1194:
recorder, all housed in a "robust metal case". Powered by a single mains plug, the system was effectively a "turnkey" solution, emphasising the built-in spreadsheet as its primary function. Although regarded as worth considering as an "inexpensive way of obtaining a sound and reasonably well-presented spreadsheet system", being priced at £795 plus VAT, the use of cassette storage to reduce the system's cost was regarded as impacting its usability, with the slow data transfer rate causing waits of 30 minutes or more to save spreadsheet data and limiting the effective storage capacity of the microcassettes, whereas more expensive disk-based systems would be able to transfer similar volumes of data in a matter of seconds and store tens of spreadsheets on each disk. Regarded as "low-tech" later in 1983, the
Prophet II was apparently being given away to participants of one- or two-day business-related training courses, these costing £600 and £700 respectively, with this initiative considered "a nice way of moving old stock". A subsequent model, the Prophet 3, featured a built-in floppy disk drive.
842:. The upgrade was purely to the programming language; the Atom's hardware capabilities remained unchanged, and hence, contrary to some pre-release beliefs, the BBC BASIC ROM did not allow Atom users to run commercial BBC Micro software, since nearly all of it took advantage of the BBC machine's much more advanced graphics and sound hardware and greater RAM capacity. Commercial BBC Micro cassettes could not have been loaded anyway, as they ran at a transfer rate of 1200 baud and the Atom's cassette interface only supported 300 baud.
25:
129:
403:, allowing for both text and graphics modes. It could be connected to a TV or modified to output to a video monitor. Basic video memory was 1 KB but could be expanded to 6 KB. Since the MC6847 could only output at 60 Hz, meaning that the video could not be resolved on a large proportion of European TV sets, a 50 Hz
1168:
The Acorn 8V power supply was only rated to 1.5 amps, which was not enough for an Atom with fully populated RAM sockets. The Atom's two internal LM7805 regulators (each regulating the +5V for a section of the digital logic independently) also got uncomfortably hot. Therefore, some Atom enthusiasts
391:
language. When expanded up to a total of 12 KB RAM, the split is 1 KB, 5 KB for programs, and up to 6 KB for the high-resolution graphics (the screen memory could be expanded independently from the lower part of the address space). If the high-resolution graphics were not
1193:
The Atom was incorporated into a "complete dedicated spreadsheet system" known as the
Prophet by a company called Busicomputers, with the second edition of this product, the Prophet 2, consisting of a modified Atom, Ferguson 12-inch black-and-white television, and a Pearlcorder microcassette
438:) for bytes and words (of 4 bytes each); the use of a semi-colon to separate statements on the same line of code (instead of the colon used by most if not all other versions of BASIC); and the option of labels rather than line numbers for GOTO and GOSUB commands.
392:
required then up to 5½ KB of the upper memory could additionally be used for program storage. The first 1 KB, i.e. Block Zero, was used by the CPU for stack storage, by the OS, and by the Atom BASIC for storage of the 27 variables.
1180:
as the Atari 800XL allowed an Atari 5V linear power supply to drive an Atom, so long as the current was less than the Atari PSU rating (1 or 1.5 amps, depending on the model). These are now uncommon, but 5V
1533:
407:
colour card was later made available. Six video modes were available, with resolutions from 64×64 in 4 colours, up to 256×192 in monochrome. At the time, 256×192 was considered to be high resolution.
1526:
1169:
removed and bypassed the internal regulators and powered their Atoms from an external 5V regulated power supply. Three amps were typically needed for a fully populated Atom.
1885:
1519:
1880:
387:") and 512 bytes for the screen (text mode) and only 512 bytes for programs (presumably in text mode, mode 0, and graphics not available), i.e. written in the
1236:
351:
without a disk drive but with an integral keyboard and cassette tape interface, sold in either kit or complete form. In 1980 it was priced between
1467:
1210:
1307:
1870:
108:
1802:
450:
for the 6502 assembly language which assembled the inline code during program execution and then executed it. This was unusual.
