USBasp compiler to compile their own, support software automatically speed down, retain the jumper forced down speed. Because it will only modify the speed down code, I do not know support does not support the S5x series. Source code version of the latest version of the 2011 to modify.

firmware\clock.c
........\clock.h
........\isp.c
........\isp.h
........\main.c
........\Makefile
........\tpi.h
........\tpi.S
........\tpi_defs.h
........\usbasp.h
........\usbconfig.h
........\...drv\asmcommon.inc
........\......\Changelog.txt
........\......\CommercialLicense.txt
........\......\License.txt
........\......\oddebug.c
........\......\oddebug.h
........\......\Readme.txt
........\......\USB-ID-FAQ.txt
........\......\USB-IDs-for-free.txt
........\......\usbconfig-prototype.h
........\......\usbdrv.c
........\......\usbdrv.h
........\......\usbdrvasm.asm
........\......\usbdrvasm.S
........\......\usbdrvasm12.inc
........\......\usbdrvasm128.inc
........\......\usbdrvasm15.inc
........\......\usbdrvasm16.inc
........\......\usbdrvasm165.inc
........\......\usbdrvasm18-crc.inc
........\......\usbdrvasm20.inc
........\......\usbportability.h
........\usbdrv
firmware

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