Microvision

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Microvision
Milton Bradley Microvision Logo.png
Milton-Bradley-Microvision-Handheld-FL.jpg
A Microvision with Block Buster cartridge inserted
Also known asMilton Bradley Microvision
MB Microvision
Manufacturer Milton Bradley Company
Type Handheld game console
Generation Second generation
Release dateNovember 1979;44 years ago (1979-11)
Introductory priceUS$49.99(equivalent to about $210 in 2023)
Discontinued1981
Media ROM cartridges
CPU Intel 8021/TI TMS1100 (on cartridge) clocked at 100 kHz
Memory64 bytes RAM, 2K ROM
Display16 × 16 pixels resolution
Power1 × 9V battery (TMS1100 processors), 2 × 9V battery (Intel 8021 processors)

The Microvision (aka Milton Bradley Microvision or MB Microvision) is the first handheld game console that used interchangeable cartridges [1] [2] and in that sense is reprogrammable. [3] It was released by the Milton Bradley Company in November 1979 [4] for a retail price of $49.99, [5] [6] equivalent to $212.00 in 2023.

Contents

The Microvision was designed by Jay Smith, the engineer who would later design the Vectrex video game console. [2] The Microvision's combination of portability and a cartridge-based system led to moderate success, with Smith Engineering grossing $15 million in the first year of the system's release. However, very few cartridges, a small screen, and a lack of support from established home video game companies led to its demise in 1981. [7] According to Satoru Okada, the former head of Nintendo's R&D1 Department, the Microvision gave birth to Game Boy, the follow-up to Game & Watch, after Nintendo designed around Microvision's limitations. [8]

Production

Screenshot of Block Buster, which came packaged with the Microvision Microvision - Block Buster (1979) - Gameplay screenshot.svg
Screenshot of Block Buster, which came packaged with the Microvision

Unlike most later consoles, the Microvision did not contain an onboard processor (CPU). Instead, each game included its own processor contained within the removable cartridge. [9] [10] [11] This meant that the console itself effectively consisted of the controls, LCD panel and LCD controller. [9] [11]

The processors for the first Microvision cartridges were made with both Intel 8021 (cross licensed by Signetics) and Texas Instruments TMS1100 processors. Due to purchasing issues, Milton Bradley switched to using TMS1100 processors exclusively including reprogramming the games that were originally programmed for the 8021 processor. The TMS1100 was a more primitive device, but offered more memory and lower power consumption than the 8021. First-revision Microvisions needed two batteries due to the 8021's higher power consumption, but later units (designed for the TMS1100) only had one active battery holder. Even though the battery compartment was designed to allow the two 9-volt batteries to be inserted with proper polarity of positive and negative terminals, when a battery was forcefully improperly oriented, while the other battery was properly oriented, the two batteries would be shorted and they would overheat. The solution was to remove terminals for one of the batteries to prevent this hazard. Due to the high cost of changing production molds, Milton Bradley did not eliminate the second battery compartment, but instead removed its terminals and called it a spare battery holder.[ citation needed ]

Problems

The uncovered LCD screen of a Microvision, showing screen damage Milton-Bradley-Microvision-Casing-Open-02.jpg
The uncovered LCD screen of a Microvision, showing screen damage

Microvision units and cartridges are now somewhat rare. [12] [13] Those that are still in existence are susceptible to three main problems: "screen rot," ESD damage, and keypad destruction.

Screen rot

The manufacturing process used to create the Microvision's LCD was primitive by modern standards. Poor sealing and impurities introduced during manufacture have resulted in the condition known as screen rot. The liquid crystal spontaneously leaks and permanently darkens, resulting in a game unit that still plays but is unable to properly draw the screen. While extreme heat (such as resulting from leaving the unit in the sun), which can instantly destroy the screen, can be avoided, there is nothing that can be done to prevent screen rot in most Microvision systems. [3]

