Loading project Things
Solution for multisync switch for Atari ST/STE.
Loading README and project media…
Added a AG-pad (AG after the guy who requested it) cut trace and connect the other pad to feed h-sync to PB2 instead of v-sync. Updates to firmware is needed.
Please be aware that the PCB is unrouted since different PCB houses has different tolerances and it might mess up the end product.
Plug device into your Atari.
Turn your Atari on.
Press .25-1.999[...] seconds: Switch mode.
Press +2 seconds: store current mode as default at cold boot.
For least amount of wobbliness:
| Part | Value | Device | Package | Description | MF | MPN | OC_FARNELL | OC_NEWARK | PACKAGE | PROD_ID | SUPPLIER |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ATARIOUT | DIN13T | DIN13T | DIN13 | ||||||||
| IC2 | 78L05F | 78L05F | SOT89 | POSITOIV-VOLTAGE REGULATORS | |||||||
| JP1 | PINHD-1X2 | 1X02 | PIN HEADER | ||||||||
| S2 | K2-1823SA | ||||||||||
| TM1-3 | 100R | TRIMPOTTC33X | TC33X | SMT trimmer potentiometer part number TC33X | |||||||
| TS5V330 | V330 | SOIC16N | |||||||||
| U$1 | PJ-320D | Audio jack - 3.5mm TRRS variety - two rings. | CONN-10676 | ||||||||
| U$2 | DB-1001N | DB-1001N | THUMB_POT | Multicomp | |||||||
| U1 | ATTINY85-20SU | ATTINY85-20SU | SOIC127P798X216-8N | 8-bit Microcontroller with In-System Programmable Flash | ATTINY85-20SU | 1455164 | 58M3797 | SOIC-8 | Atmel | ||
| X1 | F15HDVS | HDF15V | SUB-D | unknown | unknown |
| Symptom | Solution |
|---|---|
| Constant switching | Check ATtiny soldering, probably rebooting. +5V and GND are possible offenders. |
| Dark picture. | Check soldering on multiplexer, pin 8 and 16 (GND and VCC). |
| Physical switch not working, software switching works. | Check soldering at ATtiny PB4 and soldering at the tactile switch itself. |
| Niether software or hardware switching works. | Check soldering ATtiny PB3 and multiplexer pin 1. |
| Niether software or hardware switching works, boots in low res. | Did you remember to program your ATtiny? |
| Software switch not working | Check soldering on ATtiny PB2 and V-sync on DIN |
| Hardware switch slow. | Did you set fuses ("Burn bootloader" in Arduino IDE) before programming ATtiny? Processor is probably running in 1MHz. |
| Won't hold saved state, switches to hires after cold boot. | Try upping bootWait, probably some timing issues at boot. A recap of PSU might be in place as well. |