Verilog definitions of custom SNK NeoGeo chips, for repairs and preservation.
Details can be found at https://wiki.neogeodev.org/index.php?title=Category:Chips
It seems only Lattice ispMACH4000 devices are 5V-tolerant, small enough and have enough I/Os.
| Chip name | CPLD | Cells used | Board done | Tested |
|---|---|---|---|---|
| PCM | LC4128ZE | 70% ##############------ |
Nope | Nope |
| NEO-257 | LC4064ZE | 25% #####--------------- |
Nope | Nope |
| NEO-273 | LC4064ZE | 59% ############-------- |
Nope | Nope |
| NEO-D0 | LC4064ZE | 62% ############-------- |
Nope | Nope |
| NEO-G0 | XC9572XL | 71% ##############------ |
Nope | Nope |
| NEO-ZMC2 | XC9572XL | Todo | Nope | Nope |
See [chip name].v for notes about each chip.