[vcf-midatlantic] Bunch of Apple II clones for repair

[Ricardo 8-Bit Desk]

Software development for the whole life (started with the good old ZX81). And electronics/retro fixing on the last 4 years. Still learning😁

Do I need to bring any tools or are we filly equipped there? 

Ricardo. 

Sent from my iPhone

> On Jan 3, 2024, at 2:11 AM, Neil Cherry <ncherry at linuxha.com> wrote:
> 
> On 1/2/24 19:12, Ricardo 8-Bit Desk via vcf-midatlantic wrote:
> 
> Ricardo, not sure of your background, mine is in software and hardware so
> it come a bit more 'natural' to me. It's not natural until one learns
> the details. Good news is that if you ask folks can help.
> 
>> I have no idea what state the computers are. I know for sure they need a good test on their power supply to start with.
> 
> NJ, definitely NJ (yes, bad joke).
> 
>> My knowledge of Apple II is very limited (more of a Commodore person) but I could NOT resist those last time I was in Brazil.
>> I will try to be there around 9-ish on Saturday.
> 
> I won't be there until Sunday, sorry.
> 
>> See you all there!
> 
> Suggestions (some folks may correct them or have much better ideas):
> 
> Check your power first, always. Then a quick check of the CPU clock and see
> if the address are changing (both with an oscilloscope).
> 
> Tied the data buss to $EA (NOP) should step you through each address though
> it will start at $EAEA (I think). I think you use a few resistors on the data
> buss to pull the bits to 1 (1110 1010 - D7 - D0). At the ROM socket would
> probably work okay. Might need to pull the RAM to check this.
> 
> Others will be able to help further at the workshop (and may have diag ROMS
> to help).
> 
> Any Apple II, II+, or clone schematic will probably work okay for figuring
> things out but a bit of guess work will be needed. A quick search of the net
> should help. The operation of the Apple II will be very similar.
> 
> Weird, writing this down is making me think of how to debug my 68HC11 dev
> board. :-)
> 
> --
> Linux Home Automation         Neil Cherry       kd2zrq at linuxha.com
> http://www.linuxha.com/                         Main site
> http://linuxha.blogspot.com/                    My HA Blog
> Author of:        Linux Smart Homes For Dummies   KD2ZRQ
>