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8
CREDITS.md
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- joevt
- mihaip
## Building
## NT4/PPC fork
- Wack0
## DevOps
- Waqar144
- webspacecreations
@ -16,6 +20,8 @@
- sdkmap
- dressupgeekout
- kth5
- dyharlan
- roytam1
## Testing

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zdocs/developers/dbdma.md Normal file
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The Description-Based Direct Memory Access (DBDMA) relies on memory-based descriptions, minimizing CPU interrupts.
| Channel | Number |
|:-----------------:|:------:|
| SCSI0 | 0x0 |
| FLOPPY | 0x1 |
| ETHERNET TRANSMIT | 0x2 |
| ETHERNET RECIEVE | 0x3 |
| SCC TRANSMIT A | 0x4 |
| SCC RECIEVE A | 0x5 |
| SCC TRANSMIT B | 0x6 |
| SCC RECIEVE B | 0x7 |
| AUDIO OUT | 0x8 |
| AUDIO IN | 0x9 |
| SCSI1 | 0xA |
| Register | Offset |
|:-----------------:|:------:|
| ChannelControl | 0x00 |
| ChannelStatus | 0x04 |
| CommandPtrLo | 0x0C |
| InterruptSelect | 0x10 |
| BranchSelect | 0x14 |
| WaitSelect | 0x18 |
| Command | Value |
|:-----------------:|:------:|
| OUTPUT_MORE | 0x0 |
| OUTPUT_LAST | 0x1 |
| INPUT_MORE | 0x2 |
| INPUT_LAST | 0x3 |
| STORE_QUAD | 0x4 |
| LOAD_QUAD | 0x5 |
| NOP | 0x6 |
| STOP | 0x7 |
| Key Name | Value |
|:-----------------:|:------:|
| KEY_STREAM0 | 0x0 |
| KEY_STREAM1 | 0x1 |
| KEY_STREAM2 | 0x2 |
| KEY_STREAM3 | 0x3 |
| KEY_REGS | 0x5 |
| KEY_SYSTEM | 0x6 |
| KEY_DEVICE | 0x7 |
# References
* https://stuff.mit.edu/afs/sipb/contrib/doc/specs/protocol/chrp/chrp_io.pdf
* https://stuff.mit.edu/afs/sipb/contrib/doc/specs/protocol/chrp/chrp_hrpa.pdf

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zdocs/developers/heathrow.md
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# Heathrow ASIC
The Heathrow ASIC is an intergrated I/O controller designed for use in Power
The Heathrow ASIC is an integrated I/O controller designed for use in Power
Macintosh G3 computers.
Its predecessors are Grand Central and O'Hare ASICs used in other Power Macintosh
@ -90,7 +90,7 @@ Macintosh firmware configures the Heathrow ASIC to live at address `0xF3000000`.
| 0x30 | UnknownReg30 | Not much is known about this register |
| 0x34 | HeathrowIDs | bits for identifying media bay features? |
| 0x38 | FeatureControl | bits for controlling Heathrow operation |
| 0x3C | AuxControl | auxilary control bits |
| 0x3C | AuxControl | auxiliary control bits |
### Device DMA spaces

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zdocs/developers/misc.md
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For serial, it replicates the functionality of a Zilog ESCC. There are two different ports - one located at (MacIOBase) + 0x13000 for the printer, and the other at (MacIOBase) + 0x13020 for the modem.
# DBDMA
The Description-Based Direct Memory Access relies on memory-based descriptions, minimizing CPU interrupts.
| Channel | Number |
|:-----------------:|:------:|
| SCSI0 | 0x0 |
| FLOPPY | 0x1 |
| ETHERNET TRANSMIT | 0x2 |
| ETHERNET RECIEVE | 0x3 |
| SCC TRANSMIT A | 0x4 |
| SCC RECIEVE A | 0x5 |
| SCC TRANSMIT B | 0x6 |
| SCC RECIEVE B | 0x7 |
| AUDIO OUT | 0x8 |
| AUDIO IN | 0x9 |
| SCSI1 | 0xA |
# NCR 53C94
The NCR 53C94 is the SCSI controller.

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zdocs/developers/powerpc.md
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* The 603 relies on the instructions tlbld and tlbli to assist in TLB reloading.
* To accomodate for early programs compiled on PowerPC 601 Macs, the classic Mac OS has to emulate the POWER instructions that were removed from later processors.
* To accommodate for early programs compiled on PowerPC 601 Macs, the classic Mac OS has to emulate the POWER instructions that were removed from later processors.
# References
http://www.ibmfiles.com/ibmfiles/powerpc/itso_powerpc_inside_view.pdf