Browse Prior Art Database

Programmable EPROM Card

IP.com Disclosure Number: IPCOM000040429D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Frey, DE: AUTHOR [+3]

Abstract

Many microprocessor-based systems use Erasable Programmable Read-Only Memory (EPROM) modules for software storage. The majority of these designs require EPROMs to be programmed prior to card assemly and then placed in sockets on the assembled card. A disadvantage occurs when the software in the EPROMs require an update, since EPROM modules must be extracted from the card, reprogrammed, labeled, and then placed back onto the card. The Programmable EPROM card eliminates the sockets by implementing a card that can be programmed directly from the card input/output pins (I/O) after card assembly. This card also reduces the card I/O requirement by eliminating direct connections from the EPROM module to the card I/O that previous designs required.

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Programmable EPROM Card

Many microprocessor-based systems use Erasable Programmable Read-Only Memory (EPROM) modules for software storage. The majority of these designs require EPROMs to be programmed prior to card assemly and then placed in sockets on the assembled card. A disadvantage occurs when the software in the EPROMs require an update, since EPROM modules must be extracted from the card, reprogrammed, labeled, and then placed back onto the card. The Programmable EPROM card eliminates the sockets by implementing a card that can be programmed directly from the card input/output pins (I/O) after card assembly. This card also reduces the card I/O requirement by eliminating direct connections from the EPROM module to the card I/O that previous designs required. The technique for programming this card employs a commercially available EPROM card programmer that uses established programming algorithms. One example of a circuit arrangement for programming card-installed EPROM modules is shown in the figure. To provide the programming capability, control lines 1-5 and programming voltage 6 are required, but data bus 7, shown in phantom, with direct connections to EPROMs 8, is not required. Programming is accomplished through Data I/O bus 9.

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