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IMDS2/IPB/IPC fixes#13419

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Commits on Feb 25, 2025

• ipc: Correct ROM map of Intel IPC

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• ipc: Implement differences between IPB and IPC

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• ipc: Correct ROM sets for IPB

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• ipc: Implement bootstrap ROM en/disable, fix wrong end address

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Commits on Feb 26, 2025

• ipc: fix missing declarations and initializations

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• Add 23.4MHz crystal found on Intel IPB

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• ipc: Fix boundary and initial state of m_boot

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Commits on Feb 27, 2025

• ipc: add alternate v1.2 ROM set found in an actual IPB

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• ipc: correct clock frequency for IPC

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• imds2: Document exactly which MDS model is emulated

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Commits on Feb 28, 2025

• ipc: unmapped memory addresses and IO ports return 0, not 0xFF

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Commits on Mar 10, 2025

• ipc: Remove hack for setting custom initial program counter value

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• i8085: IPC no longer sets initial PC

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