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We noticed that the two 16FDC boards that we have are different PCB revisions. On one IC47 is a 74LS30 and on the other it is a 74LS133. The one with the 74LS30 matches the schematics that we have found. The one with the 74LS133 does not match any schematics that Google found. This one also has...

One set for me.

Could it be done on a single board?

You can mix RK05 and Diablo 31 disks on a DEC controller as long as the RK05 drives are closest to the controller. The Diablo doesn't supply one signal that the RK05 does. I think that the missing signal is Power OK or something like that.

After putting some Mylar tape on pins 20 & 70 on the Cromemco 16FDC Floppy Controller, the rest of the boards, Cromemco ZPU, the Memory Merchants 64k (upper 4k disabled) Static RAM, and IMSAI front panel are all working OK. We can't read data from the RDOS ROM on the 16FDC board at 0xC000. We...

Very nice. Time to make a PDP-12 diag pack image and run all of the diags.

Unfortunately the Spacewar! source code that we moved onto the physical RK05 was mangled in the process. This time we used Kyle's Serial Disk and Vincent's OS/8 image manipulation tools to move the Spacewar! source code to the physical RK05 on the PDP-12. The modified Spacewar! has LINC code for...

When using serial disk, what happens to the disk image made by mkdsk if I add files? Will serial disk increase the size of the disk image? If not, then it might be a good idea for mkdsk to make the RK05 images 3248kB. Your os8dir program only saw one unit on the disk image created by mkdsk, but...

I have a Motorola CDROM somewhere that contains 88k programs. There are probably images of the CDROM on the Internet.

We need to thank Vincent and Kyle for making these tools available.

I installed Perl on my Windows laptop, and then Vince's tools. A readme file or help within the Perl file would be nice to have. I ran the os8explode tool and it created two directories, one for each unit on the OS/8 RK05 disk image, and an XML file that describes the structure of the disk. I...

I believe that the CM-2s are on the way to New Zealand.

I bought a giant bag full of them from a surplus dealer. I will see which one have.

Thanks for all of the suggestions. I will give them a try on Saturday. It sure would be simpler if I could figure out how to transfer files with Kermit12.

I thought about that, but right now the reader-run signal on the PDP-12 isn't working correctly so there is no hardware flow control. On the PDP-9 the source files are not just text, they are an editor file. I didn't know if that was also true with the PDP-8. I have KERMIT12 on the PDP-12 and a...

I have the source code for Spacewar! for the PDP-12. It has been modified by several people to fix bugs, and the RICM modified it to use PDP-1 style game controllers that we made. I assembled it with PALBART on my laptop and used the RIM loader to load it into the PDP-12. That works OK. I used...

The same connector plugs directly into the back of a DEC VT220 terminal.

I fiddled with different memory addresses and found that the first 2k of memory was misbehaving and the upper 2k if the first field was OK. The second 4k field also was OK. The G221 boards decode the memory address to drive core memory signals. I swapped the G221 in slot C07 with a repaired...

We use the standard DEC 8-pin Molex connector for everything that is current-loop. There is a version that rivets to the PCB.

Is there a serial eprom on the board that holds data like serial number, etc?