ESD damage

A major design problem on early units involves the fact that the microprocessor (which is inside the top of each cartridge) lacks ESD protection and is directly connected to the copper pins which normally connect the cartridge to the Microvision unit. If the user opens the protective sliding door that covers the pins, the processor can be exposed to any electric charge the user has built up. If the user has built up a substantial charge, the discharge can jump around the door's edge or pass through the door itself (dielectric breakdown). The low-voltage integrated circuit inside the cartridge is extremely ESD sensitive, and can be destroyed by an event of only a few dozen volts which cannot even be felt by the person, delivering a fatal shock to the game unit. This phenomenon was described in detail by John Elder Robison (a former Milton Bradley engineer) in his book Look Me in the Eye ; Robinson described the issue as having been a significant enough issue during the 1979 holiday season (with up to 60% of units being returned as defective) that it resulted in significant panic among Milton Bradley staff and required extensive modifications to both later Microvision units and Microvision factories (the former being of his own design) to better dispel stray static charges. [14]

Keypad destruction

The Microvision unit had a twelve-button keypad, with the switches buried under a thick layer of flexible plastic. To align the user's fingers with the hidden buttons, the cartridges had cutouts in their bottom (over the keypad). As different games required different button functions, the cutouts were covered with a thin printed piece of plastic, which identified the buttons' functions in that game. The problem with this design is that pressing on the buttons stretched the printed plastic, resulting in the thin material stretching and eventually tearing. Having long fingernails exacerbated the condition. Many of the initial games were programmed to give feedback of the keypress when the key was released instead of when the key was pressed. As a result, users may press on the keypad harder because they are not being provided with any feedback that the key has been pressed. This resulted from a keypad used for prototyping being different from the production keypad; the prototyping keypad had tactile feedback upon key pressing that the production units lacked.[ citation needed ]

Technical specifications

The PCB of a Sea Duel game cartridge, showing the TI3496 processor from the TMS1100 family Milton-Bradley-Microvision-Cartridge-Motherboard.jpg
The PCB of a Sea Duel game cartridge, showing the TI3496 processor from the TMS1100 family

Games

While the game cartridge plastic cases were beige colored in the USA, in Europe they came in a variety of different colors, and the games were numbered on the Box. The age range in Europe for the console and its games was from 8 to 80 years old or 8 to Adult.

There were 12 titles known to have been released.

  Background shading indicates canceled games.
#US titleOverseas titlesGame number (EU)Release dateMicroprocessor/s [15] PCB Revision(s)
1 Flag of the United States.svg Block Buster

4952

Flag of the United Kingdom.svg Block Buster
Flag of Germany.svg Block Buster
Flag of the Netherlands.svg Block Buster
Flag of Italy.svg Block Buster
Flag of France.svg Casse Brique
Flag of the United Kingdom.svg 1
Flag of Germany.svg 1
Flag of the Netherlands.svg 1
Flag of Italy.svg 1
Flag of France.svg 1
November 1979TI MP3450A4952 REV A

4952-56 REV A

4952-79 REV B

2 Flag of the United States.svg Bowling

4972

Flag of the United Kingdom.svg Bowling
Flag of Germany.svg Bowling
Flag of the Netherlands.svg Bowling
Flag of Italy.svg Bowling
Flag of France.svg Bowling
Flag of the United Kingdom.svg 2
Flag of Germany.svg 2
Flag of the Netherlands.svg 2
Flag of Italy.svg 2
Flag of France.svg 2
November 1979TI MP3475NLL4952 REV A
3 Flag of the United States.svg Connect Four

4971

Flag of the United Kingdom.svg Connect 4
Flag of Germany.svg 4 Gewinnt
Flag of the Netherlands.svg Vier Op'n Rij
Flag of Italy.svg Forza 4
Flag of France.svg Puissance 4
Flag of the United Kingdom.svg 5
Flag of Germany.svg 5
Flag of the Netherlands.svg 5
Flag of Italy.svg 5
Flag of France.svg 5
November 1979Signetics Intel 8021

TI MP3481NLL

4971 REV C

4952 REV -

4 Flag of the United States.svg Pinball

4974

Flag of the United Kingdom.svg Pinball
Flag of Germany.svg Pinball
Flag of the Netherlands.svg Flipper
Flag of Italy.svg Flipper
Flag of France.svg Flipper
Flag of the United Kingdom.svg 4
Flag of Germany.svg 4
Flag of the Netherlands.svg 4
Flag of Italy.svg 4
Flag of France.svg 4
November 1979TI MP3455NLL4952 REV A
5 Flag of the United States.svg Mindbuster

