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NeXT
August 26th, 2013, 02:34 PM
We talked about this once before but never concluded what would work.
I have a Rainbow 100 that's pretty much loaded with DEC options. I want to keep (and eventually back up) the 5mb ST506 drive in it which runs MS-DOS but I want to try some extra software like Windows and I need more disk space. The machine has no ISA slots. Any expansion has to be done over the parallel port which means I could use devices such as the SyQuest EZ130, any of the second generation Bernoulli drives because I have Iomega's parallel port adapter, one of my many parallel zip drives and possibly Adaptec's APA-358 parallel to SCSI adapter (though I believe that's way too new).
I have two major problems:

1- The 8088 cannot be replaced with a V20 without ROM modifications I am not setup to perform.
2- I'm running MS-DOS 2.05 and a lot of devices require at least DOS 3.3 and I'm not sure if there was a specific version of 3.3 dedicated to the Rainbow's funky hardware.

Chuck(G)
August 26th, 2013, 03:35 PM
According to the list at Old DOS (http://old-dos.ru), a DEC OEM version of DOS 3.10b was released for the Rainbow.

Looks like there's a copy here (http://www.theoldcomputer.com/roms/index.php?folder=DEC/Rainbow-100).

NeXT
August 26th, 2013, 03:53 PM
Being curious, what will the upgrade to 3.10b enable? I only want to upgrade if I can justify the additional memory consumption or it's necessary for my main issue.

Chuck(G)
August 26th, 2013, 04:05 PM
Partitioning, 16-bit FATs...it should be worth You should be able to use a larger MFM disk instead of the ST506.

yuhong
August 26th, 2013, 05:16 PM
Yea, it seems that 2.11 for Rainbow was limited to 8MB partitions, 3.1 can do 32MB.

yuhong
August 27th, 2013, 12:52 AM
According to the list at Old DOS (http://old-dos.ru), a DEC OEM version of DOS 3.10b was released for the Rainbow.

Looks like there's a copy here (http://www.theoldcomputer.com/roms/index.php?folder=DEC/Rainbow-100).

This is actually from Suitable Solutions, it seems it was quite a battle to get it out officially:
https://groups.google.com/d/msg/comp.sys.dec.micro/CAmqP08wJ_8/IeueDQ3t_ZcJ

NeXT
August 27th, 2013, 06:21 AM
Partitioning, 16-bit FATs...it should be worth You should be able to use a larger MFM disk instead of the ST506.

I want to keep (and eventually back up) the 5mb ST506 drive
I'm not upgrading to a beta release only because it allows for larger partitions. Just sayin'.

Chuck(G)
August 27th, 2013, 08:18 AM
Given the absolute lack of hardware-level compatibility of the Rainbow, all I can say is good luck with that. You could write your own parallel-port drivers for those devices, but it's not a job that I'd want to take on.

If I were looking for source code to mod, however, I'd check some old Linux releases.

yuhong
August 27th, 2013, 10:47 AM
I'm not upgrading to a beta release only because it allows for larger partitions. Just sayin'.
3.10b is not a beta release. It is also released by Suitable Solutions:
https://groups.google.com/d/msg/comp.sys.dec.micro/83-75mw6os0/fe1EDMTv8fsJ

NeXT
August 28th, 2013, 10:28 AM
Ah, okay. I'm too used to the generally standing for "beta" int he open source world when people are already past the 1.xx version numbering.

I assume this is a teledisk image?

NeXT
August 31st, 2013, 03:28 PM
Okay, lets blow everything off the rails. The printer port on a Rainbow is SERIAL. Not parallel.

Chuck(G)
August 31st, 2013, 04:11 PM
Blows nothing off the rails, really. You will need to rig up something that's compatible with the hardware on that port.

NeXT
August 31st, 2013, 05:19 PM
I know of no sort of removable disk option for a PC that used only a serial port.

Chuck(G)
August 31st, 2013, 07:57 PM
There were various serial-port networking setups, Interlink being the most familiar. Beyond substituting a larger hard disk, that's about it as far as I can see.