8D - ConSolo

ID	Pravetz 8D
Short Name
Name	8D
Company	Pravetz
Description	The Pravetz 8D was a Bulgarian clone of the Oric Atmos featuring a Bulgarian version of the 6502 processor called CM630, 16 KB of ROM and 48 KB of RAM The keyboard was almost the same as the original Atmos version, including a MK key, similar to the CTRL key, a C/L key allowing to display Cyrillic or Latin alphabets, and cursor keys. As in Pravets 82 (etc), the original lowercase characters were replaced by cyrillic characters and the C/L lock key, was the CAPS LOCK key of the Oric Atmos. Like the original Atmos, The 8D had two modes of recording : Fast mode at 2400 bits/sec. and slow mode at 300 bits/sec. The computer also featured a parallel Centronics interface and a user port. Pravetz provided a local dot matrix printer called "Petritch" but the popular Epson printers could be also connected to the 8D. The "D" after Pravets 8 stays for "???????" (Domashen = For home use), and the idea was, that it should be used without having to buy any peripherals - monitor (which couldn't be connected through composite video to a Pravets 8D without modification) and FDD (cassete recorder used instead). Floppy drives, modem and joysticks were also available. Floppy disk drives were very hard to find (in fact they appeared only in the early nineteens). They were a modification of the Pravetz 82 FDDs but with a built-in controller, making them two times bigger. Probably that was one of the reasons why Pravetz 8D never achieved the popularity ot Pravetz 8 (despite of the 3 times lower price). There were in fact two ways to have floppy disk drives for the Pravetz 8D. One was indeed to use Pravetz 82 FDD and to develop an additional controller + power supply (the schematic and firmware were published in "Computer for you" magazine). There was an operating system called DOS 8D, developed in Bulgaria by Borislav Zahariev. Later, Pravetz factory decided to develop special FDD for the 8D, which was bundled with the controller and the power supply in a box twice bigger than the normal Apple ][ floppy. It came out on market when the production of the computer itself was finished! It used also modified version of DOS 8D for DIY floppy. The computer was very well crafted and the survived systems often look as new. ___________ Contributed to this page : Bozhidar Stefanov, Jordan, anonymous visitor Peter Petrov reports: ROM There are several rom images of the basic in Pravetz. If you wand disk emulation you need 8DControllerROM and use CALL#320 command. RAM With Basic you have 48 K RAM to work, but with this little schematics you can use additional 16K. The signals that you need for proper work are these. One trigger is used to form MAP signal, but second is free to use additional thing. If you realise schematis of disk controller below you can use these schematics together to load 8DDOS v2.10 in additional RAM. You must use write operation in these adresses to use the controller: #380 - writing in additional RAM - additional thing is off #381 - writing and reading in additional RAM - additional thing is off #382 - writing in additional RAM - additional thing is on #383 - writing and reading in additional RAM - additional thing is on for "additional thing" see Disk controller section So, if you realise this little controller you can use: FOR I = #C000 TO #CFFF : POKE I,0 : NEXT - clearing first 4K of additional RAM or you can move the basic interpreter in additional memory and use: POKE #381,0 to go in RAM interpreter and make changes in it. DISK CONTROLLER If you have Apple ][ floppy drive and disk controller you can use this schematics to connect them to your Pravetz (Oric). The schematics is from two parts: buffers controller The signals for proper work of the controller are here: You can change the signal Q with changing the resistors of monovibrator 74LS123. The record of EPROM is here: You must write it from addres #20 of the EPROM. Connecting RAM controller and disk controller: you can connect these controllers by this way: pin 9 of 74LS74 is connecting to A8 addres bar of 2716 EPROM, so the "additional thing" is second page of the EPROM, where is the program of loading DOS 8D v.2.1 into additional RAM. (The record of the EPROM above is exatly for first and second page). SOFTWARE The versions of the DOS I have are: Dos 8D v1.0 - you can use it if you realise only the schematics of the disk controller, but this versions loads in normal RAM, so it is unusable with long games. Dos 8D v.2.1 - you can use it if you realise the two schematics and connect them. So - dos loads in additional RAM and you can use all the programs you have. You can use regular Oric software in Pravetz 8D, but you have not regular letters. You have cyrillic letters instead. Changing of the keyboard maps is with Ctrl-T. There are some games for Pravetz like SnakeByte, Tetris (exellent clone) and other. Most of them are from Bulgarian computer magazine "Computer for you". There is 80 column text editor, Disk copier program and the most beautiful - Borislav Zahariev ported BigMac Assembler from Apple ][ to Pravetz, so you can use if you realise schematics above. Soon I hope you will see this software here.