4976

N/AN/A1979TI MP3457NLL4952 REV A
6 Flag of the United States.svg Star Trek: Phaser Strike
(later just Phaser Strike)

4973

Flag of the United Kingdom.svg Shooting Star
Flag of Germany.svg Shooting Star
Flag of the Netherlands.svg Shooting Star
Flag of Italy.svg Shooting Star
Flag of France.svg Shooting Star
Flag of the United Kingdom.svg 3
Flag of Germany.svg 3
Flag of the Netherlands.svg 3
Flag of Italy.svg 3
Flag of France.svg 3
1979TI MP3454NLL4952 REV A
7 Flag of the United States.svg Vegas Slots

4975

N/AN/A1979TI MP3474-NLL4952-56 REV -
8 Flag of the United States.svg Baseball

4974

N/AN/A1980TI MP3479-N1NLL4952-56 REV -
9 Flag of the United States.svg Sea Duel

4064

Flag of the United Kingdom.svg Sea Duel
Flag of Germany.svg See-Duell
Flag of the Netherlands.svg Duel
Flag of Italy.svg Duello Sul Mare
Flag of France.svg Bataille Navale (Battleship)
Flag of the United Kingdom.svg 6
Flag of Germany.svg 6
Flag of the Netherlands.svg 6
Flag of Italy.svg 6
Flag of France.svg 6
1980TI MP3496-N14952-56 REV -
10 Flag of the United States.svg Alien Raiders

4176

Flag of the United Kingdom.svg Space Blitz
Flag of Germany.svg Blitz
Flag of the Netherlands.svg Blitz
Flag of Italy.svg Blitz
Flag of France.svg Blitz
Flag of the United Kingdom.svg 7
Flag of Germany.svg 7
Flag of the Netherlands.svg 7
Flag of Italy.svg 7
Flag of France.svg 7
1981TI M34009-N14952-79 REV B
11 Flag of the United States.svg Cosmic Hunter

4177

N/AN/A1981TI M34007-N14952-79 REV B
12N/A Flag of the United Kingdom.svg Super Block Buster
Flag of Germany.svg Super Blockbuster 611497800
Flag of Italy.svg Super Block Buster
Flag of France.svg Super Casse Brique (Super Brick Breaker) 611497801
Flag of the United Kingdom.svg 8
Flag of Germany.svg 8
Flag of Italy.svg 8
Flag of France.svg 8
1982TI M34047-N2LL7924952D02 Rev B
13Barrage??Unreleased
(supposed to be released in 1982)
?

The Microvision was featured in Friday the 13th Part 2 (1981). [5]

Reviews

See also

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References

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  9. 1 2 "Milton Bradley Microvision (U.S.)". Handheld Museum. Archived from the original on 2018-08-21. Retrieved 2018-12-02. the console itself is nothing more than controls, LCD panel and a controller chip for the LCD panel. Each cartridge contains the microprocessor, which happens to have a small amount of ROM space on it that MB loaded the game code onto.
  10. "MB Microvision Handheld Games Console". Simply Eighties. Archived from the original on 2017-07-10. Retrieved 2018-12-02. In fact, it was the cartridge itself that contained the CPU, and just to confuse everyone two different ones were used.
  11. 1 2 "Milton Bradley Microvison (1979 – 1981)". Museum of Obsolete Media. 27 September 2013. Archived from the original on 2018-11-21. Retrieved 2018-12-07. The main unit was little more than a housing for the display, batteries, switches and controller, while the brains of each game was a combined microprocessor/memory chip inside the clip-on cartridge.
  12. Brown, Jason (2022-01-14). "12 Best Microvision Games Of 2022". RetroDodo. Retrieved 2022-02-13.
  13. Lester, John "Gamester81" (2013-04-28). "History of Consoles-Microvision (1979)". Gamester81.com. Retrieved 2022-02-13.{{cite web}}: CS1 maint: numeric names: authors list (link)
  14. Robinson, John Elder (25 September 2007). "Chapter 21: Being Young Executives". Look Me in the Eye. Three Rivers Press. pp.  197-203. ISBN   978-0-307-39598-6.
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