Michael 'AppleWin Debugger Dev'
2016-07-08 16:28:58 UTC
I eventually want to rebuild a modern ThunderClock Plus so I've started a repository here:
Apple 2 Hardware Disassembly Project: ThunderClock Plus
Right now it has:
1. Parts List (incomplete)
2. Layout (done)
3. Schematics (not started -- a full blown schematic is a long term goal.)
i.e. Here is the layout:
(Sorry, I haven't spent much time optimizing the Layout down to 74 columns.)
| B2 B1 C8 SW1 ThunderClock Plus |
|R12 R13 Q4 Y1 C7 C4 Q1 |
| D2 1990C CD4050 74LS174 74LS08 74LS132 R1 |A
| Q3 Q2 R3 R2 |
| R4 |
| R11 R7 R5 Sw2 |
| D1 74LS74 74LS109 74LS126 2708 C3 74LS27 |B
| R10 R9 R8 R6 C2 |
| C6 C5 C1 CX |
A couple of questions remain:
What is Y1 ?
What is CX ?
What is D1 ?
What is D2 ?
What is Q2 ?
What is Q4 ?
Does anyone have pictures of their ThunderClock Plus to help clarify?
There was this thread back in 2004:
America and Canada (was Re: Installing Panther on B/W G3)
I've tried cleaning mine up with IPA (No, not the beer but IsoPropyl Alcohol :-) and have gotten some of the green corrosion around 74LS109 and 74LS126 cleaned up but I'm still uneasy doing a "smoke test" until I know:
* is the corrosion safe? (I'm concerned about shorting out the pins.)
* is CX is required?