English Amiga Board - View Single Post - Warp Engine SCSI driver converted for PP&S Zeus 040 (and others)

Toni Wilen · 28 February 2018, 19:51

And now something totally different: MacroSystem Warp Engine warpdrive.device SCSI driver converted to other 53C710 based SCSI controllers.

This quick project started when I saw request from wmaciv asking for working PP&S Zeus 040 SCSI driver. Official driver is quite bad, it uses all CPU time and is quite buggy.
I took the challenge because technically it should be easy (and it was!), 53C710 is all-in-one SCSI chip, no external DMA or other hardware needed so the "only" task was remapping 53C710 registers.

There was two obvious choices for driver, A4091 or Warp Engine. I chose Warp Engine because Warp Engine ROM driver is in normal relocatable executable format (+small loader) which made it easy to disassemble. Note that 53C720 is too different and can't be used with 53C710 driver or vice versa. All later variants (including 53C8xx) are fully or almost compatible with 53C720.

Executable version (run it in shell, drives get detected and partitions mounted) Zeus 040 driver was quickly done under emulation (I don't have Zeus 040) and surprisingly it worked perfectly on real hardware too (I didn't really expect it..). ~8M/s speed using SCSI2SDv6 with over 90% CPU availability.

Next step was ROM version (not yet tested, Zeus 040 has unusual ROM chip package size). And finally I also did two mostly useless versions: one for A4091 and another for A4000T built-in SCSI.

Included drivers:

warpdrive_a4000t: Executable/rommable A4000T driver.
warpdrive_a4091.rom: A4091 ROM driver. (No executable version because A4091 does not have no-autoboot jumper)
warpdrive_zeus040: Executable Zeus 040 driver.
warpdrive_zeus040.rom: Zeus 040 ROM driver (needs odd/even splitting).

A4091 and A4000T drivers are emulation only tested but I expect them to work because Zeus 040 driver worked perfectly fine on real hardware

Ignores SCSI ID/mode jumpers: ID=7, 100ns sync mode (fastest possible).
ROM version mode can be changed if needed by changing single value using hex editor.
Executable versions take optional parameter (0 to 7) which matches Warp Engine K, J and H jumper setting.

Currently only uploaded to the zone (warpengine_driver_hacks.zip). If spreading hacked files based on 3rd party drivers is not ok, I'll replace them with patches against Warp Engine ROM image.

28 February 2018, 19:51	#1
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	Warp Engine SCSI driver converted for PP&S Zeus 040 (and others) And now something totally different: MacroSystem Warp Engine warpdrive.device SCSI driver converted to other 53C710 based SCSI controllers. This quick project started when I saw request from wmaciv asking for working PP&S Zeus 040 SCSI driver. Official driver is quite bad, it uses all CPU time and is quite buggy. I took the challenge because technically it should be easy (and it was!), 53C710 is all-in-one SCSI chip, no external DMA or other hardware needed so the "only" task was remapping 53C710 registers. There was two obvious choices for driver, A4091 or Warp Engine. I chose Warp Engine because Warp Engine ROM driver is in normal relocatable executable format (+small loader) which made it easy to disassemble. Note that 53C720 is too different and can't be used with 53C710 driver or vice versa. All later variants (including 53C8xx) are fully or almost compatible with 53C720. Executable version (run it in shell, drives get detected and partitions mounted) Zeus 040 driver was quickly done under emulation (I don't have Zeus 040) and surprisingly it worked perfectly on real hardware too (I didn't really expect it..). ~8M/s speed using SCSI2SDv6 with over 90% CPU availability. Next step was ROM version (not yet tested, Zeus 040 has unusual ROM chip package size). And finally I also did two mostly useless versions: one for A4091 and another for A4000T built-in SCSI. Included drivers: warpdrive_a4000t: Executable/rommable A4000T driver. warpdrive_a4091.rom: A4091 ROM driver. (No executable version because A4091 does not have no-autoboot jumper) warpdrive_zeus040: Executable Zeus 040 driver. warpdrive_zeus040.rom: Zeus 040 ROM driver (needs odd/even splitting). A4091 and A4000T drivers are emulation only tested but I expect them to work because Zeus 040 driver worked perfectly fine on real hardware Ignores SCSI ID/mode jumpers: ID=7, 100ns sync mode (fastest possible). ROM version mode can be changed if needed by changing single value using hex editor. Executable versions take optional parameter (0 to 7) which matches Warp Engine K, J and H jumper setting. Currently only uploaded to the zone (warpengine_driver_hacks.zip). If spreading hacked files based on 3rd party drivers is not ok, I'll replace them with patches against Warp Engine ROM image.