28:
918:
1813:
372:
597:
494:
1657:
737:
1651:
891:
It was equipped with two 5¼″ drives typically K5600 made in East
Germany (users complained about the quality of these drives) with a capacity of about 100 KB. But other manufacturers' drives could also be used, eg Bulgarian IZOT 5255E. Supported disk capacities are 100 KB (single density)
191:
The reception of the computer was initially positive, it was seen as the first Polish personal computer. Later opinions tend to be critical. The press pointed out technical specification is not impressive, especially lack of graphic mode. Besides, TRS-80 was an unknown computer in Poland. There was
180:
From 1984 to 1986 Mera–Elzab produced 2,500 units. The maximum production capacity of the plant was 4000 units per year. The computer was assembled in one room, where 5 people worked. Production of one computer consumed 20 man–hours. The computer accounted for 1% of the production value and at the
158:
The company expected that due to the price the computer would not be available for individual users. Small businesses were the primary target market, followed by research and education institutions. They expected the computer would be also used as an industrial controller.
851:
The memory has been expanded to 32 KB or 48 KB. In the latter case, 64 KB were mounted but addresses colliding with ROM were not available. There were some changes in ROM adding support for disk drive, parallel printer and second timer chip as a
533:. Character generator resided in separate ROM memory, there was also separate 1 KB of video memory. Similar to TRS-80 there were no lower case characters. No Polish-specific characters (ĄĘĆŚÓŃŁŻŹ) on the keyboard and character table.
994:
In 1985, Mera–Elzab submitted to the
Ministry of Education a proposal to create a network version of a computer for Polish schools. In this configuration, the Meritum II computer with a connected disk drive would act as a
195:
The computer never became popular, mostly because of a low number of units produced, the price and technical specification were not competitive to other products, and lack of software and documentation.
604:
At the end of the first year of production, the computer was slightly modified by adding support for Polish characters on the screen, a keyboard with Polish characters and the memory was expanded.
162:
The fathers of the computer were
Zygmunt Korga, later technical director of Mera–Elzab and Paweł Podsiadło, an employee of ITM company. They were friends from the time of study at the
862:
Version with ROM memory to reduced to 8 KB existed. It stored procedures to load the program automatically from disk at startup. The computer could work under the control of
1542:
1842:
1234:
188:
company and terminated production. In 1987 Elwro finished production of
Meritum as it started manufacturing its personal computer for schools Elwro 800 Junior.
586:
was available. Thanks to this chip the computer could generate sound (1 channel), initially using built-in speaker later using an amplifier in a monitor.
1551:
1535:
1097:(in Polish). Vol. 5, 6, no. 52, 55. Zrzeszenie Producentów Środków Informatyki, Automatyki i Aparatury Pomiarowej "Mera". pp. 3–6.
529:
Display circuit was similar to TRS-80, it supported 64×16 or 32×16 monochrome text mode only; low resolution 128×48 graphic mode simulated by
1038:
1288:
1073:(in Polish). Vol. 10, no. 256. Zrzeszenie Producentów Środków Informatyki, Automatyki i Aparatury Pomiarowej "Mera". pp. 3–6.
91:
in Poland. Mera–Elzab analyzed existing western small computer systems and the following aspects were taken into account for a new product:
1528:
1441:
902:/s for double density disks or 125 kbit/s for single density. The computer and the disk unit were connected by a 25–wire cable.
1635:
1003:
163:
27:
69:
In the 1980s, Mera–Elzab was in the group of 500 largest Polish industrial enterprises and 100 largest exporters. It produced
1798:
522:
14 KB of ROM consisted of 12 KB BASIC. It was slightly modified TRS-80 Model I BASIC Level II. In additional 2 KB,
483:
170:
881:
It was a separate specialized computer based on the Z80 processor @ 2 MHz with 2 KB EPROM and 1 KB RAM.
487:
547:, it was not possible to connect directly to the TV. An external TV adapter working in channels 1–6 was available.
1520:
1013:
was later selected for schools. The
Meritum network variant was not produced, only experimental units were made.
76:
ITM was a small foreign company operating in Poland selling measuring systems. In Poland under the rule of the
1422:(in Polish). Vol. 12. Krajowe Wydawnictwo Czasopism RSW "Prasa-Książka-Ruch". December 1988. p. 12.
