eric F.

@ef1j95

The three 0x07’s make for a few friendly bell rings as it goes.

1/12/2019, 11:19:29 AM

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eric F.

@ef1j95

Want to replace one 0x07 with 0x05, but it starts the auto reply and doesn’t punch. Not sure how to disable...

1/12/2019, 1:37:05 PM

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eric F.

@ef1j95

Since cover of the Olivetti is off again, decided to dive in and figure out the ENQ (or CHI E’) function once and for all.

2/13/2019, 9:35:35 PM

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eric F.

@ef1j95

This requires a closer look at the GRUPPO FUNZIONI or function unit. This is a series of “feelers” beneath the code bars that detect certain control characters, like BELL, CR, LF, etc. Here’s how the feelers work...

2/13/2019, 9:40:24 PM

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eric F.

@ef1j95

A closer look at the function unit with the bottom panels removed. You can see the lower part of the “programmable” actuators. These push two bars that suppress carriage advance or printing (or in most cases except for SPACE, both.) The function unit is model F 813.

2/13/2019, 9:47:43 PM

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eric F.

@ef1j95

Notice also the bar running up to the bell clapper. CNTL-G does indeed ring the bell.

2/13/2019, 9:48:06 PM

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eric F.

@ef1j95

As with the BELL, actuators can also push bars to control other operations. CR of course triggers the carriage return mechanism, there are control codes to stop and start the punch, etc. So, I have to figure out how the ENQ actuator is suppressing the reperforator.

2/13/2019, 9:54:24 PM

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eric F.

@ef1j95

Well, I found the rod that triggers the reperforator for every character except ENQ, 0x05. I just have to trace it back to the function unit... which will have to wait...

2/13/2019, 9:57:39 PM

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eric F.

@ef1j95

Reperforator Victory! I can now punch 0x05.

2/14/2019, 11:20:04 PM

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eric F.

@ef1j95

Underneath the Olivetti, the left-most actuator 1 moves link 2, which rotates 3 inward and the hook 4 outward. The hook catches the bend on 5 and prevents it from moving down. Otherwise 5 pulls a rod to activate the punch. Two other bends suppress carriage advance and stroke.

2/15/2019, 6:35:41 AM

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eric F.

@ef1j95

I was able to detach the link and rotate the hook past the bend. The Olivetti was not harmed and the fix is reversible. I hope I didn’t void the warranty.

2/15/2019, 6:46:16 AM

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eric F.

@ef1j95

Can punch some Z’s now...

2/15/2019, 8:25:16 AM

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