98412A HP Set

Review HP 9845b/c Computer I/o Rom Set And

The HP 98412A 9845B/C I/O ROM Set, specifically models 09845-65518 and 09845-66519, are essential components for HP 9845 system users looking to upgrade or maintain their systems. These ROM sets are In-System Programmable (ISP) ROMs, which offer the flexibility to load customized firmware, patches, or configurations directly onto the system's read-only memory (ROM).

The HP 98412A 9845B/C I/O ROM Set includes two ROM chips: the 9845B and the 9845C. The 9845B ROM, 09845-65518, handles the system's input functions, while the 9845C ROM, 09845-66519, manages the output functions. Together, these ROMs ensure seamless communication between the system's various peripherals and the main processor.

Each ROM chip is a mask-programmed, 2716 16K x 8 bit static random access memory (SRAM) device. The SRAM technology used in these ROMs allows for easier programming and reprogramming compared to traditional mask-programmed ROMs. This makes the HP 98412A 9845B/C I/O ROM Set an excellent choice for users who require frequent firmware updates or customizations.

The HP 98412A 9845B/C I/O ROM Set is compatible with HP 9845 systems and can be programmed using various programming tools, including the HP I/O Programmer or third-party solutions. The ROMs are packaged in a standard 28-pin DIP (Dual In-line Package) format, ensuring easy installation and replacement.

In summary, the HP 98412A 9845B/C I/O ROM Set, consisting of models 09845-65518 and 09845-66519, is an essential upgrade or maintenance component for HP 9845 system users. These SRAM-based ROMs offer the flexibility to load custom firmware, patches, or configurations, and are compatible with various programming tools. The 28-pin DIP format ensures easy installation and replacement, making this ROM set a valuable addition to any HP 9845 system.

The HP 98412A 9845B/C I/O ROM set 09845-65518 09845-66519 is a collection of read-only memory (ROM) chips used in HP 9845A and 9845B systems. These systems were popular minicomputers used for scientific and engineering applications during the late 1970s and early 1980s. Here are some potential pros and cons of purchasing this ROM set:

1. Authenticity: This ROM set is an original HP product. It may be desirable for collectors, historians, or those restoring vintage systems.

2. Functionality: Installing this ROM set in your HP 9845 system may restore lost functionality or fix issues that arise due to ROM degradation or corruption.

3. Compatibility: This ROM set is designed specifically for the HP 9845A and 9845B systems, ensuring compatibility.

4. Technical challenge: Installing ROM chips can be a rewarding experience for those interested in hardware and vintage computing.

1. Cost: The ROM set may be expensive due to its rarity and the fact that it is no longer in production.

2. Complexity: Installing ROM chips requires some technical expertise and the appropriate tools.

3. Risk: There is a risk of damaging the system or the ROM chips during installation.

4. Obsolete technology: The HP 9845 systems and their associated ROM sets are no longer in production or widespread use.

Purchasing the HP 98412A 9845B/C I/O ROM set 09845-65518 09845-66519 can be a worthwhile investment for those restoring or maintaining HP 9845 systems. However, it requires a significant amount of technical expertise, and the cost may be prohibitive for some. Ultimately, the decision to purchase this ROM set depends on individual circumstances, interest in vintage computing, and the availability of alternative solutions.

If you are considering purchasing the HP 98412A 9845B/C I/O ROM set 09845-65518 09845-66519, ensure that you have the necessary technical expertise, tools, and resources to install the ROMs safely and correctly. Additionally, consider exploring alternative solutions, such as emulators or other ROM sets, which may be more accessible and cost-effective.

Details:

Not from this unit. Hp 9845B/c computer i/o rom set 98412A 09845-65518 and 09845-66519, note: second picture is representative of the innards. Some have multiple die installed. A ceramic substrate has gold traces and the die attached wires bonded.

specifications vintcalc:

• brand: Hp
• mpn: 98412a
• country of origin: United States
• vintage: Yes

general vintcalc:

• category: Electronics > Vintage Calculators

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• type: fixed
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• carrier: usps

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• rating: 100.0%
• # reviews: 56
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offer vintcalc:

• price: $100.00
• item condition: Used
• options: ship-to-home
• in stock #: 1
• availability: in stock
• sold #: 6
• started: april 23, 2026