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Re: Olivetti M20 emulation status? [Re: rfka01] #97791 01/09/15 08:03 AM
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try dumping as an 8749? should dump the same...

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Re: Olivetti M20 emulation status? [Re: rfka01] #97792 01/09/15 08:19 AM
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I tried, but whereas the results with the tweaked 8048 definition as contained in the archive look sensible apart from the issue Haze pointed out, dumping as an 8749 results in a few jumbled bytes and then a padding of uniform bytes (IIRC FF) until the end of the file.

Last edited by rfka01; 01/09/15 08:19 AM.

NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97793 01/09/15 08:29 AM
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Huh. does your programmer support different manufacturers of the 8749? Some are slightly different timing/pins/etc. try something that matches your device manufacturer first, if you have that option. (i.e. an intel 8049 dump as intel 8749); if that doesn't work try another manufacturer.

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"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Re: Olivetti M20 emulation status? [Re: rfka01] #97794 01/09/15 08:52 AM
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Good idea, I'll try that tonight ... and I'll post the garbage if it doesn't work, maybe you can make heads or tails of it.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97802 01/09/15 11:36 AM
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Andreas Pittini, whose M24 is described here

http://www.z80ne.com/m20/index.php?argument=sections/photos/m24_z8001/m24_z8001.inc

has sent me the BIOS file from his Z8001 card for the M24.

https://dl.dropboxusercontent.com/u/55419307/Olivetti%20M24/M24APB.zip

In order to be correct, the file would have to be split up into odd/even bytes, as the BIOS is contained in two 2764 EPROMS.

The card is described in detail in the "Theory of operation" manual found here:

http://bitsavers.informatik.uni-stuttgar...ation_Nov84.pdf



NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97821 01/09/15 07:28 PM
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I tried dumping the keyboard's 8049 as different 8749s but none of that looks right.

https://dl.dropboxusercontent.com/u/55419307/Olivetti%20M24/M24%20Corrupted%20Keyboard%20dumps.zip

Looks as if this will have to wait until I get another programmer or somebody can step in.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97823 01/09/15 07:48 PM
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Going back to the M20 driver, while hunting for the ROMs of the M24's Alternate Processor Board, I contacted Andreas, whose M20 is pictured here

http://www.z80ne.com/m20/index.php?argument=sections/photos/andreas_8086/andreas_8086.inc

He kindly sent me the ROM dumps of his 8086 Alternate Processor Board for the M20 ... I found we already have that blush , and some code is present in the driver, but I don't know how to enable it.

https://dl.dropboxusercontent.com/u/55419307/Olivetti%20M24/APB-1086.zip

The DOS that has been adapted for the M20 can be found - again - on Davide's excellent site.

http://www.z80ne.com/m20/index.php?argument=sections/download/wrm20/wrm20.inc


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97824 01/09/15 07:54 PM
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I don't see any meaningful code for the APB/i8086 side in the driver, just a few trivial stubs.

Re: Olivetti M20 emulation status? [Re: rfka01] #97825 01/09/15 08:26 PM
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From this discussion

http://it.comp.retrocomputing.narkive.com/hQocwOvb/pcos-per-olivetti-m20

it's clear that the APB-1086 needs the v2.0d or v2.0f firmware, but these two aren't booting PCOS properly at the moment either ... I get complaints about "Disk Error 04 on Drive 0".


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
Re: Olivetti M20 emulation status? [Re: rfka01] #97826 01/09/15 08:44 PM
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Any idea what disk error 04 means?

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