 54 68 |uter.works. Th| 00000200 65 20 70 72 6f 67 72 61 6d 6d 65 20 64 65 6d 6f |e programme demo| 00000210 6e 73 74 72 61 74 65 73 0d 0d 20 20 20 20 20 20 |nstrates.. | 00000220 20 20 20 20 20 20 20 20 20 20 20 20 61 29 20 74 | a) t| 00000230 68 65 20 77 6f 72 6b 69 6e 67 73 20 6f 66 20 61 |he workings of a| 00000240 20 73 69 6d 70 6c 65 20 61 73 73 65 6d 62 6c 65 | simple assemble| 00000250 72 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |r. | 00000260 20 20 20 20 62 29 20 74 68 65 20 6e 61 74 75 72 | b) the natur| 00000270 65 20 6f 66 20 74 77 6f 20 70 61 73 73 20 61 73 |e of two pass as| 00000280 73 65 6d 62 6c 79 0d 20 20 20 20 20 20 20 20 20 |sembly. | 00000290 20 20 20 20 20 20 20 20 20 63 29 20 74 68 65 20 | c) the | 000002a0 64 69 66 66 65 72 65 6e 63 65 20 62 65 74 77 65 |difference betwe| 000002b0 65 6e 20 64 69 72 65 63 74 20 61 6e 64 20 69 6e |en direct and in| 000002c0 64 69 72 65 63 74 20 6a 75 6d 70 73 0d 20 20 20 |direct jumps. | 000002d0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 64 | d| 000002e0 29 20 74 68 65 20 64 69 66 66 65 72 65 6e 63 65 |) the difference| 000002f0 20 62 65 74 77 65 65 6e 20 61 73 73 65 6d 62 6c | between assembl| 00000300 79 20 6c 61 6e 67 75 61 67 65 20 61 6e 64 20 6d |y language and m| 00000310 61 63 68 69 6e 65 0d 20 20 20 20 20 20 20 20 20 |achine. | 00000320 20 20 20 20 20 20 20 20 20 20 20 20 63 6f 64 65 | code| 00000330 20 20 20 20 20 20 20 20 20 20 20 20 20 20 0d 20 | . | 00000340 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000350 20 65 29 20 74 68 65 20 64 69 66 66 65 72 65 6e | e) the differen| 00000360 74 20 6d 65 74 68 6f 64 73 20 6f 66 20 6e 75 6d |t methods of num| 00000370 6e 62 65 72 20 72 65 70 72 65 73 65 6e 74 61 74 |nber representat| 00000380 69 6f 6e 2c 20 65 67 0d 20 20 20 20 20 20 20 20 |ion, eg. | 00000390 20 20 20 20 20 20 20 20 20 20 20 20 20 74 77 6f | two| 000003a0 27 73 20 63 6f 6d 70 6c 65 6d 65 6e 74 20 61 6e |'s complement an| 000003b0 64 20 73 69 67 6e 20 61 6e 64 20 6d 61 67 6e 69 |d sign and magni| 000003c0 74 75 64 65 0d 20 20 20 20 20 20 20 20 20 20 20 |tude. | 000003d0 20 20 20 20 20 20 20 66 29 20 54 68 65 20 66 65 | f) The fe| 000003e0 74 63 68 2d 65 78 65 63 75 74 65 20 63 79 63 6c |tch-execute cycl| 000003f0 65 0d 0d 20 20 20 20 20 54 68 65 20 6d 61 6e 75 |e.. The manu| 00000400 61 6c 20 74 68 61 74 20 63 6f 6d 65 73 20 77 69 |al that comes wi| 00000410 74 68 20 74 68 65 20 70 72 6f 67 72 61 6d 6d 65 |th the programme| 00000420 20 74 61 6b 65 73 20 74 68 65 20 73 74 75 64 65 | takes the stude| 00000430 6e 74 20 74 68 72 6f 75 67 68 0d 74 68 65 20 76 |nt through.the v| 00000440 61 72 69 6f 75 73 20 66 61 63 69 6c 69 74 69 65 |arious facilitie| 00000450 73 20 6f 66 66 65 72 65 64 20 62 79 20 43 65 73 |s offered by Ces| 00000460 69 6c 20 62 75 74 20 61 6c 74 68 6f 75 67 68 20 |il but although | 00000470 66 61 69 72 6c 79 20 75 73 65 66 75 6c 20 61 74 |fairly useful at| 00000480 20 74 68 65 0d 62 65 67 69 6e 6e 69 6e 67 2c 20 | the.beginning, | 00000490 64 69 73 74 69 6e 63 74 6c 79 20 66 61 69 6c 73 |distinctly fails| 000004a0 20 74 6f 20 65 78 70 6c 61 69 6e 20 74 68 65 20 | to explain the | 000004b0 6d 6f 72 65 20 69 6e 76 6f 6c 76 65 64 20 61 73 |more involved as| 000004c0 70 65 63 74 73 20 6f 66 0d 61 73 73 65 6d 62 6c |pects of.assembl| 000004d0 79 2c 20 69 65 20 74 68 65 20 64 69 66 66 65 72 |y, ie the differ| 000004e0 65 6e 63 65 20 62 65 74 77 65 65 6e 20 64 69 72 |ence between dir| 000004f0 65 63 74 20 61 6e 64 20 69 6e 64 69 72 65 63 74 |ect and indirect| 00000500 20 6a 75 6d 70 73 2e 0d 0d 20 20 20 20 20 43 65 | jumps... Ce| 00000510 73 69 6c 20 69 73 20 71 75 69 74 65 20 65 61 73 |sil is quite eas| 00000520 79 20 74 6f 20 75 73 65 20 61 74 20 74 68 65 20 |y to use at the | 00000530 73 69 6d 70 6c 65 20 6c 65 76 65 6c 20 6f 66 20 |simple level of | 00000540 63 6f 6e 73 74 72 75 63 74 69 6e 67 20 61 0d 70 |constructing a.p| 00000550 72 6f 67 72 61 6d 6d 65 20 74 6f 20 73 74 6f 72 |rogramme to stor| 00000560 65 2f 66 65 74 63 68 2f 61 64 64 2f 73 75 62 74 |e/fetch/add/subt| 00000570 72 61 63 74 20 6e 75 6d 62 65 72 73 2c 20 62 75 |ract numbers, bu| 00000580 74 20 69 73 20 6c 65 74 20 64 6f 77 6e 20 62 79 |t is let down by| 00000590 20 74 68 65 0d 6d 61 6e 75 61 6c 20 77 68 69 63 | the.manual whic| 000005a0 68 20 69 73 20 66 61 72 20 74 6f 6f 20 62 72 69 |h is far too bri| 000005b0 65 66 20 69 6e 20 69 74 73 20 65 78 70 6c 61 6e |ef in its explan| 000005c0 61 74 69 6f 6e 20 6f 66 20 61 6e 79 74 68 69 6e |ation of anythin| 000005d0 67 20 62 75 74 20 74 68 65 0d 73 69 6d 70 6c 65 |g but the.simple| 000005e0 73 74 20 63 6f 6e 63 65 70 74 73 20 6f 66 20 61 |st concepts of a| 000005f0 73 73 65 6d 62 6c 79 20 6c 61 6e 67 75 61 67 65 |ssembly language| 00000600 2e 0d 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 |... | 00000610 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 52 | R| 00000620 2e 4d 63 44 65 72 6d 6f 74 74 0d |.McDermott.| 0000062b
23_10_87/CESIL.m0
23_10_87/CESIL.m1
23_10_87/CESIL.m2
23_10_87/CESIL.m4
23_10_87/CESIL.m5
.