mbbrutman, thank you for your reply. First of all i want to really thank you for the great work you've done on mTCP. It's an amazing collection of software that works right out of the box with minimum configuration. Thank you! The main reason for ZModem really is that there are BBS'es out there that …

Note that this forum is about "Getting old DOS games working on modern hardware" as per the description. For old hardware ask in Marvin -- https://www.vogons.org/viewforum.php?f=60 Oh sorry. I did read it and i somehow understood it includes other software than games as well. Can it be moved …

Hi, I'm in a search for ultimate dos terminal application to use on my dos machines. I would like it to support serial communication and also packet drivers and telnet support. I would also like it to support all kinds of file transfer protocols like xmodem, ymodem and zmodem. The mTCP collection …

That's a standard 16bit wide 256Kbit sized DRAM, other DRAMs with such arrangement have same pinout and work same way and are direct substitutes. I've used terms like "256k dram" (and then scanned through datasheets, to get the correct stuff) to find possible options. Is this the best way to do it, …

Hmm, I think i'm missing something right now. Let's take this: http://pdf.datasheetcatalog.com/datasheet/AllianceSemiconductor/mXrqqxt.pdf (Found it in previously described way, going to be upgrades for CL5446 gfx) It doesn't say anything specific about JEDEC standard except packaging... which is …

So, first of all good news: Both COM ports are now working! And even better - i had to change only one 75232 chip... but not for reasons i'm proud of... Lesson nr 1: NEVER USE PICO-PSU TO TEST STUFF. (Yes, it's easy and nice, BUT IT DOESN'T SUPPLY -12V!) When 75232 doesn't get it's negative 12V, …

Hi, Here and there, some videocards, motherboards, soundcards, whatever happens to come by where there are possibilities to add some chips. (usually some type of memory) Now, it's easy to look for the markings of existing chips and try to find additional ones just like that. But what would be the …

Tiido wrote: I got these two for 12€ : Seller photos, I'll not actually get to see them in person until next year. I don't know the model numbers either. Hopefully they are working nicely after a clean ~ Damn it! You were the guy! And i wasn't behind the computer to overbid you... 😜 Grats!

One way to tell is to see if a fat GND trace connects middle of the header (sequential) or edge of the header (staggered). I'm going to remember that probably as long as i live now... Thankfully, when i wasn't (unfortunately) too much interested in giving new lives to computers, i did desolder lots …

I think I'm onto something. I was able to find TX line on 5V side with LED. By juggling with COM port pins, i also confirmed 12V RX side. (Seeing jumbled characters appearing on screen) What seems to be case (and looking by bare eyes, seem to be confirmed by LED), 12V TX is stuck on HIGH state. So …

Suured tänud sulle, Tiido! I'll try it out soon. I have proper hooks available to attach to chips. Should ordinary multimeter be sufficient or should i measure the inputs/outputs in some other way?

Thank you for that information! I wasn't aware of that. This means that i should always try 2 different options to set up a loopback. (pin 2 and 3 connected) Thank you! Unfortunately it didn't give me any results this time. Also tried separate set of 2 com ports i have laying around just to make …

Good day, I have a PC with Acorp 5VIA3P motherboard and i haven't been able to get any serial ports to accept mouse. Then i tried loopback test (with norton commander terminal, i tested it with other computers and it works) and seems that both COM ports are dead. What next? What could i try to trace …

Good day! I've been reading this forum for few years and have accumulated few of computers for my own interest. Now it is time to register to this forum and join you guys. :) For the first topic i have a small problem with my 386 PC. It's a Am386DX40 on a PC CHIPS based motherboard. It had soldered …