Minor Tektronix success story.

From: Dellett, Anthony <Anthony.Dellett_at_Staples.com>
Date: Mon Aug 17 16:28:26 1998

Hmmm... Is the 4046 the SCSI Floppy Disk/Hard Disk rack mountable unit?

Tony

> -----Original Message-----
> From: Joe [mailto:rigdonj_at_intellistar.net]
> Sent: Monday, August 17, 1998 11:55 AM
> To: Discussion re-collecting of classic computers
> Subject: Re: Minor Tektronix success story.
>
>
> I just picked up a Tektronix 4041 computer. I think it's a general
> purpose HP-IB instrument controller similar to a HP 9915.
> How close is it
> to your 4052? I HAD a Tektronix 4046 disk drive unit for
> the 4041 a few
> months ago but I traded it off (A_ S___!) Does anyone know
> anything about
> the keybaords for the 4041? It uses a strange 4 pin
> connector. I've heard
> that you can operate them from a terminal. Does anyone know
> anything about
> this?
>
> Joe
>
> At 07:14 PM 8/17/98 GMT, you wrote:
> >A minor success story compared with some I read here, but I
> wanted to
> >share it with you...
> >
> >This weekend I finally got my Tektronix 4052 graphics
> computer loading
> >and saving on a Commodore 8050 disk drive. The problems:
> >
> >Commodore's weird handling of IEEE-488 protocol, especially
> with OPEN
> >and CLOSE. This requires bit 7 (the 128s bit) to be set
> when sending a
> >secondary address; bit 4 - usually the 16s bit of the
> address - tells
> >the drive whether it's an open or a close.
> >
> >This was easily solved - the Tektronix WBYTE statement gives full
> >control over such things.
> >
> >But the Tek is designed as a tape based machine. You FIND a
> file on the
> >tape and type OLD to load it. The machine then resets and loads the
> >program.
> >
> >On a disk, you WBYTE _at_40,240: some bytes to specify the file
> name. But
> >if you type OLD _at_8,0: it asserts IFC during the reset, thus
> causing the
> >drive to have forgotten all about your program by the time
> it comes to
> >load it...
> >
> >So I toyed with the idea of cutting the IFC line in a
> suitable cable.
> >But then I came across the APPEND statement. "APPEND _at_I/O
> address:line
> >number" loads a program without resetting, renumbering it to
> start at
> >the specified line. Neat.
> >
> >So I now have a program to display the directory of the
> disk, prompt you
> >for a filename and APPEND the file on the end of itself. It then
> >performs an INIT (initialise variables, IFC and things) and
> drops into
> >the program.
> >
> >Saving is easier, so less automated. You type something like
> >WBYTE _at_40,241:48,58,80,82,79,71,82,65,77,32,78,65,77,69,-13
> >WBYTE _at_63:
> >SAVE _at_8,1
> >WBYTE _at_40,225,63:
> >
> >Not perfect, but it works. If anyone has an 8050 at the VCF, I'll
> >happily demonstrate!
> >
> >Now, has anyone got a PET hard drive? And, for that matter,
> has anyone
> >got a MUPET system for sale?
> >
> >Philip.
> >
> >
>
Received on Mon Aug 17 1998 - 16:28:26 BST

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