ataritoobin
Experienced Member
Hello!
I've been working on getting an IBM Model 70-E61 up and running, but am (surprise!) having some issues getting the Reference Disk booted up.
The drive originally in the machine was a ragged Mitsubishi 15F7503 1.44MB 3.5" drive with the top head sheared off. On boot, I'd get the expected 161/163 error.
I found another Mitsubishi 15F7503 and cleaned the heads, cleaned up the worm gear, and recapped it.
I replaced the battery and get the expected 161/163 error on boot.
A downside here is I understand the only way I have access to writing the Reference Diskette floppy using the rf7080a.img source at the moment is less than ideal:
I figured I’d give the TexElec PS/2 to standard floppy adapter a shot with a Sony standard 3.5" PC floppy drive. I was pretty surprised when it gave the exact same result: it will access/initialize the drive, beep twice, seek 4 times, then throw the red “not OK” + IBM manual. If I hit F1, it will seek four more times, then go to BASIC.
For the heck of it, I cleaned up the original drive, sans top head, recapped it and had the same exact result.
If I make a DOS bootable diskette, I get the same result as well, which I'd expect since the system CMOS isn't configured.
At this stage, assuming my Reference Disk is good (which perhaps isn't a sure thing with USB floppy drive, etc?), where would I go next? Is this "seek 4 times" behavior what you see on an unconfigured Model 70 and you try to boot with a non-Reference Disk? I’d imagine it’s possible some floppy disk controller chip might be bad?
Thank you!
I've been working on getting an IBM Model 70-E61 up and running, but am (surprise!) having some issues getting the Reference Disk booted up.
The drive originally in the machine was a ragged Mitsubishi 15F7503 1.44MB 3.5" drive with the top head sheared off. On boot, I'd get the expected 161/163 error.
I found another Mitsubishi 15F7503 and cleaned the heads, cleaned up the worm gear, and recapped it.
I replaced the battery and get the expected 161/163 error on boot.
A downside here is I understand the only way I have access to writing the Reference Diskette floppy using the rf7080a.img source at the moment is less than ideal:
- Windows 10 with external USB floppy and WinImage
- dd in Terminal on MacOS 10.11 with USB floppy
- DOS 5 on Virtual Box on MacOS 10.11 with USBASPI.SYS configured to use the external USB floppy drive. With this setup I tried RAWRITE. If I use REFSTAMP.COM afterwards, it reports that the signature is already stamped. This is the same if i write the disk with WinImage, dd or RAWWRITE. If I try running REFSTAMP on a freshly formatted disk, it will stamp the signature and report "Disk Stamped OK" (so it says).
- That said, I can create a disk using rf7080a.img and have matching checksums with the source image file when I create an image of the resulting disk back into a file. I can see and access the contents on the disk as expected (even on a Quadra 700).
I figured I’d give the TexElec PS/2 to standard floppy adapter a shot with a Sony standard 3.5" PC floppy drive. I was pretty surprised when it gave the exact same result: it will access/initialize the drive, beep twice, seek 4 times, then throw the red “not OK” + IBM manual. If I hit F1, it will seek four more times, then go to BASIC.
For the heck of it, I cleaned up the original drive, sans top head, recapped it and had the same exact result.
If I make a DOS bootable diskette, I get the same result as well, which I'd expect since the system CMOS isn't configured.
At this stage, assuming my Reference Disk is good (which perhaps isn't a sure thing with USB floppy drive, etc?), where would I go next? Is this "seek 4 times" behavior what you see on an unconfigured Model 70 and you try to boot with a non-Reference Disk? I’d imagine it’s possible some floppy disk controller chip might be bad?
Thank you!
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