1399:(in Polish). Vol. 12. Krajowe Wydawnictwo Czasopism RSW "Prasa-Książka-Ruch". December 1987. p. 10.
1837:
895:
The computer was supplied with a diskette with the Disk-BASIC which was an extension of the standard BASIC.
795:
420:
1772:
173:
in the autumn of 1983. Production began in the summer of 1984. Preparation for production cost 10 million
1476:(in Polish). Vol. 4. Krajowe Wydawnictwo Czasopism RSW "Prasa-Książka-Ruch". July 1986. p. 48.
1587:
1582:
878:
Placed in a large 360×192×315 mm housing with a weight of 12.5 kg (with power supply for both devices).
596:
550:
The computer was equipped with parallel and serial port not compatible with TRS-80 Expansion
Interface.
308:
88:
859:
A second universal I/O chip 8255 (MCY7855) has been added for communication with the floppy disk unit.
50:
Model I with BASIC Level II. Manufactured in the 1980s by Mera–Elzab in cooperation with ITM company.
1816:
1734:
1090:
1066:
980:
1333:(in Polish). Vol. 3. Krajowe Wydawnictwo Czasopism RSW "Prasa-Książka-Ruch". pp. 14–15.
1126:
996:
62:
available for the general public in Poland. The Polish computer industry was manufacturing only
1793:
1665:
1477:
1423:
1400:
1374:
1334:
1296:
1270:
1184:
1134:
1098:
928:
917:
898:
The 8255 chip was used for communication with the
Meritum computer. Data transmission was 250
760:
590:
385:
371:
70:
43:
1624:
943:
785:
523:
410:
110:
1719:
1576:
973:
885:
816:
536:
493:
454:
441:
81:
73:, monitors, and computers, but did not manufacture products for the mass consumer market.
174:
1729:
1571:
501:
96:
1065:
Korga, Zygmunt; Smoliński, Andrzej; Lipowski, Jacek; Podsiadło, Paweł (October 1983).
1831:
1630:
1602:
1597:
1592:
553:
540:
59:
888:, the 8272 chip was used, which was able to handle single and double density disks.
1724:
1694:
1656:
1640:
1010:
557:
544:
530:
458:
333:
152:
151:
clone) could be used for both the Z80 and U880. Memory chips were available in the
144:
117:
1207:
736:
564:. It could be used to control industrial processes or other peripherals. Although
1511:
Dokumentacja
Techniczno–Rozruchowa Stacja Dysków Elastycznych Meritum nr 44290000
1002:
The network project was developed by scientists from the
Computing Center of the
147:. Peripheral chips produced in Poland by CEMI factory for the MCY7880 processor (
1754:
1744:
1739:
1689:
1679:
568:
printer may be connected, there was no software support for that option in ROM.
283:
87:
Design of the
Meritum began in 1982. It was a time of major economic crisis and
84:. One exception was the companies owned by foreigners, often Polish emigrants.
1788:
1619:
1614:
1609:
853:
583:
572:
561:
469:
148:
124:
1481:
1427:
1404:
1378:
1369:
Wojciechowski, Roman (September 1985). "Swego nie znacie Meritum w Elzabie".
1338:
1300:
1274:
1188:
1138:
1102:
1295:(in Polish). Vol. 10. Wydawnictwo NOT SIGMA. October 1984. p. 25.
565:
204:
Free market prices in 1986. The average salary in that year was 24,095 PLZ.
136:
77:
63:
1262:
1650:
31:
Meritum I (left) and Meritum I model 2 (right) machines, Unimor monitor.
969:
The graphic mode was added: monochrome 512×192 or 256×192 (4 colors).
899:
100:
17:
1704:
1684:
1565:
867:
47:
40:
1373:(in Polish). Vol. 5–6. RSW "Prasa-Książka-Ruch". pp. 5–6.
1269:(in Polish). Vol. 1. RSW "Prasa-Książka-Ruch". pp. 20–21.
966:
Not mass-produced, only 100 to 300 pre production units were made.
