An ongoing debate fostered by Stewart Alsop rages over when we’ll unplug the last mainframe. (Does this mean there are debates alsoped by Ed Foster? Inquiring minds want to know.)

Back in the good old days, microcomputers processed eight bits, minicomputers sixteen, and mainframes thirty-two. Then progress happened. The laptop computer I’m using to write this column has more raw processing power, and even with lowly Windows/95 crashes less often than the IBM 360/158 I used in 1980.

Stewart has concluded we’ll never unplug the last mainframe. I’m forced to agree, because mainframe isn’t a class of technology, it’s a state of mind. The mainframe mentality – central control – has gained renewed popularity.

Sherman, set the Wayback Machine for 1980. Apple computer dominates the fledgling personal computer market with a 6502 microprocessor, a 40-column screen, and VisiCalc. Accountants flock to this puppy. Why? Because it makes them independent of Data Processing, that’s why.

Well, progress has overtaken us:

• Various forms of .ini files have made it impossible for end-users to be self supporting, just as fuel injection spelled the end of home car care.

• Local Area Networks means our formerly independent systems now plug into a shared resource, and we may even load software from central file servers.

• Electronic Mail and shared directories mean we ship files back and forth, which in turn means we have to agree to common file formats.

Progress is just dandy. In this case it means more powerful systems that are easier to use and provide more value than ever before. The price?

The combination of interconnectedness and maintenance complexity has given central IS a logical reason to regain the control it lost when PCs hit their growth curve in the mid-1980s.

Many IS departments now forbid end-users from loading software into their PCs – only IS-approved standards may be used. That’s fine if IS has a standard – if your employer uses WordPerfect, why should you insist on using WordPro? – but it makes no sense when IS provides no tool and forces users to do without.

Another example of the trend: Not all that long ago, I heard several senior IS executives talk about the importance of getting control over all the “hidden code” that had come into being over the past ten years in their enterprises. The code in question? Formulas in spreadsheets.

Yes, these people seriously believed it would be in their companies’ best interests if IS gained control over the formulas embedded in the various and sundry spreadsheet models employees had created to help them do their jobs.

Why? Two reasons. First, some spreadsheets go into production, serving as crude database management systems that keep track of departmental information. Second, IS supposedly has a far better understanding of how to create consistent “business rules” in ways that encourage code re-use and logical consistency than the end-users who keep on re-inventing the wheel in the various spreadsheets they build.

While clearly absurd (why IS should have any more to say about the contents of an electronic spreadsheet than it does over one created with graph paper, pencils and calculators is beyond me) the trend back to central control is gaining force.

Yes, it’s absolutely true that end-users use spreadsheets to manage databases, using the wrong tool for the job and creating maintenance headaches downstream. I use a screwdriver to open paint cans, for that matter. There are no “Paint Can Tool Police” to stop me, and if I bend the screwdriver, that’s my business.

Duplication of effort is a price companies pay for empowered employees who act independently. Inconsistent spreadsheet formulas are simply the electronic consequence of diverse perspectives about the business.

And IS isn’t all that good at consistency. It manages multiple databases. Equivalent fields in different databases usually have different formats, inconsistent values, and often, subtle differences in the semantics of their definitions.

The personal computer was a key enabler of employee empowerment. Resist the trend back to mainframes. Give end-users as much freedom as you can.