I tried the file from Crvs and they are for M380 Xp4. I have been able to set most of the things but not the hard drive. In the list it not appears the right one. Now i will try with the others and see what i can do

Thank you, i try it later and let you know if you saved my life ehehehe

Hello. I have a booting M380 but i need the setup floppy to set boot sequence and other things. Someone can be so kind to send me an image of it? Thank you in advance. Kidrash.

I have to put the project on hold for a bit for 2 main reasons. I don't have any chip to substitute and also they are SOJ and to do a good job i need an hot air gun for proper desoldering. Once i have both i will change the chips one by one and see what happens

I'm not disappeared, but work has been crazy the past days. In this weekend i will try to test the tracks and chips. Unfortunately, there is no info on the board about memory banks. Also i have to find some way to test the chips and i don't know where to find some substitutes. I will keep you …

Thanks everyone for the answers. @Viler: yes, it's 2 64Kb files merged with Winhex, bytewise (8bit). The result it's a 128Kb file. @mkarcher: I followed your suggestion and now i have a more healthy situation. As soon i have created the segments, the function windows populated and the first far jump …

I tried the CMB75's bios. No boot but at least some error beeps. 3 short beeps. According to ami bios, it's the first 64Kb of ram. Now i have to find wich chip is/are and even to find a replacements. Memory chips are labeled 81c4256-80, 8 0f them. I will check all the tracks on the MB and see if …

I'm at work now, i will try this evening to test CMB75's bios. I'm already crossing fingers ehehehehe

Ehmm, what means "CPU is going south"? (Probably i know that but i don't want to ear it) When i heard the sound and checked the manual i felt a bit sad. All this work for probably a faulty CPU? Today i will dig in an old 5160 IBM frankestein pc. IBM's case, powersupply(dead) but unknown 486 …

I'm trying the diagnostic. At screen i see nothing but the speaker works. Tick tick tick tick, very low volume but quick and long time. Then it makes high and low beep, 1 each still for a long time. The low beep, with a little pause for another long time. The 1 high, 1 low, 1 short. And falls …

I will try with some W27E257-12 i have around, but i don't understand how it can work with a smaller rom. The CPU reads FFFO (1111111111110000). The chip set set right pins to HIGH but since the rom is smaller, the pin 15 don't count? How it's the address sent to the Rom? A15 to A4 = 1 and A3 to A0 …

Ok, i will keep posting just here. I have extracted the chips some day ago, compared with the files found on the website and they match. I can test it again just to be sure nothing changed it the meanwhile. I will order a couple of new 27c512 (uv erasable)cause i have no spares and then i will test …

Hello, i'm trying to understand how a bios parted in 2 chips is used by the CPU. I'm trying to disassembly a bios to understand some post codes sent to the LPT1 (Olivetti M290S does that) but i'm having troubles wit IDA. First, let's say i know nothing about disassembly, machine code and such but …

After a good suggestion, i connected the logic analizer to the parallel port as this machine has a prescreen post and i grabbed some data. 0.205887750,(129)(0x81) 0.205937300,(131)(0x83) 0.205965600,(133)(0x85) 0.359668550,(135)(0x87) 0.523224100,(137)(0x89) 0.574552100,(139)(0x8B) 0.616640950,(141 …

For sure i will check again the PG again and all the voltages. I will do a custom connector and test with a different psu. So if i get data on the Rom address lines means that the board does something and the reset goes down. I will check again with the logic probe and the logic analyzer. Yesterday …

Hello again, i'm still trying to find why the motherboard don't boot up so i started to follow better the tracks on the board. I have found that the output of the 2 roms is splitted at least in two. One lane goes to the pins on the chipset near TACT 82301PB the processor and the other lane goes to a …

Greetings to everyone. I'm having troubles resurrecting an Olivetti M290s with motherboard M203. It simply not boot up, nothing on screen, no beeps. The powersupply was in bad shape, capacitors leaked so the whole power board has been cleaned, neutralized and the capacitors replaced. Now the …