1687:
46:
1450:
383:
ROM was also available. The 2 KB of RAM was divided between 1 KB of Block Zero RAM (including the 256 bytes of "
1459:
89:
1164:
Power: standard 2.1 mm power jack connector for 8 volts unregulated DC, providing 5 volts regulated inside the Atom
249:
64×64 (4 colours), 64×96 (4 colours), 128×96 (monochrome), 64×192 (4 colours), 128×192 (2 colours), 256×192 (monochrome)
61:
359:
form, £170 (equivalent to £921 in 2023) ready assembled, to over £200 for the fully expanded version with 12
42:
1581:
1413:
1333:
427:
68:
35:
380:
1085:
834:
In late 1982, Acorn released an upgrade board for the Atom which allowed users to switch between Atom BASIC and
1890:
1875:
1561:
400:
1185:
switch-mode power supplies capable of supplying several amps are a readily and cheaply available alternative.
1387:
1360:
1643:
1116:
217:
75:
1228:
1692:
1566:
845:
The following is the memory map for the Atom. Shaded areas indicate those present on the minimal system.
1781:
1776:
1771:
1766:
57:
1479:
1214:
1158:
1147:
1128:
1089:
372:
234:
1120:
384:
344:
333:
223:
146:
134:
1791:
1761:
1638:
1100:
423:
1815:
1502:
1258:
1825:
1697:
1659:
447:
443:
439:
265:
1672:
1667:
1282:
1134:
376:
238:
1542:
1483:
1471:
1454:
411:
1493:
1464:
82:
1755:
1748:
1633:
1612:
356:
348:
306:
284:
340:. The BBC Micro began life as an upgrade to the Atom, originally known as the Proton.
1864:
1604:
1447:
1177:
435:
431:
329:
210:
347:-based machines that the company had been making from 1979. The Atom was a cut-down
1835:
1617:
379:, with the maximum specification machine having 12 KB of each. An additional
1506:
526:'"CODE NUMBER"T; REM Use code number to seed random number generator
1498:
1810:
1682:
206:
24:
1840:
1830:
1726:
1648:
1488:
1151:
296:
1786:
1627:
1556:
1182:
1093:
839:
835:
337:
316:
128:
1137:: 8 KB, expandable to 12 KB with various Acorn and 3rd party ROMs
1442:
360:
1677:
1576:
1571:
1820:
1742:
1104:
396:
280:
1511:
388:
1845:
1586:
276:
1515:
1176:
standard for external 5V connections, but using the same 7-pin
404:
352:
18:
469:
to be treated as a string. This sample program, adapted from
1476:
465:
ensioned and then referred to with the string operator
137:
first computer to be aimed squarely at the home market.
442:
could be included within a BASIC program, because the
1800:
1735:
1719:
1710:
1657:
1602:
1595:
1549:
847:
473:, demonstrates some of Atom BASIC's peculiarities:
466:
458:
454:
434:, which included indirection operators (similar to
312:
302:
291:
271:
261:
253:
245:
229:
216:
201:
186:
178:
160:
152:
142:
49:. Unsourced material may be challenged and removed.
1489:YouTube page totally dedicated to the Acorn Atom
336:from 1980 to 1982, when it was replaced by the
1033:Optional VIA I/O Device for Printer Interface
1527:
410:The case was designed by industrial designer
363:of RAM and the floating-point extension ROM.
