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Fascinating! That would explain a lot about the number of comparitors adding to 18 bits etc. Al's schematic shows the internals of the H27 to have the same ROM numbering scheme as the parallel board. I haven't opened it yet, and I likely will this week(possibly later today). Hopefully it doesn't...

I guess I never got to this part of the text? I'll post a pic of the disk "controller". I put that in quotations because all the control past the parallel looks to be done by the drive itself. It is an intelligent peripheral. Most of the disk control is done on the actual disk drive, which has...

Well, now that you mention it..and I KNEW I should have taken photos of the memory boards...Why didnt I?! lol. Okay Ill do that now. The components on the board are principally 4116 DRAM, however, not all of the 4116 IC slots are populated. It appears to be half populated. The actual trace layer...

Here are the images of the CPU card and all three serial cards. I also took a shot of the underside of the hand soldered one. you can see that he didn't remove the flux when he was done :D. You can see pins 34-39 of the 6402 are connected to hardwired jumpers.

I thought I would start a thread on OC/LA, as it seems there are a number of retro computists/computer hobbyists in the area. It is also an area with a apparently a number of user groups for commodore in particular. To get the ball rolling I'll say a bit about myself. I am a 33 year old "ditch...