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Re: Voodoo 2 DOS Glide compatibility matrix

Posted on 2014-12-24, 02:14

I`d give it a go (it`s not like you`re risking anything). Besides, you could also tinker with the command line parameters. QEMM has A LOT of features to increase available conventional/upper memory (some of which are enabled by default, AFAIK), and those might break compatibility with a lot of …

Re: DOS RAM limiter?

Posted on 2014-12-23, 22:14

in DOS
I have to agree, XMSDISK & EMSDISK are great :) Awesome for lowering available RAM. EMSDISK, however, doesn't allow the /t (create from the top,) mode :( So, while EMSDISK still works with the newer QEMM, it doesn't allow games that require RAM to be less than 16MB to run (or the ones I have loaded …

Re: Copy Protection & Image Formats

Posted on 2014-12-23, 19:27

is no different than how Compaq, Phoenix and the rest cloned IBM's PC BIOS. Even if IBM hadn't published the code, a trade secret would not have protected the BIOS from the clone makers. This I actually learned in taking IT classes at TSTC. The original 8088, it's structure, BIOS, etc.., when …

Re: Copy Protection & Image Formats

Posted on 2014-12-23, 19:16

The Cocoa Cola reference doesn't apply, they are producing the product, and selling the product, without publishing the recipe. It's the recipe that is a trade secret, and not the product itself. As for reverse engineering being considered a legal means of acquisition, are you basing that off the …

Re: DOS RAM limiter?

Posted on 2014-12-23, 06:23

in DOS
Were you trying to get Blood running in DOS? I faced the exact problem. I ended up using QEMM 8.0 (8.03 started breaking things.) That being said, if you are just wanting to limit XMS and don't need EMS over 32 MB, then standard HIMEM.SYS with EMM386.EXE and XMSDISK will accomplish that for you. The …

Re: Voodoo 2 DOS Glide compatibility matrix

Posted on 2014-12-23, 03:22

Newer versions of QEMM support more than 64 MB if I recall correctly, you could give that a try I found that out. I was using QEMM 8, and upgraded it to 8.03. Memory jumped up to 256 MB, but it totally broke everything :( So I dialed it back to v8. Not sure if I want to try 9 ('97) the last version …

Re: Copy Protection & Image Formats

Posted on 2014-12-23, 03:18

This is wholly incorrect. A patent allows the holder a 20-year right to exploit the invention covered by the patent, and reverse engineering a patent does not negate the right of the patent holder to enforce his patent. A trade secret is protected so long as it remains a secret. Reverse engineering …

Re: Voodoo 2 DOS Glide compatibility matrix

Posted on 2014-12-23, 01:19

Got it fixed with QEMM386.SYS. HIMEMX.EXE & JEMM386.EXE broke many of my other games. My problem with QEMM386.SYS was that I was also using HIMEM.SYS. Removed that and everything is working again. It limits total DOS RAM to 64 Mb, but that isn't really a problem, haven't found anything DOS that …

Re: Copy Protection & Image Formats

Posted on 2014-12-23, 01:04

Well, if PSI can handle all the protection techniques, and is covered under the same open source license as DOSBox (they said "no" to something or another because it used a different open source license than they did,) then I would be all for it :) From what I understand, there is already a utility …

Re: Copy Protection & Image Formats

Posted on 2014-12-22, 23:00

Ok, let me put it another way :) The authors have repeatedly resisted using any of the other formats. I'm also trying to avoid asking them to do something they've already said "no" to. Also, file formats are rarely if ever patented. They are usually placed under trade secret protection instead. A …

Re: Voodoo 2 DOS Glide compatibility matrix

Posted on 2014-12-22, 22:27

Shouldn't QEMM provide both EMS and XMS? Anyway, you can try FreeDOS' memory manager or JEMM QEMM does, but it sets it as ~256M EMS and ~70M of XMS, and I haven't been able to change that (except to drop it down to 5M of EMS and 0 XMS.) As for JEMM, so far I haven't been able to get that to work …

Re: Copy Protection & Image Formats

Posted on 2014-12-22, 21:51

But how would this be different from just adding support for the TransCopy (or PCE .PSI) format? I don't know about the PSI format, but with TD0 the data is compressed (if only slightly with normal compression.) For one, if a sector doesn't contain anything, it just notes it and doesn't create the …

Re: Voodoo 2 DOS Glide compatibility matrix

Posted on 2014-12-22, 20:41

Well, got Blood working now :) Only problem is that EMM386.EXE maxes out at 32 Mb of EMS. QEMM386 will go higher, but it caps my memory out at 256 Mb (all of which is made EMS,) disables HIMEM.SYS which some of my other games need (get a missing HIMEM.SYS error message,) and blocks XMSDSK from …

Re: Copy Protection & Image Formats

Posted on 2014-12-22, 20:39

We might be having a terminology issue. One of the main things I was trying to avoid was to create a list of copy protection templates. Things like Copy Lock, OSI-1, etc... Those usually use a combination of techniques (though there are those that only use one.) For example, Sierra's (don't know …

Re: Copy Protection & Image Formats

Posted on 2014-12-22, 13:59

would skewing a track off the index with specialized hardware have an effect on a disk read by normal hardware? Probably not: As I understand the data sheet, the FDC does not start reading at the index hole during normal "Read Data" commands but at the Index Address Mark. It only makes use of the …

Re: Copy Protection & Image Formats

Posted on 2014-12-22, 02:22

I must have read it wrong. In non-DMA mode, I thought it said it triggered an interrupt when it was ready to format the next sector (which for the first sector would be right after the index sense.) I'll pull it up again later and read it again (sort of in the middle of 3 different things right now …

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