Date Available	1985
Type	Computer
Emulators
Alternate Names	Pravetz 8D
Links
Matches	oldcomputers 988 tosec Pravetz 8D - Games - [DSK]

oldcomputers	988	{ "type_id": 1, "id": 988, "pages": { "photos": "photos.asp?t=1&c=988&st=1", "links": "links.asp?c=988&st=1", "docs": "docs.asp?c=988&st=1", "comments": "forum.asp?c=988&st=1" }, "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_1.jpg", "company_link": "company.asp?st=1&m=218", "company_name": "Pravetz", "company_logo": "https://www.old-computers.com/museum/logos/Pravetz_Logo.gif", "description": "The Pravetz 8D was a Bulgarian clone of the <a href=\"computer.asp?c=79\">Oric Atmos</a> featuring a Bulgarian version of the 6502 processor called CM630, 16 KB of ROM and 48 KB of RAM\nThe keyboard was almost the same as the original Atmos version, including a MK key, similar to the CTRL key, a C/L key allowing to display Cyrillic or Latin alphabets, and cursor keys. As in <a href=\"computer.asp?c=956\">Pravets 82</a> (etc), the original lowercase characters were replaced by cyrillic characters and the C/L lock key, was the CAPS LOCK key of the Oric Atmos.\nLike the original Atmos, The 8D had two modes of recording : Fast mode at 2400 bits/sec. and slow mode at 300 bits/sec.\nThe computer also featured a parallel Centronics interface and a user port. Pravetz provided a local dot matrix printer called \"Petritch\" but the popular Epson printers could be also connected to the 8D.\nThe \"D\" after Pravets 8 stays for \"???????\" (Domashen = For home use), and the idea was, that it should be used without having to buy any peripherals - monitor (which couldn't be connected through composite video to a Pravets 8D without modification) and FDD (cassete recorder used instead).\nFloppy drives, modem and joysticks were also available. Floppy disk drives were very hard to find (in fact they appeared only in the early nineteens). They were a modification of the <a href=\"computer.asp?c=956\">Pravetz 82</a> FDDs but with a built-in controller, making them two times bigger. Probably that was one of the reasons why Pravetz 8D never achieved the popularity ot Pravetz 8 (despite of the 3 times lower price).\nThere were in fact two ways to have floppy disk drives for the Pravetz 8D. One was indeed to use Pravetz 82 FDD and to develop an additional controller + power supply (the schematic and firmware were published in \"Computer for you\" magazine). There was an operating system called DOS 8D, developed in Bulgaria by Borislav Zahariev.\nLater, Pravetz factory decided to develop special FDD for the 8D, which was bundled with the controller and the power supply in a box twice bigger than the normal Apple ][ floppy. It came out on market when the production of the computer itself was finished! It used also modified version of DOS 8D for DIY floppy.\nThe computer was very well crafted and the survived systems often look as new.\n___________\n<font color=\"#666666\">Contributed to this page : <b>Bozhidar Stefanov, Jordan, anonymous visitor</b></font>\n<font color=\"#666666\"><b>Peter Petrov</b> reports:\n<b>ROM</b>\nThere are several rom images of the basic in Pravetz. If you wand disk emulation you need 8DControllerROM and use CALL#320 command.\n<b>RAM</b>\nWith Basic you have 48 K RAM to work, but with this little schematics you can use additional 16K. The signals that you need for proper work are these.\nOne trigger is used to form MAP signal, but second is free to use additional thing. If you realise schematis of disk controller below you can use these schematics together to load 8DDOS v2.10 in additional RAM.\nYou must use write operation in these adresses to use the controller:\n#380 - writing in additional RAM - additional thing is off\n#381 - writing and reading in additional RAM - additional thing is off\n#382 - writing in additional RAM - additional thing is on\n#383 - writing and reading in additional RAM - additional thing is on\nfor \"additional thing\" see Disk controller section\nSo, if you realise this little controller you can use:\nFOR I = #C000 TO #CFFF : POKE I,0 : NEXT - clearing first 4K of additional RAM\nor you can move the basic interpreter in additional memory and use:\nPOKE #381,0\nto go in RAM interpreter and make changes in it.