daver2's latest activity

That error screen is main RAM (low bank of 16K). I will have a look at which bit/bits are at fault tomorrow morning. But you should...

Well, if you are having a problem with a video RAM this fault is also a possible problem with video RAM? I would have said the error...

OK, so that fault is back again. Let's put that on a list of things to investigate later. I would now suggest removing the ROMulator...

So the character screen has both lower case and upper case characters displayed, and PETTESTER has passed the video testing. It makes...

Excellent. Can you post a photograph of the PETTESTER screen when it is testing the ROM checksum and keyboard. I don't care where the...

Quick note about the operation of this circuit, it’s a “Power-on Reset” or sometimes referred to as a “Power-Up-Clear and System Reset”...

SH12 (schematic sheet 12) contains the circuit posted in #9. Dave

SH12 is schematic sheet number 12. It may be a typographical error though. What is: 1. The voltage across capacitor C11? 2. The...

And that image indicates a video circuit fault somewhere. Notice the absence of the uppercase letters (and there should be some...

With that setting, no 'standard' external ROMs are used (only internal ROMs). If you install a ROM with a hardware fault, this can mess...

>>> It's like the rom is being intercepted by the romulator? Er, that's the whole point of the ROMulator, unless you switch the ROM...

The table 'should' start at address $E6D1 in the machine. This should be at offset $06D1 into the EDIT ROM. You load the image file for...

Thanks Robin. Let's see how many 'takers' we get. Dave

Fair enough, so this must be for a business keyboard. See http://www.zimmers.net/anonftp/pub/cbm/src/pet/pet_rom4_disassembly.txt And...

And yet the edit-4-80-n-50Hz.4016_to_8016.bin code did not work. Dave