If your using a cf flash chip; remember that you have to run fdisk/mbr to get a usable mbr and the chip has to set to active mode with fdisk - otherwise it won't boot for you.
DS On Mon, 2 Jan 2017 02:33:10 +0100 userbeit...@abwesend.de writes: > Hello again! > I just wanted to report back for all of you who helped me and gave > great > inputs. > > Thanks for the CHS/LBA info. > This is an IDE Flash module that goes directly into the MBs slot. It > > doesn't allow to connect another device beside it, so it also > doesn't > have a master/slave jumper. > > It has a capacity of 512 MB. I tested it on another PC, from around > 2000, which auto-detected it as C/H/S 993/16/63 (no boot-up as it > was > still empty at that time, I just did the BIOS auto-detection). > > > On the 486 I've put that in for the IDE device as custom type 82. > The > other values, LZ and WP, I left at 0. I assume for a flash drive > they > are simply not important. > > But it doesn't boot. It halts with the error message: "partition > signature != 55AA" > > I've personally checked: all partitions and the MBR have that > signature. > > I managed to find an old external USB HDD which has an IDE interface > > inside, and I connected the flash module to my regular PC. > > > # dmesg | tail > > [23705.522176] scsi 7:0:0:0: Direct-Access TRANSCEN > D 0000 PQ: 0 ANSI: 0 > > [23705.522746] sd 7:0:0:0: Attached scsi generic sg3 type 0 > > [23705.523265] sd 7:0:0:0: [sdc] 1000944 512-byte logical blocks: > > (512 MB/489 MiB) > > [23705.524141] sd 7:0:0:0: [sdc] Write Protect is off > > [23705.524145] sd 7:0:0:0: [sdc] Mode Sense: 27 00 00 00 > > [23705.525012] sd 7:0:0:0: [sdc] No Caching mode page found > > [23705.525018] sd 7:0:0:0: [sdc] Assuming drive cache: write > through > > [23705.528556] sdc: sdc1 sdc2 sdc3 > > [23705.531653] sd 7:0:0:0: [sdc] Attached SCSI disk > > > # parted /dev/sdc print > > Model: TRANSCEN D (scsi) > > Disk /dev/sdc: 512MB > > Sector size (logical/physical): 512B/512B > > Partition Table: msdos > > Disk Flags: > > > > Number Start End Size Type File system Flags > > 1 32,3kB 52,7MB 52,7MB primary > > 2 52,7MB 74,0MB 21,3MB primary > > 3 74,0MB 480MB 406MB primary fat16 boot > > As you can see, the third primary partition is for FreeDOS. I've > decided > to create a 50 MB partition for DR DOS and a 20 MB partition for > MS-DOS > or any other DOS I want to test (like PC DOS, PTS-DOS). > > The third partition has been made bootable with "format c: /s /q". > I've > also rewritten the MBR using "fdisk /mbr". All partitions are > formated. > The first two partitions are otherwise empty. > > I've also used Linux's dd (e.g. "dd if=/dev/sdc1 bs=512 count=1 > of=bootsec1.bin") to check if the boot signature 55AA is present on > all > partitions + on the MBR and it is. > > > Thinking logically: If the BIOS wouldn't check, it should boot. The > MBR > code should find the active partition #3 and chainload the > bootsector. > This should include the bootcode for FreeDOS, since I've formated it > > with /s and the system files are on the parition. > I hate it when a BIOS checks stuff that it rather shouldn't care > about! > > Any other error message and it could have been FreeDOS, but I am > sure > this one if from the BIOS _before_ it executes the MBR boot code. > > > > Maybe the next time I will try only one partition first... Anyway: > again, I've come to a halt for now. > > I appreciated your help. > Happy 2017. > Userbeitrag. > > > ------------------------------------------------------------------------- ----- > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Freedos-user mailing list > Freedos-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/freedos-user > ******************************************************>>>> >From Dale Sterner - MS organic chemistry http://pubs.acs.org/doi/abs/10.1021/jo00975a052 *******************************************************>>>> ____________________________________________________________ How To Fix Cracked Feet Dermal Medix http://thirdpartyoffers.juno.com/TGL3141/586ab967437fb39670482st51duc ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
