[Coco] DE1 ALTERA coco3

Bill Pierce ooogalapasooo at aol.com
Fri Dec 18 03:07:26 EST 2015

A vhd will work on both emulators and Drivewire. There's no difference. In fact, under NitrOS9 with dw4, you should have access to 4 VHDs as long as you have the drivers installed. This should work on ANY form of Coco... real, emulator, CocoFPGA, etc.
If you downloaded that vhd from the Coco Archives, then it's most likely a dual partition vhd in that it has an OS9 partition and an RSDOS partition. It is setup to boot from the rsdos partition in rgbdos or hdbdos. The os9 partition is first, so hdb/rgb dos needs to know where the rsdos partition is. You have to set an offset in hdb/rgb dos to reflect the sector size of the os9 image.
The vhd in the archives has an offset of $5A000 set by poking hdb/rgbdos:

This sets the offset to the rsdos partition (only in hdbdos or rgbdos)
To boot os9, you just :

As a word of warning, that vhd has NitrOS9 3.2.9 and does NOT include the dw4 drivers, so it will not boot under dw4. It was meant to boot from RGBDOS in VCC using VCC's native emulated HD.
It is also an old buggy version of NitrOS9. We are up to 3.3.0 now and it's the most stable build we've had.
If you want bootable NitrOS9 disks for DW4, try here:

I'm pretty sure that vhd has the bootdisk at 254.
I say this because I'm pretty sure there's only one vhd in the archives and it was set up for VCC with RGBDOS.



All disks ending with "dw" will boot under dw4.

Bill Pierce
"Charlie stole the handle, and the train it won't stop going, no way to slow down!" - Ian Anderson - Jethro Tull


My Music from the Tandy/Radio Shack Color Computer 2 & 3
Co-Contributor, Co-Editor for CocoPedia
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E-Mail: ooogalapasooo at aol.com



-----Original Message-----
From: Dave Philipsen <dave at davebiz.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Fri, Dec 18, 2015 1:50 am
Subject: Re: [Coco] DE1 ALTERA coco3

Ok, I think I understand what you're trying to do but I honestly don't have any experience with vhd files.  I've only ever run a CoCo emulator once or twice.It sounds like you're trying to convert an OS9 vhd file so that it can be used with Drivewire.  In theory it shouldn't be too difficult to do but I don't know if anyone's come up with a way to do it.DaveOn 12/17/2015 11:21 PM, camillus gmail wrote:> Thanks Dave, I look into that.> What I want to do, is not easy to explain in e few words...LOL> What I tried to do is, to put an existing OS9.vhd file ( sourced from some archive )> into drive 0 in DW, and then I can do Dir on the FC ( = fpga coco ) that gives me the usual garbled of being a OS9 disk. But "dos" does give me an "ok" prompt. "bootos9" gives "sn error".>> So what is the use of vhd files and how do I use those.>> This is just playing Dave, please do not loose any sleep over it.> I will hopefully bring my setup along at the cocofest, and then maybe some more experienced person. will set me on the right track.>   >> cb> On 12/17/2015 5:48:17 PM, Dave Philipsen <dave at davebiz.com> wrote:> Hi, Camillus. Check the CoCo3FPGA group file section. Gary has been> constantly updating the documentation and it should be included in one> of the more recent releases.>> A quick summary: KEY3 = reset, KEY0 when held down during reset will> bring up the "3 mugateers" easter egg.>> SW0 off = normal speed, on = turbo speed.>> With DW under NitrOS9 you can create very large drives, probably much> larger than you would ever need to use. What do you want to do?>> Dave Philipsen>>> On 2015-12-17 16:39, Camillus wrote:>> Hi, super coco users,>>>> Is there anywhere some info about the working of all the switches and>> buttons, on the DE1 Altera Board?>> Or any User Manual when fpgacoco core is installed?>>>> ( to Dave, the file you sended was ok. OS9 booted right up.)>>>> I need also someone who can help me in the right direction to run FLEX>> on this board.>>>> Then my last question, I can only use 4 drives is DW4, so vdh disks>> are out of my range, but I hope I'm wrong again...LOL>> Any help on that?>>>>>> thanks y'all in advance>> Camillus>>>>>> Sent from Mailbird>> [http://www.getmailbird.com/?utm_source=Mailbird&utm_medium=email&utm_campaign=sent-from-mailbird]> --> Coco mailing list> Coco at maltedmedia.com> https://pairlist5.pair.net/mailman/listinfo/coco>>> ---> This email has been checked for viruses by Avast antivirus software.> https://www.avast.com/antivirus>-- Coco mailing listCoco at maltedmedia.comhttps://pairlist5.pair.net/mailman/listinfo/coco

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