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Ilia Sharin 2026-04-26 14:46:18 -04:00
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10_devices/scsi.md
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@ -42,14 +42,14 @@ flowchart LR
| **16-bit bus** | Gayle connects via 16-bit data path even on 32-bit CPUs |
| **PIO mode 0** | Stock Gayle supports only PIO mode 0 (~3.3 MB/s theoretical, ~1.5 MB/s actual) |
| **CIA timing** | CIA chip access introduces wait states |
| **CPU overhead** | 100% CPU utilisation during transfers — no multitasking during disk I/O |
| **CPU overhead** | 100% CPU utilization during transfers — no multitasking during disk I/O |
### Community Solutions — Fast IDE
| Solution | Method | Improvement |
|---|---|---|
| **FastATA** (E-Matrix/Elbox) | Zorro SCSI/IDE card with DMA | Up to ~10 MB/s, frees CPU |
| **Buddha/Catweasel** | Clock port / Zorro IDE with optimised driver | ~2–3 MB/s, multiple IDE channels |
| **Buddha/Catweasel** | Clock port / Zorro IDE with optimized driver | ~2–3 MB/s, multiple IDE channels |
| **Blizzard SCSI** | Accelerator-integrated SCSI | Up to ~5 MB/s with DMA |
| **GVP Series II** | Zorro II SCSI with custom DMA ASIC | ~3 MB/s, DMA frees CPU |
| **A4091** | Zorro III SCSI (NCR 53C710) | **~10 MB/s** — fastest stock Amiga SCSI |