1040:
BASIC – Meritum. Podręcznik programowania i użytkowania nr 44990001
829:
Composite video, 64×16, 32×16 text; 128×48 semigraphics; monochrome
169:
The computer was presented to the public for the first time at the
1699:
595:
497:
492:
185:
132:
26:
1133:(in Polish). Vol. 1. Wydawnictwo NOT SIGMA. pp. 17–18.
863:
800:
576:
526:
program was stored. Content of ROM was provided by ITM company.
479:
425:
258:
140:
1524:
1552:
TRS-80 and Tandy-branded computers, clones and related systems
1418:"Komputeryzujmy się "Dlaczego Meritum przegrało z Juniorem"".
1183:(in Polish). Vol. 5, no. 84. Wydawnictwo NOT SIGMA.
99:, peripheral and memory chips must be available in Poland or
1125:
Chrześcijański, Zbigniew; Żebrowski, Jacek (January 1985).
376:
Meritum I with monitor. Box on the right is power supply.
741:
Meritum II with a printer, monitor and floppy disk unit.
1513:(in Polish). Zakłady Urządzeń Komputerowych Mera–Elzab.
1043:(in Polish). Zakłady Urządzeń Komputerowych Mera–Elzab.
192:
no software or technical documentation on the market.
123:
Possibility to connect existing peripherals (printer,
58:
In the late 1970s and early 1980s, there was no small
1179:
Górny, Jarosław (May 1985). "Mikrokomputer Meritum".
1120:
1118:
1116:
1114:
1112:
1781:
1765:
1664:
1558:
1390:
1388:
1084:
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1080:
952:
942:
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746:
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1312:
1310:
1060:
1058:
1056:
1054:
1052:
1050:
482:processor at 2.5 MHz. 17 KB of RAM (16 KB of
66:systems but not small computers for personal use.
986:It could work with Meritum II floppy drive unit.
856:(which was never installed in production units).
135:Level II was selected. It was a computer using a
131:Based on the above assumptions, TRS Model I with
1505:
1503:
1501:
1499:
1497:
1495:
1493:
1491:
1329:Majewski, Władysław (June 1986). "Oto Meritum".
1256:
1254:
1252:
1250:
1248:
1246:
593:can be used. Transmission speed was 500 baud.
1033:
1031:
1029:
1536:
999:, student computers were based on Meritum I.
983:were added. The keyboard layout was changed.
976:signal on separate DIN socket was available.
8:
1229:
1227:
1174:
1172:
1170:
1168:
910:
729:
677:Static RAM 1 KB + 1 KB video RAM.
364:
80:, all companies (including Mera–Elzab) were
1166:
1164:
1162:
1160:
1158:
1156:
1154:
1152:
1150:
1148:
870:2.3). BASIC was provided on a floppy disk.
1655:
1649:
1543:
1529:
1521:
1009:Finally, the Ministry rejected the offer.
916:
909:
735:
728:
370:
363:
979:The second serial port and one joystick
606:
206:
139:processor that could be replaced by the
1025:
184:In 1986 Mera–Elzab sold the licence to
1843:Computer-related introductions in 1984
575:); transmission rates from 95 to 9600
1442:"Przeciętne wynagrodzenie od 1950 r."
1095:Biuletyn Techniczno-Informacyjny MERA
1071:Biuletyn Techniczno-Informacyjny MERA
958:64 or 32×16 text; 128×48 semigraphics
510:. Some versions displayed translated
490:); 16 KB version was also available.
7:
1202:
1200:
1198:
1261:Krupa, Krzysztof (September 1985).
600:Meritum charset with Polish letters
582:In addition, hardware counter chip
571:Serial port used MCY7851 (clone of
106:TV or a cheap monitor as a display.
25:
1636:Tandy 10 Business Computer System
1004:Silesian University of Technology
164:Silesian University of Technology
1812:
1811:
1263:"Na razie nie widać konkurencji"
1091:"Mikrokomputer osobisty Meritum"
1089:Korga, Zygmunt (May–June 1984).
1067:"Komputer osobisty(?) - Meritum"
866:2.2 or MER-DOS (compatible with
636:Processor made in East Germany.
543:. Due to the lack of a built-in
1289:"Mikroinformatyki coraz więcej"
938:100-300 units were manufactured
892:or 180 KB double density.
