mirror of
https://github.com/AppleWin/AppleWin.git
synced 2024-11-17 21:04:45 +00:00
53 lines
3.2 KiB
HTML
53 lines
3.2 KiB
HTML
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<title>Pravets Clones</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
|
||
|
|
</head>
|
||
|
|
<body style="FONT-FAMILY: verdana; BACKGROUND-COLOR: rgb(255,255,255)" alink="#008000"
|
||
|
|
link="#008000" vlink="#008000">
|
||
|
|
<h2 style="COLOR: rgb(0,128,0)">Pravets Clones</h2>
|
||
|
|
<hr size="4">
|
||
|
|
<p style="FONT-WEIGHT: bold">Background:</p>
|
||
|
|
<p>
|
||
|
|
In the 80's Bulgaria was the biggest computer manufacturer in this part of the world.
|
||
|
|
Also - first in the world
|
||
|
|
- for the proportion of manufactured computers per person
|
||
|
|
in the country.<br>
|
||
|
|
</p>
|
||
|
|
<p style="FONT-WEIGHT: bold">History:</p>
|
||
|
|
<p>
|
||
|
|
IMKO 1 and IMKO 2 were the first models (circa 1980 and 1982); in 1983 IMKO 2 was renamed to Pravetz 82,
|
||
|
|
because Todor Zhivkov (Bulgarian government and communist party leader at this time) was from Pravetz -
|
||
|
|
a small town, near to Bulgaria's capital city, Sofia.<br>
|
||
|
|
<br>
|
||
|
|
IMKO 1,2 and Pravetz 82 were almost identical clones of the Apple ][. Then the Pravetz factory built the Pravetz 8M (which was unique at the time)
|
||
|
|
because of its 2 onboard CPU's - 6502 & Z80 (used as a built-in CP/M module). It also had 64 KB of RAM onboard
|
||
|
|
(16 KB as built-in RAM expansion in slot 0).<br>
|
||
|
|
<br>
|
||
|
|
In the following years they also built: Pravetz 8E, 8A, 8C and 8S - clones of Apple //e.<br>
|
||
|
|
. 8E didn't have the Cyrillic font, unlike all other models, it had lowercase and
|
||
|
|
capital Latin letters, like original Apple's.<br>
|
||
|
|
. 8A have 2 additional basic commands, 8 bit code-pages, mini-assembler, allowed
|
||
|
|
the use of hex codes in BASIC and some additional subroutines
|
||
|
|
in the built-in ROM. Unfortunately, some important entry points of the monitor (ROM) program were changed, so it was not 100%
|
||
|
|
compatible with older Apple (and Pravetz) models. This is easily corrected by changing some code (usually JMP in binary
|
||
|
|
programs or CALL, POKE, PEEK
|
||
|
|
in BASIC programs), but not very simple, especially for ordinary users.<br>
|
||
|
|
. 8C was a stripped down version of 8A (so like the Apple //c) but its size wasn't smaller, like //c. It was without an auxiliary slot
|
||
|
|
of 8A (Apple //e), instead it had 64 KB RAM built-in to its address space. It also had a CM630 CPU (6502 analogue), which had
|
||
|
|
some bugs when used with the CP/M module. 8C also had a built-in RGB module for color monitor (slot 7) and of course the improved
|
||
|
|
80 column card of the Apple //e, like 8E and 8A.<br>
|
||
|
|
. 8S was a further improved version of 8C with a possibility to change DRAM chips to 1 MB of memory.
|
||
|
|
(It was possible to do this with Pravetz 8C and the expansion card of 8A: in order to have 1060 MB of memory.)<br>
|
||
|
|
<br>
|
||
|
|
There were also other Pravetz models:<br>
|
||
|
|
. 8D was a version of the Oric/Atmos - "D" means "Dom" - "Home" in Bulgarian.<br>
|
||
|
|
Other models were 16 bit - IBM PC XT and AT clones:<br>
|
||
|
|
. Pravetz 16, Pravetz 16, Pravetz 16A, Pravetz 16H, Pravetz 16T (with Nec V20 CPU)<br>
|
||
|
|
. Pravetz 286 (286 CPU), Pravetz 386 (with 386 CPU) and Pravetz 486 - experimental, only a few were manufactured.</p>
|
||
|
|
<br>
|
||
|
|
Thanks to Stanislav Georgiev for this information.
|
||
|
|
</body>
|
||
|
|
</html>
|