\n<b>DISK CONTROLLER</b>\nIf you have Apple ][ floppy drive and disk controller you can use this schematics to connect them to your Pravetz (Oric). The schematics is from two parts:\nbuffers\ncontroller\nThe signals for proper work of the controller are here:\nYou can change the signal Q with changing the resistors of monovibrator 74LS123.\nThe record of EPROM is here:\nYou must write it from addres #20 of the EPROM.\nConnecting RAM controller and disk controller:\nyou can connect these controllers by this way:\npin 9 of 74LS74 is connecting to A8 addres bar of 2716 EPROM, so the \"additional thing\" is second page of the EPROM, where is the program of loading DOS 8D v.2.1 into additional RAM. (The record of the EPROM above is exatly for first and second page).\n<b>SOFTWARE</b>\nThe versions of the DOS I have are:\nDos 8D v1.0 - you can use it if you realise only the schematics of the disk controller, but this versions loads in normal RAM, so it is unusable with long games.\nDos 8D v.2.1 - you can use it if you realise the two schematics and connect them. So - dos loads in additional RAM and you can use all the programs you have.\nYou can use regular Oric software in Pravetz 8D, but you have not regular letters. You have cyrillic letters instead. Changing of the keyboard maps is with Ctrl-T.\nThere are some games for Pravetz like SnakeByte, Tetris (exellent clone) and other. Most of them are from Bulgarian computer magazine \"Computer for you\". There is 80 column text editor, Disk copier program and the most beautiful - Borislav Zahariev ported BigMac Assembler from Apple ][ to Pravetz, so you can use if you realise schematics above. Soon I hope you will see this software here.\n\t\n</font>", "name": "8D", "manufacturer": "Pravetz", "type": "Home Computer", "origin": "Bulgaria", "year": "1985", "end_of_production": "1989", "built_in_language": "Basic", "keyboard": "Full stroke 57 keys Qwerty + cyrillic", "cpu": "CM630 - Bulgarian copy of the 6502", "speed": "1 mHz", "ram": "48 KB", "rom": "16 KB", "text_modes": "40 columns x 28 lines", "graphic_modes": "240 x 200 (+ 3 text lines)", "colors": "8", "sound": "Programmable Sound Generator AY-3-8912 (from General Instruments)<br>3 voices, 8 octaves + white noise", "size_weight": "35 (W) x 25 (D) cm", "io_ports": "Power supply, Expansion port, Printer/Centronics port, Tape-recorder DIN plug, RGB video out, RF TV out", "power_supply": "Built-in power supply unit", "peripherals": "floppy disk unit, modem, dot matrix printer", "price": "420 levs (Bulgaria, 1985)", "photos": [ { "name": "Pravetz 8D ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_3.jpg", "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>" }, { "name": "close-up ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_2.jpg", "description": "Notice that the keyboard allows to use Latin or Cyrillic alphabet<p class=\"petitgris\">Courtesy <b>http://bulgariancomputers.freeservers.com/mycomputers/</b></p>" }, { "name": "Rear connectors ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_rear.jpg", "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>" }, { "name": "Boot screen ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_boot.jpg", "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>" }, { "name": "Inside ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Inside_1.jpg", "description": "The hardware design was really close to the Atmos one. The same ULA chip (copy?) was used. Contrary to the Atmos, the PSU was located inside the case.<p class=\"petitgris\">Courtesy <b>http://bulgariancomputers.freeservers.com/mycomputers/ </b></p>" }, { "name": "Armenian support lan... ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Armenian_1.jpg", "description": "A tape program allows the use of specific Armenian characters." }, { "name": "Armenian translation ", "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Armenian_2.jpg", "description": "Only for Armenian language specialists......\r\n<p class=\"petitgris\">Thanks to <b>Mattias Persson</b></p>" } ], "links": [ { "url": "http://www.sofiaprint.com/pravetz8d_bul/Pravetz%208D_bul.html", "name": "Pravetz 8D page", "description": "Interesting but in bulgarian..." } ] }
tosec	Pravetz 8D - Games - [DSK]	{ "id": "Pravetz 8D - Games - [DSK]", "name": "Pravetz 8D - Games - [DSK]", "altNames": [ "Pravetz 8D" ] }

oldcomputers

988

{
    "type_id": 1,
    "id": 988,
    "pages": {
        "photos": "photos.asp?t=1&c=988&st=1",
        "links": "links.asp?c=988&st=1",
        "docs": "docs.asp?c=988&st=1",
        "comments": "forum.asp?c=988&st=1"
