IBM 6643, 2179 manual Hardware Maintenance Manual

Models: 2179 6643

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The IRQ levels, DMA channels, I/O address, and ROM and RAM addresses all become potential conflicts and system problems. When conflicts arise, they might show up as system hangs, lost or missing devices, incorrect or bad data, or failing diagnostics. Always eliminate conflicts in these areas before replacing any hardware components.

110Hardware Maintenance Manual

Page 118
Image 118
IBM 6643, 2179 manual Hardware Maintenance Manual