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Thanks Hugo, ROM topic is hopefully covered just waiting for the mail. I'd like to pick your delicious brain and/or your reference library for soldering those old phenolic boards. I have a bunch of those, many equal machines but most with intermitted faults sometimes influenced by mechanical...

Well so now it is time to wait 2 weeks... Brexit makes the mail go pffffff....

Well, I guess since a 2716 is what I asked for: I get 16kbit or 2kbyte and the burner will just trunc the second half...

Thanks Dave & Colin, i fetched the 2 bin files. I did notice that Dave's is 2k and Colin's 4k. I assume the part above 2k is ignored anyway by the PET. For the Bitfixer, I just saw a soldering kit and no ICs... I'll just get the ROMs

@Hugo Holden actually agree on all your points. I also dislike recaps and other mutilations. I also avoid solderwork on orignal PCBs. I.E. some frequently broken tantals can be just cut off and left off in 5160 which is an insight i have from -0degrees. On a different note, I do have some...

Ok so a gent from UK can burn the ROM... (actually, why don't you have a webshop, Dave?) To avoid a useless ROM, could you please check the edit ROM number to see if the ROM will work? I have no clue about ROMs, don't even know what file type he needs... Also no assembler compiler on my machine...

PM'd Thanks

yeah i turn the machine on/off between measurements, but it never chirped. yeah if pettester is an option lets go this way. i am not sure if i can bake my own or have someone mail one. thanks for your time. i feel tracing this backwards is too tedious. i just appreciate 5150 post error...

with all those pins i didnt even realize getting two different reads on ub1/9... when measuring i dont have the screen connected so i wouldnt see if suddenly stuff shows up. well at least we seemed to have exactly observed failed and maybe nonfailed states

this is beyond my skill level and masochistic threshold

seems the 10khz is gone and the complicated signal

yes i just tried to redo the measurements from #101 and they are different - intermittent fault ? wtf - these are the measurements now 1 high 2 low 3 1 mhz squarish 4 high 5 low 12 low 13 high 11 1 mhz squarish 9 low 10 high remember there was some variation with power cycle

UB1 was featured in #101 . the image is the pin described as complicated

i do the measuring, you do the thinking

Of course. Feel like remote surgeon. ub1/9 low uc1/2 low

I got + and - reverse obviously btw

1 high 2 10 khz squarish 3 1 mhz squarish 4 high 5 10khz squarish 12 10khz squarish 13 high 11 1 mhz squarish 9 complicated stuff see photo 10 high

1 high 2 low 3 clock 4 high 5 low

UC1/11, UC1/3, UB2/11 and UA2/7 confirmed all 8 mhz

still more jumpers they are hiding everywhere its 40