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43 lines
1.7 KiB
Plaintext
43 lines
1.7 KiB
Plaintext
=============================================================================
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AST RESEARCH, INC. TECHNICAL BULLETIN #0610 02-07-90
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=============================================================================
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SERIAL PORT PARITY ERRORS
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Under certain circumstances, the serial ports on some Premium computers may
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exhibit parity errors during serial data transmission. The problem manifests
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itself as a bad parity bit when transmitting data with 8 Bits, 1 Stop Bit and
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Even Parity.
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The problem is caused by an anomaly in the Zymos 16C451 and 16C452 Dual UART
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serial controller chips that were once used on some Premium motherboards.
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Users experiencing this problem can resolve the problem in either of the
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following ways:
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1. Change the data transmission parameters from; 8 Bits, 1 Stop Bit, Even
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Parity, to; 8 Bits, 1 Stop Bit No Parity.
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2. Contact your AST Authorized Service Center and arrange for the
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replacement of the system's motherboard.
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ASSEMBLIES AFFECTED:
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Chip Identification: Chips can be identified by observing the soldered-in
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chips at the following locations. These chips will
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be labeled either, "ZYMOS 16C451" or "ZYMOS
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16C452".
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AST
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DESCRIPTION PART NUMBER CHIP LOCATION
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PCB Premium Motherboard 202273-00X U104
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PCB Premium Motherboard 202356-00X U104
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PCB WS 386SX Motherboard 202276-00X U123
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PCB Bravo 386SX Motherboard 202343-00X U9
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PCB Bravo 286 Motherboard 202286-00X U6
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