560:chip which was Polish clone of
556:was based on MCY7855 universal
200:Comparison with other computers
1799:Tandy Video Information System
691:Universal I/O made in Poland.
650:2 KB EPROM made in USSR.
1:
539:signal available on standard
508:MERA ELZAB-ITM BASIC PC
415:TRS-80 Model I BASIC Level II
181:best moment no more than 3%.
705:Serial port made in Poland.
457:, 64×16, 32×16 text; 128×48
177:which was relatively cheap.
835:Meritum II consists of the
772:; 39 years ago
397:; 41 years ago
1859:
1236:Flyer "Mera-Elzab Meritum"
664:Dynamic RAM made in USSR.
503:RADIO SHACK LEVEL II BASIC
1807:
1647:
1127:"Mikrokomputer Meritum-I"
915:
839:computer and an external
734:
369:
171:Poznań International Fair
960:512 or 256×192, 4 colors
956:RGB and Composite video
1773:Tandy Graphics Adapter
1395:"Komputeryzujmy się".
601:
589:As mass storage, only
519:
32:
1588:Tandy Pocket Computer
1583:TRS-80 Color Computer
843:with two 5¼″ drives.
599:
496:
30:
811:32, 48 or 64 KB
506:message replaced to
1817:RadioShack template
912:
731:
609:
366:
95:System components:
1710:Mera-Elzab Meritum
718:Hardware counter.
607:
602:
520:
44:personal computers
33:
1825:
1824:
1794:Tandy Corporation
1568:Model I & III
964:
963:
929:Personal computer
847:Meritum I model 2
837:Meritum I model 2
833:
832:
817:Removable storage
790:CP/M 2.2, MER-DOS
761:Personal computer
752:Meritum I model 2
722:
721:
591:cassette recorder
476:
475:
442:Removable storage
386:Personal computer
357:
356:
116:Tape recorder as
16:(Redirected from
1850:
1815:
1814:
1676:Original TRS-80
1659:
1653:
1625:TRS-80 Model 100
1545:
1538:
1531:
1522:
1515:
1514:
1507:
1486:
1485:
1469:
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1304:
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1222:
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1219:
1218:
1212:oldcomputer.info
1208:"Meritum - MCbx"
1204:
1193:
1192:
1176:
1143:
1142:
1122:
1107:
1106:
1086:
1075:
1074:
1062:
1045:
1044:
1035:
1011:Elwro 800 Junior
944:Operating system
920:
913:
874:Floppy disk unit
841:floppy disk unit
786:Operating system
780:
778:
773:
749:
739:
732:
610:
608:Main components
517:
513:
500:startup screen.
436:16 or 17 KB
411:Operating system
405:
403:
398:
374:
367:
207:
109:The software in
21:
1858:
1857:
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1849:
1848:
1847:
1828:
1827:
1826:
1821:
1803:
1777:
1761:
1716:Color Computer
1670:related systems
1669:
1660:
1654:
1645:
1577:TRS-80 Model II
1554:
1549:
1519:
1518:
1509:
1508:
1489:
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1181:Radioelektronik
1178:
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1088:
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1036:
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990:Network version
959:
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886:disk controller
876:
854:sound generator
849:
776:
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771:
747:
742:
727:
579:were possible.
