Search results

Got ADTPro working. The IIC Diag isn't that interesting, looks like it needs hardware to be plugged into the ports. The XPS Diag is running now. Looking good so far Its too bad that's not an ESP on the SP2SD. Would be nice to do all this over WiFi instead of sneaker net.

Thanks for the pointers and the sentiments. Will need to get a disk emulator to move forward. I am locked in 1980's hardware at this point. I have a //e, 2x //c, and a IIgs.

I ended up putting sockets in MRD0 - MRD7. My machine has TMS4164-Z20NL. I got 5 of the same off eBay, after seeing the voltage issue on MRD7. Turns out 2 of the 5 "new" ones I bought don't work. I assume one of the broken ones is the one I solder into to MRD7 (sadly didn't mark it)...

I replaced the 4164 because I was seeing some low output voltages on Q. Its possible I wasn't on the pin correctly. Regardless before and after all the three chips I replaced the results on the screen was basically the same. Interestingly I am hearing speaker do a short crack noise (nowhere...

All are high. And TMG 16 is 2.05 Mhz

Looks like I was on the wrong pin for CAS, it is 2.05

14.71 Mhz at the GLU pin 1, 7.25 Mhz at GLU pin 20, 3.57 Mhz at TMG Pin 3, and 1.02 Mhz at PHI2 at the 6502. AFA and CAS/RAS at the 4164, I see RAS strobes at 2.05 Mhz and CAS at 1.02 Mhz.

I see RESB go high at power on and RESB toggle low/high on Control-Reset.

No beep or drive seek. I hooked up a logic analyzer to RWB and RDY on the 65C02, they are both toggling. I also see the address lines and the data lines toggling at the 65C02 as well.

Yes, yes, and yes. Just ordered some deoxit to clean the contacts as well (its not here yet). Thanks for the suggestion.

Hi, I have a Apple //c, board 820-0115-C. I am getting a video signal (see picture), but no boot. I have replaced MRD7 RAM, 80 DIR, Video Latch, tried an alternate CHAR GEN and burned a new MON chip. I have tried my spare CPU, MMU, and IOU chips. Any suggestions of what to try next...