Hey Birt! | TRS 80 Model 100 PG Design RAM @HeyBirt | Uploaded April 2019 | Updated October 2024, 4 hours ago.
In this episode we look at a very innovative RAM expansion module for the TRS-80 Model 100. Unlike the typically internally mounted RAM modules the PG Designs expansion installed from outside via the expansion compartment system buss connector. Space is tight in the compartment and they made the most use of it wrapping the PCB around the ROM socket to gain enough room. Up to 256K of RAM could be installed on the M100 (32K of internal RAM + 224K from this module).
This particular module was sent to me by the owner for repair. It has a broken pin and while the repair is not difficult it is a bit delicate. The biggest challenge was finding the correct replacement pin. Several common machine pin options were considered but in the end a bit of detective work located the correct part.
This video is as much about the process of finding unusual parts as it is the repair itself.
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Help support Hey Birt!
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Links
Tandy.wiki: http://tandy.wiki/PGDesigns
PCB pin used: mouser.com/ProductDetail/575-3121100150000080
PCB Holder: thingiverse.com/thing:39519
Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien soundcloud.com/stevenobrien
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b...
Music provided by Music for Creators youtu.be/ujIMRIJ1JG8
In this episode we look at a very innovative RAM expansion module for the TRS-80 Model 100. Unlike the typically internally mounted RAM modules the PG Designs expansion installed from outside via the expansion compartment system buss connector. Space is tight in the compartment and they made the most use of it wrapping the PCB around the ROM socket to gain enough room. Up to 256K of RAM could be installed on the M100 (32K of internal RAM + 224K from this module).
This particular module was sent to me by the owner for repair. It has a broken pin and while the repair is not difficult it is a bit delicate. The biggest challenge was finding the correct replacement pin. Several common machine pin options were considered but in the end a bit of detective work located the correct part.
This video is as much about the process of finding unusual parts as it is the repair itself.
Please subscribe by clicking on the subscribe button below. Then click the bell icon to be notified when a new video is posted.
Help support Hey Birt!
subscribestar.com/hey-birt
patreon.com/heybirt
Links
Tandy.wiki: http://tandy.wiki/PGDesigns
PCB pin used: mouser.com/ProductDetail/575-3121100150000080
PCB Holder: thingiverse.com/thing:39519
Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien soundcloud.com/stevenobrien
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b...
Music provided by Music for Creators youtu.be/ujIMRIJ1JG8