537:Composite video
515:
511:
455:Composite video
401:
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362:
228:Sound channels
202:
56:
23:
22:
15:
12:
11:
5:
1856:
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1838:Home computers
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1572:TRS-80 Model 4
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803:@ 2.5 MHz
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225:Graphics mode
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39:– a family of
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1751:TRS-80 MC-10
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1631:Tandy 1400 LT
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748:Also known as
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554:Parallel port
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446:Cassette Tape
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60:microcomputer
53:
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29:
19:
1766:Technologies
1735:CP 400 COLOR
1725:Dragon 32/64
1709:
1695:Colour Genie
1641:TRS-80 MC-10
1510:
1473:
1449:. Retrieved
1444:
1436:
1419:
1413:
1396:
1370:
1330:
1292:
1283:
1266:
1235:
1215:. Retrieved
1211:
1180:
1130:
1094:
1070:
1039:
1015:
1008:
1001:
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985:
978:
971:
968:
965:
906:Meritum III
897:
894:
890:
883:
880:
877:
861:
858:
850:
840:
836:
834:
767:Release date
622:Description
603:
588:
581:
570:
552:
549:
545:TV modulator
535:
531:semigraphics
528:
521:
507:
502:
477:
461:; monochrome
459:semigraphics
392:Release date
334:Commodore 64
233:
203:
194:
190:
183:
179:
168:
161:
157:
153:Soviet Union
145:East Germany
130:
118:mass storage
86:
75:
68:
57:
36:
34:
1755:Matra Alice
1690:Video Genie
1680:Aster CT-80
1579:/12/16/6000
1447:(in Polish)
1293:Informatyka
1239:(in Polish)
1131:Informatyka
972:Additional
911:Meritum III
821:Floppy disk
616:Equivalent
516:ROZMIAR PAO
512:MEMORY SIZE
472:, 1 channel
309:Atari 800XL
284:ZX Spectrum
89:martial law
82:state-owned
35:Mera–Elzab
1832:Categories
1789:RadioShack
1620:Tandy 3000
1615:Tandy 2000
1610:Tandy 1000
1472:"Giełda".
1451:2019-09-22
1217:2023-03-24
1020:References
935:Units sold
730:Meritum II
725:Meritum II
573:Intel 8251
566:Centronics
562:Intel 8255
541:DIN socket
470:Intel 8253
222:Text mode
213:Price PLZ
149:Intel 8080
125:punch tape
78:communists
1482:0860-2514
1428:0860-2514
1405:0860-2514
1379:0860-1674
1339:0860-2514
1301:0542-9951
1275:0860-1674
1189:0137-6802
1139:0542-9951
1103:0239-6645
486:and 1 KB
478:Based on
365:Meritum I
360:Meritum I
234:Meritum I
210:Computer
137:Zilog Z80
97:processor
71:terminals
64:mainframe
46:based on
1782:See also
1740:Color 64
1474:Komputer
1420:Komputer
1397:Komputer
1331:Komputer
981:DB9 port
696:MCY7851
682:MCY7855
655:K565RU3
641:K573RF2
350:320×200
338:175,000
325:320×192
300:256×192
288:120,000
238:103,000
216:Release
143:made in
127:reader).
1730:MX-1600
1720:CD-6809
953:Display
884:As the
826:Display
775: (
524:monitor
451:Display
400: (
313:95,000
263:35,000
250:128×48
219:RAM KB
113:memory.
101:Comecon
54:History
37:Meritum
18:Meritum
1705:Max-80
1685:LNW-80
1666:Clones
1566:TRS-80
1559:Series
1480:
1426:
1403:
1377:
1371:Bajtek
1337:
1299:
1273:
1267:Bajtek
1187:
1137:
1101:
997:server
868:TRSDOS
808:Memory
627:U880D
619:Count
433:Memory
347:40×25
322:40×24
297:32×24
275:64×48
272:32×24
247:64×16
48:TRS-80
41:Polish
1745:VC 50
1700:D8000
710:8253
699:8251
685:8255
669:2114
658:4116
644:2716
613:Chip
498:BASIC
466:Sound
341:1982
316:1983
291:1982
269:1+16
266:1981
241:1983
186:Elwro
133:BASIC
1627:/200
1603:PC-3
1598:PC-2
1593:PC-1
1478:ISSN
1424:ISSN
1401:ISSN
1375:ISSN
1335:ISSN
1297:ISSN
1271:ISSN
1185:ISSN
1135:ISSN
1099:ISSN
948:CP/M
925:Type
900:kbit
864:CP/M
801:U880
777:1985
770:1985
757:Type
630:Z80
584:8253
577:baud
488:SRAM
484:DRAM
480:U880
426:U880
402:1983
395:1983
382:Type
259:ZX81
141:U880
1445:ZUS
974:RGB
796:CPU
558:I/O
514:as
421:CPU
344:64
319:64
294:48
244:48
175:PLZ
111:ROM
1834::
1490:^
1460:^
1387:^
1347:^
1309:^
1291:.
1265:.
1245:^
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1197:^
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1006:.
715:1
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353:3
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278:0
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155:.
1668:,
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1191:.
1141:.
1105:.
779:)
518:.
404:)
120:.
103:.
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
