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Displaywriter Revisited

clh333

Veteran Member
Joined
Feb 22, 2015
Messages
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Location
Cleveland, OH, USA
In April of 2017 I posted concerning the acquisition of an IBM Displaywriter. I had gone to retrieve some 8-inch drives I had purchased on eBay and brought back an almost-complete system - but missing the keyboard. At the time I had no knowledge of what I had gotten myself into and asked for information.

In the subsequent discussion several members, including robertx, nigwil, Adventurer, Al Kossow and shattered, were kind enough to offer suggestions. I deferred doing anything until I understood better what were my options, as I only have one of these and have a knack for screwing things up. I thought in the meantime I would keep my eyes open for the keyboard.

I had been warned that the keyboards were prized; apparently they are. In the interim I have seen only one come up for sale, on eBay: It sold for over $1000. I will spare you my personal opinion of the situation - it's a (nominally) free country, after all - and merely note that I was unwilling to spend the money.

Recently I have invested time in learning more about 8-inch drives which was my original purpose for obtaining the IBM 8-inch drives. I understand now that the IBM drives, although DSDD and soft-sectored, use a different format from the rest of the IBM world when used with the Displaywriter. The disks that came with my purchase are only going to be useful to the Displaywriter.

Originally I had thought to have acquired about 10 disks of programs and data, looseleaf. I had been storing them carefully until the day I could read them. I just discovered I have 50 more in storage boxes, some of which are IBM issue. I don't know what's on any of them.

In short, I need to find a way to get a keyboard to talk to the Displaywriter. Thanks to the help of Chuck(G) and the rest of the VCFED members I have already built and deployed an XT/AT adapter to translate between my 5160 and Model M keyboard. I think, in principle, the same approach might be employed here. However, there are three potential pitfalls: mechanical interface, electrical interface and signal decoding.

My reason for posting here: If anyone has already accomplished this feat I would very much like to hear details of how you did so. In the mean time, I'm getting closer to being able to image the IBM disks. When I have done so I will put the images on Google Drive and post again.

-CH-
 
Hello, clh333,

I'm trying to do something perpendicular to yours: I want to use the Display Writer's monitor as IBM 5151. I've already soldered the connector to my ATI Graphics Solution rev. 3 and to a power connector on the mother board. Unfortunately, it doesn't work, and I even can't say, that the reason is the display itself, because I don't know how to test it. From the other side, I could see some not synchronized unfocused weak raster image on the screen, so at least some part of the monitor works. I read you tried to use IBM 5151 together with your Display Writer, or I'm wrong?
 
Originally I had thought to have acquired about 10 disks of programs and data, looseleaf. I had been storing them carefully until the day I could read them. I just discovered I have 50 more in storage boxes, some of which are IBM issue. I don't know what's on any of them.

Would you please send the IBM original disks to Chuck Guzis for imaging?
Original software is difficult to find, and it would be best not to risk these on unknown hardware.
Either that, or at least send a list of what is on their labels so we can tell if the software has already been read.
 
Hello, clh333,

I'm trying to do something perpendicular to yours: I want to use the Display Writer's monitor as IBM 5151. I've already soldered the connector to my ATI Graphics Solution rev. 3 and to a power connector on the mother board. Unfortunately, it doesn't work, and I even can't say, that the reason is the display itself, because I don't know how to test it. From the other side, I could see some not synchronized unfocused weak raster image on the screen, so at least some part of the monitor works. I read you tried to use IBM 5151 together with your Display Writer, or I'm wrong?

Apparently, I fixed the issue. The problem was with the video card, it wasn't properly initialized either with int 10h or MS-DOS mode mono command. I wrote a small assembler test program to manipulate directly the 0x03B? ports and now it works, except only the fact the first two columns are mirrored and few times wider (maybe this is just a software bug). So, sorry for the disturbance, I will probably write a separate thread about the screen.
 
Apparently, I fixed the issue. The problem was with the video card, it wasn't properly initialized either with int 10h or MS-DOS mode mono command. I wrote a small assembler test program to manipulate directly the 0x03B? ports and now it works, except only the fact the first two columns are mirrored and few times wider (maybe this is just a software bug). So, sorry for the disturbance, I will probably write a separate thread about the screen.

I'm glad you have made progress with your issue. It wasn't clear from your post which motherboard you were working with; an IBM 5150 / 5160 perhaps? If so there are switches that must be set depending on the display card and color depth you employ.

I don't know anything about interfacing the Displaywriter CRT to a PC; I've never tried that. I have a 5151 that I use with a 5160 and a 5170 (XT and AT). I also have a Displaywriter monitor which is dedicated for use with the Displaywriter but alas it has never been "lit" in my time of possession. I remain hopeful**, however.

Good luck.

-CH-

** "Hope makes a good breakfast, but a poor supper."
 
Thanks! I don't think the Asynchronous Communications package has been archived.

I looked in my notes and I seem to have recorded that I have the diskette but it is not marked as imaged:

5608-SR1 Jun-1984 Displaywriter ASYNC "Asynchronous Communications Program"

I will go looking for the diskette, I must have been delinquent when I was doing the last round of imaging.
 
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