yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
161 lines
6.6 KiB
Markdown
161 lines
6.6 KiB
Markdown
---
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title: Unitron (Brazil) Mac 512
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categories:
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- Computers
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types:
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- Professional Computer
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origins:
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- Brazil
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years:
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- '1985'
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cpus:
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- Motorola 68000
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params:
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name: Mac 512
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image: /media/museum/photos/unitron_mac512_system_s1.jpg
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company: /companies/unitron-brazil
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company_name: Unitron (Brazil)
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specs:
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- label: NAME
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value: Mac 512
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- label: MANUFACTURER
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value: Unitron (Brazil)
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- label: TYPE
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value: Professional Computer
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- label: ORIGIN
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value: Brazil
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- label: YEAR
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value: '1985'
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- label: BUILT IN LANGUAGE
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value: None
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- label: KEYBOARD
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value: Full stroke qwerty 58 keys
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- label: CPU
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value: Motorola 68000
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- label: SPEED
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value: Unknown
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- label: RAM
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value: 512 KB
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- label: ROM
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value: 64 KB
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- label: TEXT MODES
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value: 40 chars x 32 lines bit-mapped
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- label: GRAPHIC MODES
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value: 512 x 342 dots
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- label: COLORS
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value: Monochrome
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- label: SOUND
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value: Unknown
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- label: SIZE / WEIGHT
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value: Probably same as the original Mac 512
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- label: BUILT IN MEDIA
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value: 3.5'' floppy disk drive
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- label: OS
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value: A thing called ''System'' (actually it was a MacOS version translated and adpted by Unitron).
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- label: POWER SUPPLY
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value: Built-in power supply unit
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- label: PRICE
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value: Unknown
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tabs:
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- photos
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- links
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forum_thread: 971
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photos:
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- title: UNITRON MAC 512
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subtitle: ''
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text: Thanks to **www.cobit.cjb.net**
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image: /media/museum/photos/unitron_mac512_system_s3.jpg
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- title: 'BLACK KEYBOARD #1'
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subtitle: ''
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text: |-
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With auto-eject drive
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Thanks to **www.cobit.cjb.net**
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image: /media/museum/photos/unitron_mac512_system_s4.jpg
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- title: 'BLACK KEYBOARD #2'
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subtitle: ''
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text: Thanks to **www.cobit.cjb.net**
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image: /media/museum/photos/unitron_mac512_system_s2.jpg
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- title: APPLE & UNITRON
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subtitle: ''
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text: |-
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Side by side, the original Apple Macintosh, and the Unitron copy.\
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The original Apple keyboard is here replaced with a large PC-AT-like keyboard from DataDesk International, compatible with the original (128K to Plus) Mac
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Thanks to **Jecel Assumpcao Jr**
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image: /media/museum/photos/unitron_mac512_withapplemac.jpg
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- title: DUAL FDD VERSION
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subtitle: ''
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text: |-
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There could have been a small Unitron production of this dual FDD version.\
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The patch was really ugly (see 'Unitron label' picture)
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image: /media/museum/photos/unitron_mac512_dualfdd_s1.jpg
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- title: UNITRON LABEL
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subtitle: ''
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text: |-
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Notice also the ugly patch of this dual FDD version. A cable is attached to the regular external floppy connector and then doubles back going in through a crack in the case to the floppy near the front.
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Thanks to **Jecel Assumpcao Jr** for information and picture.
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image: /media/museum/photos/unitron_mac512_label_s2.jpg
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- title: INSIDE
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subtitle: ''
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text: Thanks to **Jecel Assumpcao Jr**
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image: /media/museum/photos/unitron_mac512_inside_s1.jpg
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- title: 'INSIDE #2'
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subtitle: ''
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text: |-
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One can see the solder side of the video and power supply card.
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Thanks to **Jecel Assumpcao Jr**
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image: /media/museum/photos/unitron_mac512_opened_s1.jpg
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- title: MAINBOARD
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subtitle: ''
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text: |-
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The missing chip, close to the 68000 processor, was for the SCSI interface. So, this version wasn't a pure Mac512 clone.
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The small board sitting on center holds the real time clock chip made for Unitron by National. This ended up having a few bugs so the designers needed to add some TTL chips to work around them. This was done by creating a small board with the chip and fixes that would fit into the socket for the chip.
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It is interesting to note how \*everything\* is socketed in contrast to production Macs where practically nothing was.\
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Another interesting detail are several small light grey boards - these fit into board positions designed for resistor networks. These probably proved hard to buy for the initial production run and were replaced with these boards built using descrete resistors.
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Thanks to **Jecel Assumpcao Jr**
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image: /media/museum/photos/unitron_mac512_mainboard_s2.jpg
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- title: USER'S MANUAL
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subtitle: ''
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text: Thanks to **Jecel Assumpcao Jr**
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image: /media/museum/photos/unitron_mac512_manual_s1.jpg
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links:
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- title: Detailed information about the Unitron Mac story. (.pdf file)
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url: http://imv.au.dk/sts/arbejdspapirer/WP1_web.pdf
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text: .pdf file
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- title: Very interesting Unitron 'Turbo' Mac page
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url: http://www.lsi.usp.br/~jecel/mac512.html
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text: By Jecel Assumpção Jr, designer of the Turbo version.
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oc_id: 997
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source:
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url: https://web.archive.org/web/20230607233623/http://www.old-computers.com/museum/computer.asp?c=997
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date: '2023-06-07'
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---
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This machine was the **first Macintosh clone** in the whole world.
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In Brazil it is almost unknown and there are people who doubt its existence, but it really did exist!\
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This computer almost started a commercial war between Brazil and the United States. Apple persuaded the U.S. government to use everything it could against the Brazilian clone makers (increases in import taxes for brazilian products such as orange juice, shoes, etc.) until this machine was no longer made.
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Brazil had a tradition since the beginning of the 80's of cloning computers without permission from the original brand owners (see the lawsuit moved by Sinclair against Microdigital). Apple had so far tolerated brazilian clones of the Apple II, but not this time...
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There were differences between this machine and genuine Macs: Some of Unitron's macs had keyboards with black keys, some others had grey keys. Some versions had a disc drive with a button to eject the disc, others were like the original Mac and had no button in its disc drive.
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The end of making Brazilian Mac clones may have been not good for Apple in the long run since it opened the doors of Brazilian market to PC clones that didn't have such restrictions.
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Thanks to **Ernesto Hublard** from Brazil for information.
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---
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**Jonas Pachciarek Roter** adds:\
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I would say that Apple's decision to sue Unitron was a huge mistake. Not that they shouldn't do something but how it was done.\
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This decision made them stay out of our market for more than ten years. Currently Apple's local market share is still very small.\
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IBM's decision to tolerate clones made them stronger and is most probably the reason why 99% of the market uses IBM XT descendents.
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<table> <tr> <td></td> <td>We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.</td> <td></td> </tr> </table>
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