    },
    "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_1.jpg",
    "company_link": "company.asp?st=1&m=218",
    "company_name": "Pravetz",
    "company_logo": "https://www.old-computers.com/museum/logos/Pravetz_Logo.gif",
    "description": "The Pravetz 8D was a Bulgarian clone of the <a href=\"computer.asp?c=79\">Oric Atmos</a> featuring a Bulgarian version of the 6502 processor called CM630, 16 KB of ROM and 48 KB of RAM\nThe keyboard was almost the same as the original Atmos version, including a MK key, similar to the CTRL key, a C/L key allowing to display Cyrillic or Latin alphabets, and cursor keys. As in <a href=\"computer.asp?c=956\">Pravets 82</a> (etc), the original lowercase characters were replaced by cyrillic characters and the C/L lock key, was the CAPS LOCK key of the Oric Atmos.\nLike the original Atmos, The 8D had two modes of recording : Fast mode at 2400 bits/sec. and slow mode at 300 bits/sec.\nThe computer also featured a parallel Centronics interface and a user port. Pravetz provided a local dot matrix printer called \"Petritch\" but the popular Epson printers could be also connected to the 8D.\nThe \"D\" after Pravets 8 stays for \"???????\" (Domashen = For home use), and the idea was, that it should be used without having to buy any peripherals - monitor (which couldn't be connected through composite video to a Pravets 8D without modification) and FDD (cassete recorder used instead).\nFloppy drives, modem and joysticks were also available. Floppy disk drives  were very hard to find (in fact they appeared only in the early nineteens). They were a modification of the <a href=\"computer.asp?c=956\">Pravetz 82</a> FDDs but with a built-in controller, making them two times bigger. Probably that was one of the reasons why Pravetz 8D never achieved the popularity ot Pravetz 8 (despite of the 3 times lower price).\nThere were in fact two ways to have floppy disk drives for the Pravetz 8D. One was indeed to use Pravetz 82 FDD and to develop an additional controller + power supply (the schematic and firmware were published in \"Computer for you\" magazine). There was an operating system called DOS 8D, developed in Bulgaria by Borislav Zahariev.\nLater, Pravetz factory decided to develop special FDD for the 8D, which was bundled with the controller and the power supply in a box twice bigger than the normal Apple ][ floppy. It came out on market when the production of the computer itself was finished! It used also modified version of DOS 8D for DIY floppy.\nThe computer was very well crafted and the survived systems often look as new.\n___________\n<font color=\"#666666\">Contributed to this page : <b>Bozhidar Stefanov, Jordan,  anonymous visitor</b></font>\n<font color=\"#666666\"><b>Peter Petrov</b> reports:\n<b>ROM</b>\nThere are several rom images of the basic in Pravetz. If you wand disk emulation you need 8DControllerROM and use CALL#320 command.\n<b>RAM</b>\nWith Basic you have 48 K RAM to work, but with this little schematics you can use additional 16K. The signals that you need for proper work are these.\nOne trigger is used to form MAP signal, but second is free to use additional thing. If you realise schematis of disk controller below you can use these schematics together to load 8DDOS v2.10 in additional RAM.\nYou must use write operation in these adresses to use the controller:\n#380 - writing in additional RAM - additional thing is off\n#381 - writing and reading in additional RAM - additional thing is off\n#382 - writing in additional RAM - additional thing is on\n#383 - writing and reading in additional RAM - additional thing is on\nfor \"additional thing\" see Disk controller section\nSo, if you realise this little controller you can use:\nFOR I = #C000 TO #CFFF : POKE I,0 : NEXT - clearing first 4K of additional RAM\nor you can move the basic interpreter in additional memory and use:\nPOKE #381,0\nto go in RAM interpreter and make changes in it.\n<b>DISK CONTROLLER</b>\nIf you have Apple ][ floppy drive and disk controller you can use this schematics to connect them to your Pravetz (Oric). The schematics is from two parts:\nbuffers\ncontroller\nThe signals for proper work of the controller are here:\nYou can change the signal Q with changing the resistors of monovibrator 74LS123.\nThe record of EPROM is here:\nYou must write it from addres #20 of the EPROM.