DOS ain't dead - RDISK test

RDISK test - small bugfix. (Announce)

posted by Japheth , Germany (South), 19.05.2009, 12:22
(edited by Japheth on 19.05.2009, 12:41)

I tested RDISK with XMGR and HimemX. While it worked ok in Qemu, I encountered severe problems on a real machine. Usually DOS is telling that it cannot write to the ram-disk's directory.

Using WDE I saw that the ram-disk's root directory contained all 0xFFs, which isn't the proper value (should be 0x00).

I checked the RDISK.ASM source. It's supposed to clear 160 kB of memory in an XMS memory block, but actually clears 80 kB only. This modification might fix it (at least it runs on that particular machine now):

; mov cx,320 ;Get 256-byte block count in 160K. mov cx,320*2 ;Get 256-byte block count in 160K. mov si,(XMSBlk-@) ;Point to our XMS move block. mov [si+8],cs ;Set move source-address segment. I_ClrX: push cx ;Zero next 256-byte block of XMS.

---
MS-DOS forever!

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Complete thread:

New UIDE Available - rr, 28.04.2009, 09:56 (Announce)
- New UIDE Available - Rugxulo, 28.04.2009, 22:43
  - New UIDE Available - sol, 29.04.2009, 00:37
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        New UIDE Available (May 15) - Rugxulo, 17.05.2009, 01:10
        New UIDE (May 15) - Does this work for anyone at all ??? - DOS386, 17.05.2009, 05:26
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        RDISK test - small bugfix. - Japheth, 19.05.2009, 12:22
        RDISK test - small bugfix. - rr, 19.05.2009, 16:30
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