8:
986:8000-85FF for mode 2 (1.5 KB graphics)
121:
1716:
1599:
1534:
1520:
1512:
1146:I/O Ports: Computer Users' Tape Standard (
1000:8000-97FF for mode 4 (6 KB graphics)
993:8000-8BFF for mode 3 (3 KB graphics)
979:8000-83FF for mode 1 (1 KB graphics)
453:String handling was unique. A byte vector
426:, a fast but idiosyncratic version of the
127:
120:
109:Learn how and when to remove this message
1886:Computers designed in the United Kingdom
1443:Yet another computer museum - Acorn Atom
16:Acorn Computers home computer, 1980–1982
1203:
1881:Computer-related introductions in 1980
1140:Sound: 1 channel, integral loudspeaker
965:8000-81FF for mode 0 (512 bytes text)
237:(expandable to 12 KB), 8 KB
1239:from the original on 19 November 2022
1131:: 2 KB, expandable to 12 KB
422:It had a built-in minor variation of
7:
1499:Javascript based Acorn Atom emulator
1306:Wheelwright, Geof (25 August 1983).
1235:. The Centre for Computing History.
1107:, was first configured on the Atom.
1092:, subsequently Managing Director of
182:£120 (in kit form), £170 (assembled)
47:adding citations to reliable sources
1217:. Object collection number Y2002.13
1084:The manual for the Atom was called
371:The minimum Atom had 2 KB of
343:The Atom was a progression of the
14:
414:of Cambridge Product Design Ltd.
23:
1062:Optional Disk Operating System
257:1 channel, internal loudspeaker
34:needs additional citations for
1494:Online museum of old computers
399:Video Display Generator (VDG)
1:
836:the more advanced "BBC BASIC"
1386:Kewney, Guy (October 1983).
1359:Liardet, Mike (March 1983).
1150:) interface, TV connector,
166:; 44 years ago
1907:
1086:Atomic Theory and Practice
1078:Cassette Operating System
471:Atomic Theory and Practice
428:BASIC programming language
241:(expandable to 12 KB)
1871:6502-based home computers
1414:"Busicomputers Prophet 3"
1334:"Busicomputers Prophet 2"
1189:Variants and applications
1072:
1066:
1054:
1009:
967:
949:Extension Text space RAM
938:
936:Floating-point variables
878:
126:
1161:audio cassette interface
1143:Size: 381×241×64 mm
957:Off-board Extension RAM
928:Sequential File buffers
475:
1392:Personal Computer World
1365:Personal Computer World
1259:"ATOM TECHNICAL MANUAL"
1172:There has never been a
1052:Optional Extension ROM
1041:ATOM BASIC Interpreter
1312:Personal Computer News
1229:"Acorn Atom Computers"
287:, 5V regulated inside.
1477:The complete Atom DVD
1448:The Acorn Atom Review
1017:Optional Utility ROM
1720:8-bit microcomputers
1711:Derivatives, clones,
1283:"EXPANDING THE ATOM"
1215:Science Museum Group
1159:Kansas City standard
1090:David Johnson-Davies
43:improve this article
1507:AtomSoftwareArchive
1211:Acorn Atom computer
1121:MOS Technology 6502
1088:and was written by
886:VDG CRT Controller
345:MOS Technology 6502
334:Acorn Computers Ltd
224:MOS Technology 6502
123:
1482:2012-04-25 at the
1470:2011-07-22 at the
1465:Acorn Atom in FPGA
1453:2011-05-20 at the
1388:"Prophet and loss"
1367:. pp. 124–126
1227:Whytehead, Chris.
912:Peripherals space
446:also contained an
424:Acorn System BASIC
179:Introductory price
1858:
1857:
1854:
1853:
1777:RiscStation R7500
1706:
1705:
1644:Business Computer
1550:Operating systems
1125:Speed: 1 MHz
1082:
1081:
920:Catalogue buffer
876:Teletext VDG RAM
444:BASIC interpreter
375:and 8 KB of
322:
321:
156:Personal Computer
119:
118:
111:
93:
1898:
1727:Prodest PC 128 S
1717:
1693:Network Computer
1668:Archimedes range
1600:
1536:
1529:
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1287:www.acornatom.nl
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1263:www.acornatom.nl
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1224:
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1208:
1154:parallel printer
1025:PPIA I/O Device
848:
830:
827:
824:
821:
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815:
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797:
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629:
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611:
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512:
509:
506:
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497:
494:
491:
488:
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482:
479:
468:
464:
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295:381×241×64
197:
195:
174:
172:
167:
131:
124:
114:
107:
103:
100:
94:
92:
51:
27:
19:
1906:
1905:
1901:
1900:
1899:
1897:
1896:
1895:
1891:8-bit computers
1876:Acorn Computers
1861:
1860:
1859:
1850:
1796:
1731:
1712:
1702:
1653:
1591:
1545:
1543:Acorn Computers
1540:
1484:Wayback Machine
1472:Wayback Machine
1455:Wayback Machine
1439:
1434:
1433:
1423:
1421:
1412:
1411:
1407:
1397:
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1221:
1209:
1205:
1200:
1191:
1113:
972:6 KB max.