\nConnecting RAM controller and disk controller:\nyou can connect these controllers by this way:\npin 9 of 74LS74 is connecting to A8 addres bar of 2716 EPROM, so the \"additional thing\" is second page of the EPROM, where is the program of loading DOS 8D v.2.1 into additional RAM. (The record of the EPROM above is exatly for first and second page).\n<b>SOFTWARE</b>\nThe versions of the DOS I have are:\nDos 8D v1.0 - you can use it if you realise only the schematics of the disk controller, but this versions loads in normal RAM, so it is unusable with long games.\nDos 8D v.2.1 - you can use it if you realise the two schematics and connect them. So - dos loads in additional RAM  and you can use all the programs you have.\nYou can use regular Oric software in Pravetz 8D, but you have not regular letters. You have cyrillic letters instead. Changing of the keyboard maps is with Ctrl-T.\nThere are some games for Pravetz like SnakeByte, Tetris (exellent clone) and other. Most of them are from Bulgarian computer magazine \"Computer for you\". There is 80 column text editor, Disk copier program and the most beautiful - Borislav Zahariev ported BigMac Assembler from Apple ][ to Pravetz, so you can use if you realise schematics above. Soon I hope you will see this software here.\n\t\n</font>",
    "name": "8D",
    "manufacturer": "Pravetz",
    "type": "Home Computer",
    "origin": "Bulgaria",
    "year": "1985",
    "end_of_production": "1989",
    "built_in_language": "Basic",
    "keyboard": "Full stroke 57 keys Qwerty + cyrillic",
    "cpu": "CM630 - Bulgarian copy of the 6502",
    "speed": "1 mHz",
    "ram": "48 KB",
    "rom": "16 KB",
    "text_modes": "40 columns  x 28 lines",
    "graphic_modes": "240 x 200 (+ 3 text lines)",
    "colors": "8",
    "sound": "Programmable Sound Generator AY-3-8912 (from General Instruments)<br>3 voices, 8 octaves + white noise",
    "size_weight": "35 (W) x 25 (D) cm",
    "io_ports": "Power supply, Expansion port, Printer/Centronics port, Tape-recorder DIN plug, RGB video out, RF TV out",
    "power_supply": "Built-in power supply unit",
    "peripherals": "floppy disk unit, modem, dot matrix printer",
    "price": "420 levs (Bulgaria, 1985)",
    "photos": [
        {
            "name": "Pravetz 8D ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_3.jpg",
            "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>"
        },
        {
            "name": "close-up ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_2.jpg",
            "description": "Notice that the keyboard allows to use Latin or Cyrillic alphabet<p class=\"petitgris\">Courtesy <b>http://bulgariancomputers.freeservers.com/mycomputers/</b></p>"
        },
        {
            "name": "Rear connectors ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_rear.jpg",
            "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>"
        },
        {
            "name": "Boot screen ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_system_boot.jpg",
            "description": "<p class=\"petitgris\">Thanks to joro_dramchev ( Ebay seller) for this picture.</p>"
        },
        {
            "name": "Inside ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Inside_1.jpg",
            "description": "The hardware design was really close to the Atmos one. The same ULA chip (copy?) was used. Contrary to the Atmos, the PSU was located inside the case.<p class=\"petitgris\">Courtesy <b>http://bulgariancomputers.freeservers.com/mycomputers/ </b></p>"
        },
        {
            "name": "Armenian support lan... ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Armenian_1.jpg",
            "description": "A tape program allows the use of specific Armenian characters."
        },
        {
            "name": "Armenian translation ",
            "image": "https://www.old-computers.com/museum/photos/Pravetz_8D_Armenian_2.jpg",
            "description": "Only for Armenian language specialists......\r\n<p class=\"petitgris\">Thanks to <b>Mattias Persson</b></p>"
        }
    ],
    "links": [
        {
            "url": "http://www.sofiaprint.com/pravetz8d_bul/Pravetz%208D_bul.html",
            "name": "Pravetz 8D page",
            "description": "Interesting but in bulgarian..."
        }
    ]
}

tosec

Pravetz 8D - Games - [DSK]

{
    "id": "Pravetz 8D - Games - [DSK]",
    "name": "Pravetz 8D - Games - [DSK]",
    "altNames": [
        "Pravetz 8D"
    ]
}