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Apple II system clocks, also know as Real-time Clock s, were commodities in the early days of computing. A clock/calandar did not become standard in the Apple II line of computers until 1987 with the introduction of the Apple IIGS . Although many productivity programs as well as the ProDOS operating system implemented time/date functions, users would have to manually enter this information everytime they turned the computer on. Power users often had their Apple II's Peripheral Slots completely filled with expansion cards, so third party vendors came up with some unique solutions in order to mitigate this problem with products like the Serial Pro and No-Slot Clock. No-Slot Clock – ''Dallas Semiconductor'' The No-Slot Clock, also known as the '''Dallas Smartwatch (DS1216)''', is a 28-pin Chip -like device that can be used directly in any Apple II or Apple II compatible with a 28-pin ROM . Dallas Semiconductor produces the device as an easy implementation for a Real-time Clock for a variety of applications. The clock is powered by an embedded Rechargeable Lithium Battery , electrically disconnected until power is first applied to retain freshness. The battery has a life expectancy of 10 years, is not replaceable, and is capable of powering the clock for several thousand hours between charges. In an Apple II, the No-Slot Clock resides under a 28-pin ROM chip. A user must remove the ROM, insert the No-Slot Clock, and then reinsert the ROM chip into the top of the No-Slot Clock. The No-Slot Clock is both ProDOS and Dos 3.3 compatible however a Software Driver must be patched into ProDOS or integrated into the applicable Dos 3.3 program. Once the driver is installed it emulates the Thunderclock. The No-Slot Clock is installed in the following locations on the motherboard in the following computers: apple2.org: Apple Reference Web
GSE-Reactive offers the No-Slot Clock in its online store, with no minimum quantity. Serial Pro – ''Applied Engineering'' The Serial Pro was a multifunction serial interface and clock/calendar card from Applied Engineering . By combining the functions of two cards into one, the Serial Pro freed up an extra slot for those with highly-populated machines. This card was unique in the sense that it did not use "Phantom Slots" to achieve this functionality. Previous multifunction cards required that a secondary function be "mapped" to a different slot in the computer's memory, rendering that slot unusable. The card was capable of a 12/24 hour clock format, was both ProDOS and DOS 3.3 compatible, and had on-screen time and date setting built into its ROM, eliminating the need to run a program in order to set the time. The battery was a GE DataSentry rechargable Ni-cad battery which had a lifespan rating of 20 years. The card retailed for $139 during the late 1980's.Applied Engineering Spring/Summer '88 Catalog ''For more on the Serial Pro's communication capabilities, see its entry in Apple II Serial Cards .'' Thunderclock Plus – ''Thunderware Incorporated'' When the Thunderware Thunderclock Plus was released in 1980, it quickly became the defacto standard for an Apple II system clock. When Apple Computer released its new ProDOS operating system in 1984, a Thunderclock software driver came built-in. From that point on, all new Apple II system clocks strived to emulate the Thunderclock. The card itself was more compact than the earlier "The Clock" from Mountain Computers and countained two battery holders for off the shelf Alkaline Batteries which were easily replacable. Time Master H.O. – ''Applied Engineering'' The Time Master H.O. clock card from Applied Engineering was possibly the most advanced system clock ever designed for any Apple II. The card utilized an onboard Z80 CPU and was capable of emulating all other system clocks which preceded it. The Timemaster H.O. was powered by a GE Datasentry rechargable Ni-cad battery which had a lifespan rating of 20 years. It was capable of 24 hour military format or more commonly, 12 hour with AM/PM format, millisecond timekeeping with an accuracy of 0.00005%, and an onboard timer which could time down any interval up to 48 days. It also maintained an internal calendar, separate of the 7 year cycle wich ProDOS mapped. Coincidentally the Timemaster H.O. was 100% ProDOS and DOS 3.3 compatible. The "H.O." in Timemaster H.O. stood for "High Output". This referred to the 8-pin Digital I/O port on the card for advanced applications. Through this port, one could hook up Applied Engineering's BSR X-10 interface and "command console" to remotely control lights and electrical appliances. The BSR system could send signals over existing 120 volt wiring, eliminating the need for additional wires. The system could also be used for low voltage implementaions. The Timemaster H.O. retailed for $99 during the late 1980's while the BSR option cost an additional $29. The command console cost $39. Applied Engineering Spring/Summer '88 Catalog Other System Clocks
REFERENCES SEE ALSO Apple II Peripheral Cards |
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