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It has been a long while, since I had, what I believe is the same problem. So, my memory may be faded. However, I believe that there are only 2 Video Ram chips on board, and one is not really used. At least not in the boot process. If I am remembering correctly, all I did was swap the two video...

I would like to git a look at your 6532 replacement board, as I could probably use two of them, if I can make them fit. The Corsham board, is too wide to repace both 6530's.

I have just uploaded a new video. Showing the now working KIM-1. I also placed the bad 6530-002 in the 6530-003 socket, so that we could take a look at it. I have to mention that I would never have been able to get this system to boot up again, without the Corsham RRIOT replacement board.

Everything is ticked under Preferences and under account details email options and I have verified that the correct email address is in place.

Well, I placed the 6530-002 in the 6530-003 socket, to take a look at the ROM and it looks the same as it did on my bread board project. Good code repeating itself every 8 bytes, and there by replacing the code that should be there. I was thinking there might have been a wiring problem, with my...

Hey GravityCrab How goes your vintage computer collection??? Mine has grow quite a bit in the last 3 years. I am here in Palm Coast FL. So, it might be nice to meetup online or in person. You can find me on Youtube as well. Jeff Nay

I was just wondering... Since we know the 6530-003 is also bad. In fact scrambled up pretty good. I was wondering if I could place the bad 6530-002 in it's place, to make it easy to take another look at it. To verify that my bread board project did show me the correct information? Of course this...

That sounds pretty messy... I am guessing at least 2 or 3 stacked sockets and two big Corsham boards stacked on top of each other. So much for being a single board computer, now it is a multi board computer... LOL!!! I guess, I am just going to have to be happy that this old KIM-1 is booting up...

Well, I just re-inserted the 6530-003 and it appears that it was damaged as well. No surprise here... Not sure how I can replace both 6530's at the same time??? The Corsham board only allows you to replace one or the other, as far as I understand.

Well, I just re-inserted the 6530-003 and it appears that it was damaged as well. No surprise here... Not sure how I can replace both 6530's at the same time??? The Corsham board only allows you to replace one or the other, as far as I understand.

After only having to replace the 6502 CPU, the 6530-002, all 8 - 2102 memory chips and the U17 7406 Inverter. This old KIM-1 is working again !!! Thank you for all your help and support.

I was able to take a look at the failed 6530-002 by building a breadboard and connecting it to my working KIM-1 and addressing it, using K2 and K4. I saw the ROM starting at $1000 and the I/O starting at $0B40 I noticed that the ROM was repeating good code every 8 bytes, thereby constantly...

I really would have liked using your Diag board on this KIM-1 as it had multiple failures. I am currently in the process of removing all the ram chips and installing sockets. I am of course assuming, from what I have seen while piggy backing, that this may resolve the remaining problems that I...

I have just uploaded a video to my Youtube channel that shows what good signals look like as well as what I am seeing on the board that I am trying to repair. At the very end of this video I was able to get all the displays to light up temporarily. Which is pointing to the fact, that, at this...

This board probably suffers from multiple failures. I purchased a Corsham 6530-002 replacement board which corrected the signals that I was seeing at U4 74145 decoder. I am now seeing the left most display lighting up. However the U24 74145 does not seem to be receiving the correct input signals...

Hey Dwight, I have an old KIM-1 that looks like it has multiple failures. It must have taken a pretty big shot, when it failed. I have replaced the failed 6530-002 with a Corsham 6532 replacement board. That did help, start to light up one segment with a small c. I piggy backed all the memory...

Hey Dave, I know you posted this a long time ago, but I could use your help. My KIM-1 just stopped working. Like you I have checked all the obvious voltages and the Clock is working and I probed pin 40 as I pressed RS, to see that pin go low. I looked at the two 74145s everything looks pretty...

Hey Guys, I have been enjoying working with my ia7301 computer in a book, but I have run into a slight problem. Chapter 7 is about writing and reading tapes, and I am not having any luck with this right now. It may be the PS I am using, where it supplies the +5VDC needed, I am not sure it will...

I did not receive an email notification, so I just took a look at this message online. I had a friend, send me a pic of his recently configured IMS SIO board. So, I am trying to basically understand his configurations, compared to what I am reading in the manual. I can see and partially...

I remember looking over timing diagrams like the ones, on pg 348 and doing my best to follow them, so I will look them over again, however as a newb I will be starting on pg 339 to get some basic information first. Although it will of course be helpful to have a good knowledge of the internal...