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Help with a DIY FreHD

VCFed about 2 months ago

I've build a FreHD and trying to connect it to my TRS-80 Model 1, but it's not working. Can someone with a working FreHD help? I'm made both, the FreHD and the Model 1 adapter. If you connect your FreHD to a power 5v power supply with the …
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Feature: Meet The Company Bringing Classic Games To Switch, PS5 And Xbox "By Mistake"

Time Extension about 2 months ago

"We reached out to Sony to start an experiment".Robin Lavallée has been in the game industry for a long time but traces his love for gaming back to when his father bought him a TRS-80 computer when he was nine."I started programming and never stopped,” …

TRS-80 Model 4 Non Gate floppy write problem

VCFed about 2 months ago

HI all, I have a Problem with my Model4 where it won't write disks. It reads just fine. I have swapped all the socketed chips and no help. Also tried different drives also no help. Any ideas? Larry any ideas. …

Gotek Troubles on Model III

VCFed about 3 months ago

I am running the latest Flash Floppy on a Gotek with Artery AT32F-415CBT17 on a TRS-80 Model III with 48k RAM. The Gotek is connected with the proper cable type from the Gotek to the external floppy edge connector. Drive 1's internal cable is disconnected …
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Tandy RS-232C Interface Board: Offers

VCFed about 3 months ago

I have a Tandy 8709134-A RS-232C Interface Board from a TRS-80 Model III and also an adaptor board (1700369-A / 8709826) that is probably from the Model III but not sure that I will throw in. I am open to offers (+ shipping) …

Looking for FDC timing chip or substitute for TRS-80 model 4 Gate Array

VCFed about 3 months ago

I'm in the processes of restoring a TRS-80 model 4 gate array and have located one of the problems causing the system to hang at startup and only show garbage on the screen. The FDC timing chips is dead and sends a hold signal to the CPU which was also bad …

Hello from Southern California

VCFed about 3 months ago

I'm 54 and just started buying the first computers in my life out of nostalgia, now I can't stop. The first computer I owned was a VIC20 and the first computer I used in school was a TRS-80 Model 3. I enjoy kit building and repairing more than using but it …

ADT-Pro like programs for TRS-80??

VCFed about 3 months ago

Hi all: So I recently finished up refurbishing a Model III with upgraded memory. I would like to start getting some disk images written from my PC to actual floppies. I know there are a multitude of ways to do this, however, I am at a disadvantage as I do …

TRS-80 Model 3 - (no floppy drives on system - 16K) Strange boot screen

VCFed about 3 months ago

I just repaired a TRS-80 Model 3 that I bought on OFFERUP, that was delivered with a broken CRT. I installed a new CRT, and things seemed to be fine, expect it boots up with a strange screen that I can not find anywhere on the internet. Really, I have lo …

TRS-80 model 4 video problem.

VCFed about 3 months ago

I was given a Model 4 which keeps blowing the video board fuse. I was told that something "shorted" in the power supply (who knows?). The power supply fuse does not blow, and if you disconnect the PS and give it AC, the output voltages look ok. I …
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TRS-80 Model II and External 3-floppy unit

VCFed about 3 months ago

Guys, I have a non-working (2 years ago did work) TRS-80 Model II and an external 8" 3-floppy expansion unit that I would like to give away for free. I also have a box of 8" floppy disks. I would like to see these units in working condition a …

Any tips for a TRS-80 CoCo with a few dead keys on the "chiclet" keyboard?

VCFed about 3 months ago

After a lucky thrift shop find a while back, I've got a beautiful TRS-80 Color Computer Model 1 in my collection. I had one just like this as a kid back in the early '90s, so this is a very happy and nostalgic machine for me, in spite of (or maybe because …

TXT file to a tokenised BAS file

VCFed about 3 months ago

Having scanned in 6 pages of fine text Basic listing and then OCR'ing it and converting all the 0 to O and l (small L) to 1, etc. how can I convert it to a tokenized BAS file that loads and runs. Google hasnt been my friend finding a solution. Any help ap …

TRS-80 Model 1 - Display problem (Hoizontal Sync)

VCFed about 3 months ago

Hello After reading a little on this forum I decided to dig out my old TRS-80 Model 1 to see if it stll works. As you'll see in the photo, it boots and runs BASIC code. However the display is distorted. The vertical is very stable and I can adjust it …
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TRS-80 PT-210 Data Terminal - keyboard repair, ROM dump, RS-232 board reproduction ... ROM hacking?

VCFed about 3 months ago

Well, I did it, I got my hands on a PT-210 of my own. First thing I did was tear into it and check for problems. Robust power supply, looks to be linear - no potential problems there I can see. Paper was old and gnarly, but that's an easy fix with a sto …

Other Computer / System Cores • TRS-80 Model 1 - Microsoft Adventure

MISTerFPGA about 4 months ago

I've been interacting with the individual who cracked the very first commercial copy-protected title, Microsoft Adventure, for some time now. (See https://www.filfre.net/2011... and a great many other writings for details).After all …
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Model 1 Help

VCFed about 4 months ago

Get this when first power up Get this when I hit reset Thanks for the help Trs-80 Model 1 …

Trs-80 model 1 -5v

VCFed about 4 months ago

the -5v mine is reading -5.22 volts? Could this cook the ram? Could this be a defective zener? Am exsperiencing burn finger ram chips? Thanks Joe …
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Exidy Sorcerer Floppy Disk Controller (Dreamdisk) Replica PCB

VCFed about 4 months ago

We have successfully designed, built and tested a replica of the Sorcerer Dreamdisk FDC here in Australia. It based around a WD2793 FDC chip. It booted successfully from a Gotek using an 80 Track DS/DD 720K .DSK Image. The DreamBIOS CPM 2.2 uses ZCPR 1.6 …

TRS-80 Model 1 with pound characters at top of screen

VCFed about 4 months ago

Hello all. I just acquired a TRS-80 Model 1 with Expansion Interface. I noticed it's showing pound symbols in the first three lines. I can hit return and program BASIC without any problems, but the characters at the top stay in place (not scrolling out of …
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TRS-80 Trash Talk Live #37 is Saturday January 20th at 5pm EST

VCFed about 4 months ago

Come join your friends from around the world as we discuss the latest topics in the TRS-80 and Tandy vintage computing community. DM me for an invitation to the Zoom meeting. If you have not yet joined us on Zoom, please do as it's much more fun to inter …

Can Turbo Pascal 3 compile to other than 100h ?

VCFed about 4 months ago

There is available a CP/M version for a TRS-80 Model 1 (and my System 80 clone) but because of its roms, low memory starts at 4200h and the programs load at 4300h. So off the shelf CP/M programs dont work. I have the Turbo Pascal source code for the game …

How does audio on the TRS-80 Model 1 work?

VCFed about 4 months ago

Good evening all, I'm trying to figure out how audio works on the TRS 80 Model 1 from a software perspective. I don't have a model 1, but I'd like to understand the theory behind generating tones via the cassette port so that I may apply the same method …

Misc For Sale TRS-80, Mac, Etc.

VCFed about 4 months ago

I'm trying to tidy up my computer room, and would like for this stuff to go. A few items I've tried to sell here before (can't figure out how to edit or delete prior posts?), and some are new to here. I'll send pics on request, but I'm guessing there's not …

CE-158X, a more modern replacement for the Sharp CE-158 (and TRS-80 version)

VCFed about 4 months ago

For months a friend and I have been working on a replacement for the Sharp CE-158 RS-232 serial/parallel interface for the PC-1500 (TRS-80 PC-2). I just put the finishing touches on the enclosure, PCB are on hand and parts will be arriving next week. Note …