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Dos/Obsd69 Hybrid CD
Hello,
I have a couple of machines, where to update BIOS, there either should be a Windows installation, or I have to boot from MS-DOS using the floppy diskette. Unfortunately I have only 1 working floppy drive left and using it with all the machines is inconvenient. I decided to make MS-DOS bootable from CD. To use just 1 CD for all tasks, I decided to make it multuboot MS-DOS and OpenBSD installer. The multiboot cd has 2 options: 1) Start MS-DOS 98 and drop the user into it's shell (default, timeout 10) 2) Run OpenBSD 6.9 AMD64 installer, same as official cd69.iso The error message during OpenBSD install Code:
cannot open cd0a:/etc/random.seed: No such file or directory The file is created during shutdown, and since there was no shutdowns, there is no file present. It's one of the entropy feeds used by arc4random(4). The size of ISO is 13.1 MiB, OpenBSD file sets are installed from official http. The ISO may be of use to you. Download the ISO here. Try it on the virtual machine before burning it to the CD. |
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The splash-screen lasts 4 seconds, but pressing any key will skip it immediately.
It looks funny, but sometimes you have a tight schedule; pressing Enter 2 times on a title screen will drop you right into the DOS shell. The answers: 1) This is original MS-DOS 98, it will work fine with 32-bit machine. The OpenBSD part of CD is completely unrelated to the DOS part, of course for it to work on 32-bit machine, the ISO needs to be rebuilt using 32-bit OpenBSD installer. I can make CD ISO with only MS-DOS 98, that has no title screen and drops you right into MS-DOS shell, or I can make another version of this CD ISO with 32-bit OpenBSD installer. Tell me if you need it. 2) I usually make an additional 100 MiB FAT partition on all machines' HDDs, MS-DOS 98 can only see FAT, and not the FAT32 or NTFS. BIOS installer files go into the FAT partition on the HDD. And, as soon as you are in the DOS shell, you no longer need a CD. If it's a "new" machine, Burn BIOS installer files onto CD-RW, and replace the CD when you are in the DOS shell. You have to run findcd command after cd replacement. Last edited by bsdun; 20th August 2021 at 05:05 PM. |
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Thanks for the replies.
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dos openbsd hybrid cd multiboot |
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