inkleput{at}isp.com wrote:

>Robert Gammon  said:
>
>  
>
>>It may be advisable to ask a HP service tech if the newer HP 11 
>>cartridges do store an expiration date that the printer reads. The 
>>printer then has to keep a battery backed up real-time clock to compare
>>against.
>>    
>>
>
>What condition does a dead battery cause?  Instant halt of ink flow or
>scrapping of the record keeping altogether?
>
>Jim L, via eCS 1.14 version of OS/2
>  
>
Same issue as a dead battery in your PC, clock defaults to some preset 
date/time in history. In this case, no printing until the clock is 
brought up to date/time.

page count and ink consumption records are stored in non-volatile memory 
(EEPROM and similar). That sort of record keeping mechanism works for 
thousands of cycles of writes. for true long term storage, the 
timekeeping function needs a small amount of RAM that is battery-backed 
so that endless writes can occur independent of power.

I actually don't believe that HP or any printer manufacturer would 
resort to such an obselence scheme. Most folks do not refill their own 
print cartridges anyway, particularly in the business world. The 
nightmares of support are too extreme as the maintenance costs of such 
printers would rise. Also, the user inderface on the printer would have 
to change. A keypad and a clock display would have to be provided. Only 
the higher end printers could afford the overhead of this added expense, 
i.e printers costing $500 and higher.

Certainly no consumer level printer costing $100-$200 could afford this 
added expense!!

-- 
Robert Gammon   
Houston, TX




 
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