The PMD 85 was a personal computer produced from 1985 by the companies Tesla Piešťany and Bratislava in the former Czechoslovakia. A personal computer ( PC) is any Computer whose original sales price size and capabilities make it useful for individuals and which is intended to be operated TESLA (from " TE chnika SLA boproudá") was a large state-owned electrotechnical conglomerate in the former Czechoslovakia Piešťany ( Pistyan Pöstyén Pieszczany is a town in Slovakia. Czechoslovakia may also refer to what is now the Czech Republic and Slovakia.
They were deployed en masse in schools throughout Slovakia, while the IQ 151 performed a similar role in Czech part of the country. Slovakia (long form Slovak Republic; Slovak:, long form, is a Landlocked country in Central Europe with a population of over five million The IQ 151 was a Personal computer produced by ZPA Nový Bor in the former Czechoslovakia.
PMD 85s were famous for their overheating problems, and were jokingly referred to as "coffee machines". A coffeemaker is a Kitchen appliance used to brew Coffee without having to boil water in a separate container
This computer was produced locally due to a lack of foreign currency with which to buy systems from the West. A currency is a unit of exchange, facilitating the transfer of Goods and/or services It is one form of Money, where money is The term Western world, the West or the Occident ( Latin: occidens -sunset -west as distinct from the Orient) can have multiple meanings After the fall of socialism in 1989, production of the PMD 85 was stopped. The " Velvet Revolution " (sametová revoluce nežná revolúcia ( November 16 &ndash December 29 1989) refers to a non-violent Year 1989 ( MCMLXXXIX) was a Common year starting on Sunday (link displays 1989 Gregorian calendar) PMD 85 was not competitive in quality or features compared to foreign PCs available at that time.
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Specifications
- MHB 8080A 2. 048MHz CPU
- 48 KB RAM
- 4 KB ROM
- System monitor
- Tape utilities
- TV output
- 288×256 resolution
- 4 levels of grayscale or colours, changeable in 6 pixel wide stripes
- tape recorder interface
- ROM module interface. The hertz (symbol Hz) is a measure of Frequency, informally defined as the number of events occurring per Second. A kilobyte (derived from the SI prefix Kilo -, meaning 1000 is a unit of Information or Computer storage equal to either 1024 A system monitor is a hardware- or software- based system used to monitor resources and performance in a computer system Television ( TV) is a widely used Telecommunication medium for sending ( Broadcasting) and receiving moving Images, either monochromatic The display resolution of a Digital television or Computer display typically refers to the number of distinct pixels in each dimension that can be displayed In Computing, a grayscale or greyscale Digital image is an image in which the value of each Pixel This article deals mainly with analog tape recorders for audio applications information on digital recording, recording of video signals, and A ROM module with the BASIC programming language was a standard part of the computer, but there were more ROM modules designed and produced, containing Pascal, LOGO and more. In Computer programming, BASIC (an Acronym for Beginner's All-purpose Symbolic Instruction Code) is a family of High-level programming languages Pascal is an influential imperative and procedural Programming language, designed in 1968/9 and published in 1970 by Niklaus Wirth as a small Logo is a Computer programming language used for Functional programming.
Variants
- The PMD 85, first version, produced by Tesla Piešťany, was originally in a white-coloured case and later in some other colours. White is a Color, the perception which is evoked by Light that stimulates all three types of color sensitive Cone cells in the Human eye It was more of a prototype and is quite rare today.
- The PMD 85, second version, produced by Tesla Bratislava, was known as "the" PMD 85, and sometimes labeled as PMD 85-1. It was made with a dark gray case, and was famous for its keyboards with extremely tough keys. In Computing, a keyboard is an Input device partially modelled after the typewriter keyboard which uses an arrangement of buttons or keys
- The PMD 85-2 introduced some improvements in BASIC, some in input routines (for instance, key autorepeat), and a much more ergonomic keyboard (but much less mechanically reliable). Some of the changes caused it to be not completely backward compatible. In Technology, especially Computing (irrespective of platform a product is said to be backward compatible when it is able to take the place of an older product
- The PMD 85-2A used different hardware, leading to less overheating of the memory chips, an additional 8 KB RAM and more memory for BASIC, but was otherwise compatible with PMD 85-2.
- The PMD 85-2B had 64 KB memory modules instead of 16 KB
- The PMD 85-3 added colour TV output – former versions had colour output only when used with a monitor – and some more hardware changes, including mapping all the address space into RAM, which meant it could be made almost 100% compatible with previous models by loading their ROM in appropriate memory locations. Character encoding included all Czech and Slovak characters, and a Cyrillic version was also produced. A character encoding consists of a code that pairs a sequence of characters from a given character set (sometimes incorrectly referred to as Code page Slovakia (long form Slovak Republic; Slovak:, long form, is a Landlocked country in Central Europe with a population of over five million The Cyrillic alphabet (səˈrɪlɪk also called azbuka, from the old name of the first two letters is actually a family of Alphabets, subsets of which are used by
The PMD 85-2 was an inspiration for the MAŤO personal computer, also sold as a self-assembly kit. The Maťo was an 8-bit Personal computer produced in the former Czechoslovakia by Štátny majetok Závadka š It had different hardware and very limited compatibility with PMD; its BASIC, memory structure and I/O were almost, but not completely the same, but tape format was different. It was intended as a home computer, but never really caught on.
Later, the Didaktik Alfa and Beta were produced as more reliable clones. The Didaktik was a series of Home computers based on the Intel 8080 and Zilog Z80 processors produced in former Czechoslovakia
See also
External links
The Maťo was an 8-bit Personal computer produced in the former Czechoslovakia by Štátny majetok Závadka šDapyx Software network: MP3 Explorer | Ebook Manager | Zenithic