971:
969:
941:5 KB max.
940:
865:Block Zero RAM
832:
831:
828:
825:
822:
819:
816:
813:
810:
807:
804:
801:
798:
795:
792:
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579:
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531:
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510:
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492:
489:
486:
483:
480:
477:
462:
420:
412:Allen Boothroyd
369:
193:
191:
170:
168:
165:
164:March 1980
147:Acorn Computers
138:
115:
104:
98:
95:
52:
50:
40:
28:
17:
12:
11:
5:
1904:
1902:
1894:
1893:
1888:
1883:
1878:
1873:
1863:
1862:
1856:
1855:
1852:
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1828:
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1813:
1807:
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1798:
1797:
1795:
1794:
1789:
1784:
1779:
1774:
1769:
1764:
1759:
1756:BeagleBoard-xM
1752:
1749:BeagleBoard-xM
1745:
1739:
1737:
1733:
1732:
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1723:
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1664:
1662:
1655:
1654:
1652:
1651:
1646:
1641:
1636:
1631:
1625:
1620:
1618:Systems 2 to 5
1615:
1609:
1607:
1605:microcomputers
1597:
1593:
1592:
1590:
1589:
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1579:
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1437:External links
1435:
1432:
1431:
1418:Chris's Acorns
1405:
1378:
1351:
1338:Chris's Acorns
1325:
1298:
1274:
1250:
1233:Chris's Acorns
1219:
1202:
1201:
1199:
1196:
1190:
1187:
1178:DIN connectors
1166:
1165:
1162:
1155:
1144:
1141:
1138:
1132:
1126:
1123:
1112:
1111:Specifications
1109:
1080:
1079:
1075:
1074:
1073:4 KB ROM
1071:
1068:
1064:
1063:
1060:
1056:
1055:
1053:
1050:
1046:
1045:
1044:4 KB ROM
1042:
1039:
1035:
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1031:
1027:
1026:
1023:
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901:
900:
897:
893:
892:
888:
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884:
880:
879:
877:
874:
870:
869:
868:1 KB RAM
866:
863:
859:
858:
855:
852:
476:
419:
416:
381:floating-point
368:
365:
349:Acorn System 3
320:
319:
314:
310:
309:
307:Acorn System 3
304:
300:
299:
293:
289:
288:
273:
269:
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263:
259:
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251:
250:
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214:
213:
211:Cassette tapes
205:100KB 5¼-inch
203:
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1613:Microcomputer
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1508:
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1501:- containing
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1409:
1406:
1394:. p. 126
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1234:
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1220:
1216:
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1207:
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1195:
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899:Optional FDC
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440:Assembly code
437:
436:PEEK and POKE
433:
432:Sophie Wilson
430:developed by
429:
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417:
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133:The Atom was
