I built the machine this year. Tested expanded C64C, motherboard 250469 rev B, the last version.
Expansions:
Switchable 4 kernal ROM in new M27C512 64 KB EPROM (in socket).
Bank 1 normal 251913-01.
Bank 2 Exos 3. Info.
Bank 3 Datel turbo ROM II 3.2+. Info.
Bank 4 Turbo tape. Direct load turbo 250 type programs, and datasette head alignment program. Info.
The 2 switches = 4 combination: Down+down = bank 1, down+up = bank 2, up+down = bank 3, up+up = bank 4.
S-video output with 300 Ohm resistor to chroma signal. Info.
SID audio out RCA (8580).
SID audio in RCA. It is possible to make an external audio signal connect (SID pin 26, ext in). The sound of the machine 1 (audio source) is modifiable according to pleasure with the machine 2. I tested an other C64 audio signal. It is possible to connect more SID chips (daisy chain). There is need for a SID protection circuit, if you use an other external sound source (radio, CD player, etc.).
Full reset button = C64 switch on reset, reset all connected devices.
C64 + expansion slot card only reset button. Reset without connected devices (floppy drives, etc.).
Digi fix switch with 330 kOhm resistor. The digi musics will be louder. Info.
IRQ switch. The system IRQ line switch to GND. The programs stop, the IRQ routines (music, etc.) speed up.
Socketed U8 252535 system controller.
70 USD. Shipping cost to Europe 27 USD, to USA 30 USD, priority registered letter. Paypal gift only.
Expansions:
Switchable 4 kernal ROM in new M27C512 64 KB EPROM (in socket).
Bank 1 normal 251913-01.
Bank 2 Exos 3. Info.
Bank 3 Datel turbo ROM II 3.2+. Info.
Bank 4 Turbo tape. Direct load turbo 250 type programs, and datasette head alignment program. Info.
The 2 switches = 4 combination: Down+down = bank 1, down+up = bank 2, up+down = bank 3, up+up = bank 4.
S-video output with 300 Ohm resistor to chroma signal. Info.
SID audio out RCA (8580).
SID audio in RCA. It is possible to make an external audio signal connect (SID pin 26, ext in). The sound of the machine 1 (audio source) is modifiable according to pleasure with the machine 2. I tested an other C64 audio signal. It is possible to connect more SID chips (daisy chain). There is need for a SID protection circuit, if you use an other external sound source (radio, CD player, etc.).
Full reset button = C64 switch on reset, reset all connected devices.
C64 + expansion slot card only reset button. Reset without connected devices (floppy drives, etc.).
Digi fix switch with 330 kOhm resistor. The digi musics will be louder. Info.
IRQ switch. The system IRQ line switch to GND. The programs stop, the IRQ routines (music, etc.) speed up.
Socketed U8 252535 system controller.
70 USD. Shipping cost to Europe 27 USD, to USA 30 USD, priority registered letter. Paypal gift only.
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