+- 99er Forums (http://www.99er.net/99erbbs)
+-- Forum: TI-99/4A & Related Computers (http://www.99er.net/99erbbs/forumdisplay.php?fid=4)
+--- Forum: Hardware (http://www.99er.net/99erbbs/forumdisplay.php?fid=5)
+--- Thread: Original Horizons Ramdisk Modifications (/showthread.php?tid=6)
Original Horizons Ramdisk Modifications - sjt99 - 04-18-2014
I recently revived a Horizons Ramdisk and noticed there were a few changes made to it that I didn't have on my original HRD.
After much searching, I found the document detailing when these changes were made. I was curious because I recently saw a photograph on another forum of the HRD that did not have the Mod's on the card I have.
The sheet attached is a rejuvenated copy of the Bud Mills Mod sheet on the HRD from 1988.
The 2 modifications address the following concerns and issues with the original cards.
The first was to allow the TI computer to reset the card during it's cpu power up.
The second was to make the card invisible to the system by disabling it's CRU by use of a switch located on the card rear edge.
If you have a early Horizons Ramdisk, check to see if you have these modifications.
Steve
P.S. If your reading this and have a spare Horizons Ramdisk, or a friend that does and want to see it be used again by a new owner , working or not, message me.
RE: Original Horizons Ramdisk Modifications - sjt99 - 04-20-2014
(04-18-2014, 09:21 PM)sjt99 Wrote: I recently revived a Horizons Ramdisk and noticed there were a few changes made to it that I didn't have on my original HRD.
After much searching, I found the document detailing when these changes were made. I was curious because I recently saw a photograph on another forum of the HRD that did not have the Mod's on the card I have.
The sheet attached is a rejuvenated copy of the Bud Mills Mod sheet on the HRD from 1988.
The 2 modifications address the following concerns and issues with the original cards.
The first was to allow the TI computer to reset the card during it's cpu power up.
The second was to make the card invisible to the system by disabling it's CRU by use of a switch located on the card rear edge.
If you have a early Horizons Ramdisk, check to see if you have these modifications.
Steve
Additional:
If anyone reading this has the original manual for the Horizon's Ramdisk model 1000 Please upload it here.
So far I have not been able to find it.
RE: Original Horizons Ramdisk Modifications - Ed in SoDak - 05-04-2014
Neat you got it figured out and the mods on yours documented. How well does it work? Back in the day when the TI was my do-it-all system, even taking me on the early internet, I never could swing the cost of a (then) new RAMdisk. Lots of drive action when using Telco or Funnelweb, the sound of the floppy drive head scouting around when loading files is burned into my aural memories, lol.
-Ed
RE: Original Horizons Ramdisk Modifications - sjt99 - 05-05-2014
It works well, and it's fast.
It's fun to have a system up and running again.
RE: Original Horizons Ramdisk Modifications - ksarul - 05-09-2014
I'm pretty sure I have the HRD1000 build manual around here somewhere. As soon as I find it, I'll scan it in and put it up here.
RE: Original Horizons Ramdisk Modifications - sjt99 - 05-13-2014
(05-09-2014, 07:17 PM)ksarul Wrote: I'm pretty sure I have the HRD1000 build manual around here somewhere. As soon as I find it, I'll scan it in and put it up here.
Thanks.
It is not in the archive.