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99:February 2013
91:
88:
84:
81:
77:
74:
70:
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63:
60: –
59:
55:
54:Find sources:
48:
44:
38:
37:
32:This article
30:
26:
21:
20:
1836:Raspberry Pi
1639:Communicator
1622:
1422:. Retrieved
1420:. 2 May 2014
1417:
1408:
1396:. Retrieved
1391:
1381:
1369:. Retrieved
1364:
1361:"Prophet II"
1354:
1342:. Retrieved
1340:. 2 May 2014
1337:
1328:
1316:. Retrieved
1314:. p. 27
1311:
1308:"Adieu Atom"
1301:
1290:. Retrieved
1286:
1277:
1266:. Retrieved
1262:
1253:
1241:. Retrieved
1232:
1222:
1206:
1192:
1173:
1171:
1167:
1098:
1083:
939:Internal RAM
857:Annotations
851:Hex Address
844:
838:used by the
833:
470:
452:
421:
409:
394:
370:
342:
325:
323:
283:unregulated
207:floppy disks
187:Discontinued
161:Release date
143:Manufacturer
105:
96:
86:
79:
72:
65:
58:"Acorn Atom"
53:
41:Please help
36:verification
33:
1811:BeagleBoard
1713:compatibles
1688:Set-Top Box
1398:12 December
303:Predecessor
1865:Categories
1841:Touch Book
1831:PandaBoard
1816:DevKit8000
1803:dev boards
1736:32-bit PCs
1649:BBC Master
1460:Atom BASIC
1318:23 October
1292:2022-02-09
1268:2022-02-09
1243:28 January
1198:References
1152:Centronics
1099:The Acorn
1070:Assembler
401:video chip
395:It had an
326:Acorn Atom
292:Dimensions
233:2 KB
122:Acorn Atom
69:newspapers
1758:in Kiste)
1628:BBC Micro
1596:Computers
1557:Acorn MOS
1505:with the
1424:30 August
1371:3 October
1344:30 August
1183:wall-wart
1157:Storage:
1094:Acornsoft
970:BASIC RAM
968:Video and
854:Contents
840:BBC Micro
607:character
461:could be
448:assembler
385:zero page
338:BBC Micro
317:BBC Micro
313:Successor
1792:Titanium
1747:ARMini (
1634:Electron
1630:(Proton)
1480:Archived
1468:Archived
1451:Archived
1237:Archived
1174:de facto
559:'$ S
418:Software
367:Hardware
332:made by
266:Keyboard
1826:Pandora
1801:32-bit
1678:Risc PC
1658:32-bit
1582:Galileo
1577:RISC OS
1572:RISC iX
1503:ATOMMC2
490:Decoder
484:Encoder
355:120 in
246:Display
192: (
171:1980-03
169: (
135:Acorn's
83:scholar
1821:IGEPv2
1787:Iyonix
1743:A9home
1698:Phoebe
1603:8-bit
1105:Econet
652:modulo
640:number
637:random
625:letter
397:MC6847
230:Memory
222:1 MHz
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1846:i.MX6
1762:Omega
1754:BIK (
1683:A7000
1562:Panos
1067:F000
1059:E000
1049:D000
1038:C000
1030:B800
1022:B000
1014:A000
1005:9800
962:8000
954:3C00
946:2900
933:2800
925:2200
917:2000
909:1000
904:0A80
896:0A00
891:0900
883:0800
873:0400
862:0000
814:PRINT
556:INPUT
523:INPUT
389:BASIC
328:is a
279:, 1.5
272:Power
262:Input
254:Sound
202:Media
90:JSTOR
76:books
1772:Medi
1767:Mico
1623:Atom
1587:NCOS
1426:2022
1400:2021
1373:2021
1346:2022
1320:2021
1245:2024
1148:CUTS
826:GOTO
805:NEXT
730:THEN
724:<
682:GOTO
673:<
634:next
604:each
324:The
194:1982
190:1982
153:Type
62:news
1782:A75
1660:PCs
1567:ARX
1135:ROM
1129:RAM
1117:CPU
1101:LAN
823:120
811:110
802:100
703:RND
697:ABS
685:100
631:the
628:add
601:For
598:REM
586:LEN
565:FOR
541:ABS
502:TOP
481:REM
467:$ A
463:DIM
459:Z()
457:to
455:A()
405:PAL
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373:RAM
357:kit
239:ROM
235:RAM
218:CPU
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