jmellidg
Experienced Member
Great!! Thank you!!
That's starting to sound like some fundamental breakage, like the CPU is dead. If the memtest.bin ROM image does not do anything, that tends to point to something other than DRAM. Could be something like bus (address, data, control) driver chips, too, such that the CPU is unable to communication with the rest of the hardware. The garbage on the screen simply means that the CPU could not run the ROM code in order to clear the screen - the garbage is just the random power-on pattern for the video RAM chips. Note that the memtest and monitor ROM images do NOT clear the screen automatically, so you will still see garbage (until you clear it using monitor commands).Hi, I'm completely stuck. Right now, each time I start up the computer, just fill the video area with garbage. I've checked the connections with the diagram and it seems all Ok. I think that it must be a chip failure. If I try Durgadas's monitor eprom there were no signs, even with just the memory eprom, in the first screen characters.
What do you think about the main chips responsible of the start up process?? Thank you for your help
That's starting to sound like some fundamental breakage, like the CPU is dead. If the memtest.bin ROM image does not do anything, that tends to point to something other than DRAM. Could be something like bus (address, data, control) driver chips, too, such that the CPU is unable to communication with the rest of the hardware. The garbage on the screen simply means that the CPU could not run the ROM code in order to clear the screen - the garbage is just the random power-on pattern for the video RAM chips. Note that the memtest and monitor ROM images do NOT clear the screen automatically, so you will still see garbage (until you clear it using monitor commands).Hi, I'm completely stuck. Right now, each time I start up the computer, just fill the video area with garbage. I've checked the connections with the diagram and it seems all Ok. I think that it must be a chip failure. If I try Durgadas's monitor eprom there were no signs, even with just the memory eprom, in the first screen characters.
What do you think about the main chips responsible of the start up process?? Thank you for your help
That's starting to sound like some fundamental breakage, like the CPU is dead. If the memtest.bin ROM image does not do anything, that tends to point to something other than DRAM.
That's starting to sound like some fundamental breakage, like the CPU is dead. If the memtest.bin ROM image does not do anything, that tends to point to something other than DRAM.