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AST RESEARCH TECHNICAL BULLETIN TB-0169 4-25-86
AST-5251/12 /HAYES 2400 BAUD MODEM
When using the Hayes 2400 Modem and AST-5251/12, dialing up to an
IBM System 38, you need to have a specific ROM chip in the Hayes
modem. The ROM chip number should be 245 or 249. To determine
which ROM chip you have, send an ATI command to the modem. This
information was provided by Hayes Technical Support.
If you have any additional questions regarding the ROM chip,
please contact Hayes.