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That is, after you find it!

The user manual for the 1500 clearly states that it does nothing unless it is charging or is fully charged, meaning yellow or green.

So it does NOT blink when the battery is removed while on the power supply. That's a relief!

And I like it that way. Wish the 1800 and 2810 could be taught NOT to blink... but for now, I'll be happy to get them working RIGHT!

The only issue remaining then, is the question ...

As in learned knowledge...

Today I learned that the 1500 may have a problem in the charging/power circuit(s)...
While 'playing' with the 'broken' 1800 I noticed that w/o the battery contacts connected the charge light BLINKED yellow when it would normally sit SOLID yellow while charging. I presumed that it was due to a flaw in the system board, considering the battery-acid damage.
The 2810 arrived today and did the exact same thing with the battery removed. The (impeccable) ...

I have a large inventory of cases, keyboards, monitors, software, circuit boards, whatever .... for these two Osborne computers. Maybe even some complete, working units of the O-1. Please contact me with your needs as this is all soon going to recycling.
Al
340-277-1433
skypilot177@yahoo.com

Hi, My name is Bob. I live in Akron, Ohio. I am married to a wonderful lady. Her name is Lynn. We have three grown children, three dogs. I found an old radio on the curb. It is a Knight radio. Well, that started me into antique radios. I have acquire more radios. I also have a nice Eico tube tester. I have a chance to get a rf generator and oscilloscope of Ebay from a local guy. I just have to a manual for the oscilloscope. Well, that's about it. Glad to be here. Thanks, Bob
PS. The manual ...

To announce that I have FINALLY acquired (thru ebay) my 2810HD

AFAIK it is 'mostly' a duplicate of the 1800, with a few 'additions':
1) External VGA port,
2) External KBD port (PS/2-type),
3) 4 Mb (4x1mb-30p SIMM) expandable memory (which I already have ),
Shows how bad the ole memory is here! (See new post!)
4) ... 16Mhz CPU (If I recall correctly).

With any luck, it will be able to 'guide' me thru the work on the 1800! ...