HW banging IDE harddisk read/write asm source code (FFS/OFS)

jotd · 19 August 2018, 12:43

I already have some code like this (Rob Northen CD/HD IO for CD32) but:

- it only reads files, not file parts
- it's mixed with CD & floppy stuff & would need a lot of reverse engineering to understand & adapt

I know that HRTMon has an IDE mode, and since the source is available, I thought: I'll search in the source. But couldn't locate it. Maybe my version didn't have IDE support anymore (maybe was removed at some point because it only could cope with FFS/OFS)

This is to enhance CD32load hard drive mode. Currently if the game uses diskfiles that don't fit in the remaining memory (ex: 980kb) then it won't work. With a code like this, CD32load would be able to run games from hard drive with only 512k RAM (or even less) more than the original game requirements (for the CD32load run-time + stack)

Toni Wilen · 19 August 2018, 13:09

Check Read_Block and Write_Block in hrtmon sources. But better convert it to use LBA mode first, LBA to CHS conversion is pointless today. (Check ATA-1 spec register description, "d0791r4c-ATA-1.pdf". ATA PIO is really simple to use)

19 August 2018, 12:43	#1
jotd This cat is no more Join Date: Dec 2004 Location: FRANCE Age: 52 Posts: 8,160	HW banging IDE harddisk read/write asm source code (FFS/OFS) I already have some code like this (Rob Northen CD/HD IO for CD32) but: - it only reads files, not file parts - it's mixed with CD & floppy stuff & would need a lot of reverse engineering to understand & adapt I know that HRTMon has an IDE mode, and since the source is available, I thought: I'll search in the source. But couldn't locate it. Maybe my version didn't have IDE support anymore (maybe was removed at some point because it only could cope with FFS/OFS) This is to enhance CD32load hard drive mode. Currently if the game uses diskfiles that don't fit in the remaining memory (ex: 980kb) then it won't work. With a code like this, CD32load would be able to run games from hard drive with only 512k RAM (or even less) more than the original game requirements (for the CD32load run-time + stack)

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19 August 2018, 13:09	#2
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Check Read_Block and Write_Block in hrtmon sources. But better convert it to use LBA mode first, LBA to CHS conversion is pointless today. (Check ATA-1 spec register description, "d0791r4c-ATA-1.pdf". ATA PIO is really simple to use)

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