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- Date: Thursday, 22 November 1984
- From: Jesse Eaton
- To: Osborne Exec users
- Re: IEEE-488/CENTRONICS on OSBORNE
-
- The following diagram should allow you to connect the OSBORNE EXECUTIVE'S
- IEEE-488 port to a CENTRONICS port:
-
- IEEE-488 CENTRONICS
-
- 1 ------- DATA0 (LSB) -----> 2
- 2 ------- DATA1 -----------> 3
- 3 ------- DATA2 -----------> 4
- 4 ------- DATA3 -----------> 5
- 13 ------- DATA4 -----------> 6
- 14 ------- DATA5 -----------> 7
- 15 ------- DATA6 (MSB)------> 8
- 16 ------- DATA7 (PAR) -----> 9
- 6 ------- STROBE* ---------> 1
- 12 ------- GROUND ----------> 19
- 8 <------ BUSY ------------- 11
-
- NOTE: STROBE IS NORMALLY NEGATIVE GOING PULSE.
- BUSY LINE IS HIGH WHEN PRINTER IS BUSY. THERE ARE PULLUP
- RESISTORS ON THE IEEE-488 WHICH PULL THIS LINE HIGH IF THE CABLE IS
- UNPLUGGED OR IS WIRED INCORRECTLY.
-
-
- GOOD LUCK AND LET ME KNOW HOW IT TURNS OUT. I STILL HAVE TO REWIRE MY CABLE
- AS I TOO USED THE DIAGRAM ON PAGE 445 IN THE SYSTEM REFERENCE MANUAL. WE
- "ALL" KNOW THAT IS OUT TO LUNCH.
-
- Jesse (all for better, more correctter documintasion) Eaton.
-
-
- Date: Friday, 23 November 1984
- From: Ronald Blanford
- To: Jesse Eaton
- Re: IEEE-488/CENTRONICS on OSBORNE
-
- The IEEE 488 to Centronics wiring diagram you gave works like a charm.
- There's still one minor problem unrelated to the wiring, and that's
- that the Executive's BIOS times out occasionally when the printer is
- busy and thinking that it's nonexistent asks if you want to deassign
- it. Answering "no" lets you continue just fine, but this is a
- nuisance because it occurs quite often with my slow letter-quality
- printer. The timeout delay should be patchable, but I haven't looked
- enough to find it yet.
-
- Thanks, Ron
-
-
- Date: Friday, 23 November 1984
- From: Jesse Eaton
- To: All Osborn Exec users
- Re: OSBORNE EXECUTIVE PRINTER TIMEOUTS
-
- The most recent version of the Osborne Executive Bios is V1.1. It
- allows you to set the timeout value for printers. The SETUP.COM
- program was also modified to reflect this.
-
- Jesse (hacker isn't a dirty word) Eaton
-
-
-
- Date: Friday, 23 November 1984
- From: Jesse Eaton
- To: All Osborn Exec users
- Re: OSBORNE EXECUTIVE IEEE-488 PORT
-
- The IEEE-488 port on the OSBORNE EXECUTIVE can be configured via a PIA
- chip to communicate using the CENTRONICS or IEEE protocol to talk to
- devices connected on that port. If you plan on doing any serious
- hardware hacking using it I would highly recommend the five manual
- Technical Reference set. They contain BIOS and ROM listings for V1.1
- as well as tutorials on the schematics and chip sets. The price is
- steep however. $125 + $18 (S&H).
-
- Jesse (the librarian) Eaton
-