Intel 1103

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Intel 1103
Intel C1103.jpg
A ceramic C1103 variant.
Media type 10 μm p-MOS DRAM
Capacity 1 Kilobit
Standard 18-pin DIP
Developed by Intel
Usage HP 9800 series,[1] PDP-11[2] and others

The 1103 is a dynamic random-access memory (DRAM) integrated circuit (IC) developed and fabricated by Intel. Introduced in October 1970, the 1103 was the first commercially available DRAM IC; and due to its small physical size and low price relative to magnetic-core memory, it replaced the latter in many applications.[3][4] While it was introduced in 1970, initial production yields were poor, and it was not until the fifth stepping of the production masks that it became available in large quantities during 1971.


In 1969 William Regitz and his colleagues at Honeywell invented a three-transistor dynamic memory cell and began to canvass the semiconductor industry for a producer. The recently founded Intel Corporation responded and developed two very similar 1024-bit chips, the 1102 and 1103, under the lead of Joel Karp, working closely with William Regitz.[5] Ultimately only the 1103 went into production.

Technical Details[edit]

DRAM memory cell of Intel i1103 chip.
tRWC 580 ns Random read or write cycle time (from one +ve Precharge edge to the next)
tPO 300 ns Access time: Precharge High to valid data out
tREF 2 ms Refresh time
VCC 16 V Supply voltage
p-MOS 10 µm Production process (silicon gate MOSFET)
Capacity 1024x1 Capacity x bus width


  1. ^ TimeToast Evolution of Educational Technology
  2. ^ EK-11045-MM-007.pdf
  3. ^ Jacob, Bruce et al. (2008). Memory Systems: Cache, DRAM, Disk. Morgan Kaufmann Publishers. pp. 457–458.
  4. ^ Mary Bellis, The Invention of the Intel 1103
  5. ^ Computer History Museum: "Oral History of Joel Karp" Interviewed by Gardner Hendrie March 3, 2003 | Atherton, California