The IBM PC jr

Article Abstract:

The IBM PC jr's main design consideration is compatibility with the IBM Personal Computer for an affordable price. The system uses an 8088 processor running at 4.77 MHZ. The color graphics circuitry is on the system board and the video logic is composed mainly of the 6845 CRT controller and the Video Gate Array (VGA). On-board ROM contains the BIOS, Cassette Basic, and other diagnostic programs. Two ROM cartridge slots can contain up to 128K bytes of ROM. An 80C48 CMOS microprocessor controls the cordless infrared keyboard. The operating system is the IBM PC-DOS 2.1 system. Incompatibilities between the IBM PC and PC jr include the processing speed, the BIOS, some components, direct memory access (DMA), the display area, display paging, and the keyboard. Diagrams illustrate the PC jr system architecture, memory timing, display memory paging, and the sound system. Tables list the display modes and keystroke mapping between the PC and PC jr.

Evaluation, Product/Service Evaluation, Architecture, Keyboards (Computers), Compatibility (Computers), Compatibility, Compatible Hardware, Personal Computers, Microcomputer, Keyboard, 8-Bit, Home Computers, MS-DOS, Direct Memory Access, IBM PC jr

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A-la carte or smorgasbord? Multiproduct clubs with costly exclusion

Article Abstract:

Two multiproduct clubs with costly exclusion were analyzed. Under a la carte exclusion, where non-authorized users can be excluded from usage of each facility, the multiproduct club can charge a price for usage of each facility and control the usage level of each facility. Under smorgasbord exclusion, where non-authorized users can be excluded from usage of the multiproduct club in totality but not individually from usage of each facility, the multiproduct club can only set an admittance price which allows buyers to employ all facilities. Varying pricing rules for similar club services generate an interclub externality. Users of smorgasbord multiproduct clubs may take advantage of these clubs' freely accessible facilities at levels exceeding the socially optimal ones to avoid having to pay for usage at clubs that offer similar services at individual prices. Inefficiency vanishes through government intervention.

Analysis, Product management

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Community lost?

Article Abstract:

A study was conducted to examine the hypothesis that the market possesses no capability to sustain lasting commitments in the family and in the neighborhood. The markets in three historical periods presented in three books, namely, 'The Lost City,' 'Democracy's Discontent' and 'The Costs of Living,' are examined. Results indicate that communitarian values can survive in a market society, that the market juggernaut can be stopped, that cultural forces influence the market and that the communitarian account of social relationships in the marketplace is erroneous.

Social aspects, Economic aspects, Markets (Economics), Social values

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