{"id":704,"date":"2013-09-17T17:05:05","date_gmt":"2013-09-17T17:05:05","guid":{"rendered":"http:\/\/www.antiquetech.com\/?page_id=704"},"modified":"2013-09-17T17:06:31","modified_gmt":"2013-09-17T17:06:31","slug":"rca-cosmac-1804","status":"publish","type":"page","link":"http:\/\/www.antiquetech.com\/?page_id=704","title":{"rendered":"RCA COSMAC 1804"},"content":{"rendered":"

General<\/h2>\n\n\n\n\n\n
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General Information<\/b><\/p>\n<\/td>\n

\u00a0The COSMAC<\/a> 1804 was RCA’s first single chip microcomputer. The 1804 was an 1802 with on chip 2KB of mask programmable ROM and 32 bytes of RAM added. It is almost pin compatible with the 1802 except pin 16 differs on the 1802 it is Vcc and on the 1804 it is EMS. The 1804 is software compatible with the 1802 and added 22 instructions.<\/span><\/td>\n<\/tr>\n
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Production<\/b><\/p>\n<\/td>\n

1976<\/span><\/td>\n<\/tr>\n
Designers<\/b><\/span><\/td>\nLead Designer: Joe Weisbecker, Team Lead: Jerry Herzog<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Architecture<\/h2>\n\n\n\n\n
Type<\/span><\/td>\nData Word<\/span><\/td>\nAddress Space<\/span><\/td>\nMax Clock<\/span><\/td>\nInstruct- ions<\/span><\/td>\nAssists<\/span><\/td>\nReg’s\u00a0 GP<\/span><\/td>\nReg’s Math<\/span><\/td>\nReg’s Index<\/span><\/td>\nIO Ports\u00a0\u00a0<\/span><\/td>\nStack<\/span><\/td>\nInterrupts<\/span><\/td>\nMemory<\/span><\/td>\n<\/tr>\n
MCU<\/a>,\u00a0 CMOS<\/a><\/span><\/td>\n8-bit<\/span><\/td>\n64K<\/span><\/td>\n4Mhz and 8Mhz<\/span><\/td>\n113<\/span><\/td>\nNA<\/span><\/td>\n16×16-bit or 32×8-bit<\/span><\/td>\n1<\/span><\/td>\nNA<\/span><\/td>\n8<\/span><\/td>\nExt RAM<\/span><\/td>\n1 Level<\/span><\/td>\n2KB ROM, 64B RAM<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Packages<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
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Chip Name<\/b><\/span><\/p>\n<\/td>\n

\n

Package<\/b><\/p>\n<\/td>\n

\n

On-Chip Identification<\/b><\/span><\/p>\n<\/td>\n

\n

Picture<\/b><\/span><\/p>\n<\/td>\n

\n

General Comments<\/b><\/p>\n<\/td>\n<\/tr>\n

CDP1804D<\/span><\/td>\nwhite ceramic, silver lid, 40 gold side braised pins<\/span><\/td>\nCDP1804D<\/span><\/td>\n<\/td>\nStandard operating range: 4V to10.5V. The ceramic “D” versions have an operating temperature range of -55o<\/sup> to 120o<\/sup>C<\/span><\/td>\n<\/tr>\n
CDP1804CD<\/span><\/td>\ngray ceramic, silver lid, 40 gold side braised pins<\/span><\/td>\nCDP1804CD<\/span><\/td>\n<\/td>\n“C” suffix versions have a lower voltage range: 4V to 6.5V. Max clock is limited to 4Mhz.<\/span><\/td>\n<\/tr>\n
CDP1804AD<\/span><\/td>\nwhite ceramic, silver lid, 40 gold side braised pins<\/span><\/td>\nCDP1804AD<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
CDP1804ACD<\/span><\/td>\nwhite ceramic, silver lid, 40 gold side braised pins<\/span><\/td>\nCDP1804ACD<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
CDP1804E<\/span><\/td>\nblack plastic, 40 tin leads<\/span><\/td>\nCDP1804E<\/span><\/td>\n<\/td>\nThe plastic “E” versions have an operating temperature range of -40o<\/sup> to 85o<\/sup>C,\u00a0<\/span><\/td>\n<\/tr>\n
CDP1804CE<\/span><\/td>\nblack plastic, 40 tin leads<\/span><\/td>\nCDP1804CE<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
CDP1804AE<\/span><\/td>\nblack plastic, 40 tin leads<\/span><\/td>\nCDP1804AE<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
CDP1804ACE<\/span><\/td>\nblack plastic, 40 tin leads<\/span><\/td>\nCDP1804ACE<\/span><\/td>\n<\/td>\n<\/td>\n<\/tr>\n
CDP1804PCE<\/span><\/td>\n<\/td>\n<\/td>\n<\/td>\nI have found little information about this chip. It appears to be a microprocessor version of the 1804 with no RAM or ROM<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Related Chips<\/h2>\n\n\n\n\n\n
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Related Chips<\/b><\/p>\n<\/td>\n

\n

RCA 1801<\/a>, RCA 1802<\/a>, RCA 1805<\/a>, RCA 1806<\/a><\/p>\n<\/td>\n<\/tr>\n

\n

Second Sources<\/b><\/span><\/p>\n<\/td>\n

\n

None<\/span><\/p>\n<\/td>\n<\/tr>\n

Support Chips<\/b><\/span><\/td>\n1852<\/b> (8-bit I\/O Port), 1854<\/b> (UART), 1856<\/b> (4-bit memory buffer), 1857<\/b> (4-bit I\/O buffer)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

General General Information \u00a0The COSMAC 1804 was RCA’s first single chip microcomputer. The 1804 was an 1802 with on chip 2KB of mask programmable ROM and 32 bytes of RAM added. It is almost pin compatible with the 1802 except pin 16 differs on the 1802 it is Vcc and on the 1804 it is … <\/p>\n

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