Table of Contents
We are getting closer now to a finished product. A new revision with some smaller changes and a few more elaborate.
Will this be the last one?
The smaller ones
Some pin swapping on the GreenPAK for better routing and to avoid an external pull-up. All pins EXCEPT GPIO0 has both pull-up and pull-down selectable. GPIO0 only have a pull-down. Since this was a select pin (IO#3) after the DIP switch which means it can float, we needed a pull-up. So I rearranged and moved RESET (which is open collector anyway wired or and with pull-up of 4.7k on the motherboard anyway) to GPIO0.
Changed the outline to even more optimize maximum size.
Larger and slotted holes for mechanical stability.
DIP Switch
In the beginning I treated BLK1, 2 and 3 as one block. The same was true for IO#2 and 3.
Now all these have individual enable/disable. The only select signal treated as a vlock is the lower 3k at $0400 - $0FFF.
Changed RESET switch
I changed the simple tactile 6mm x 6mm switch to one from Well Bying with a red LED. This LED will show the status of the write protect for BLK5.
Constant RED light for when the write protect is through the DIP switch.
Slowly fading in/out when the write protect is temporarely from a long press on reset.
I also doubled the reset switch to cater for 2 different mechanics. Now the board fits in standard Commodore cartridge cases, and all DIY/3D printed versions, including the Swedish Handic brand. But also in my own cartridge case.
Of course only one will be mounted.
Both TSOP-I 32 and sTSOP 32 Memories fit
Both the sTSOP (short TSOP) formfactor and the old TSOP-I formfactor now fits the board. Some of the TSOP-I can be purchased, surplus stock, for down to 0.35 USD in volume. Really really cheap.
