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83 lines
2.2 KiB
Markdown
83 lines
2.2 KiB
Markdown
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[← Home](../README.md) · [Libraries](README.md)
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# expansion.library — Zorro Bus and AutoConfig
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## Overview
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`expansion.library` handles automatic configuration of Zorro II/III expansion boards. At boot, the OS scans the expansion bus and assigns base addresses to each board based on its AutoConfig ROM.
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---
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## AutoConfig Sequence
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1. Board asserts `CFGIN` to request configuration
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2. CPU reads 256-byte config area at `$E80000`
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3. Board reports: manufacturer ID, product ID, board size, flags
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4. OS assigns a base address via `WriteExpansionByte`
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5. Board relocates to assigned address
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6. Next board in chain is configured
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---
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## struct ConfigDev
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```c
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/* libraries/configvars.h — NDK39 */
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struct ConfigDev {
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struct Node cd_Node;
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UBYTE cd_Flags; /* CDF_* flags */
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UBYTE cd_Pad;
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struct ExpansionRom cd_Rom; /* AutoConfig ROM data */
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APTR cd_BoardAddr; /* assigned base address */
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ULONG cd_BoardSize; /* board size in bytes */
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UWORD cd_SlotAddr; /* slot address */
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UWORD cd_SlotSize;
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APTR cd_Driver; /* driver bound to this board */
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struct ConfigDev *cd_NextCD; /* next in chain */
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/* ... */
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};
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struct ExpansionRom {
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UBYTE er_Type; /* board type + size code */
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UBYTE er_Product; /* product number */
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UBYTE er_Flags;
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UBYTE er_Reserved03;
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UWORD er_Manufacturer; /* manufacturer ID */
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ULONG er_SerialNumber;
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UWORD er_InitDiagVec; /* boot ROM offset */
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/* ... */
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};
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```
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---
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## Finding Expansion Boards
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```c
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struct Library *ExpansionBase = OpenLibrary("expansion.library", 0);
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struct ConfigDev *cd = NULL;
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while ((cd = FindConfigDev(cd, 2167, 11))) {
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/* manufacturer=2167 (Individual Computers), product=11 (ACA500plus) */
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Printf("Board at $%08lx, size %lu\n", cd->cd_BoardAddr, cd->cd_BoardSize);
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}
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```
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---
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## Common Manufacturer IDs
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| ID | Manufacturer |
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|---|---|
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| 514 | Commodore |
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| 2017 | GVP |
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| 2167 | Individual Computers |
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| 8512 | Phase5 |
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---
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## References
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- NDK39: `libraries/configvars.h`, `libraries/expansion.h`
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- ADCD 2.1: expansion.library autodocs
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