majiayu000 Mouse Expert - Kolobok Bus Mouse
Expert knowledge for the ES-1841's bus mouse.
Key Specifications
| Property | Value |
|---|---|
| Type | Bus mouse (not serial) |
| I/O Ports | 23Ch-23Fh |
| IRQ | 2, 3, 4, or 5 |
| Protocol | MS Bus Mouse or InPort |
I/O Ports
| Port | Function |
|---|---|
23Ch |
Data port |
23Dh |
Signature |
23Eh |
Control port |
Microsoft Bus Mouse Protocol
Control Port:
- Bits 0-1: Counter select
- Bit 2: IRQ enable
Reading (4 reads for X/Y):
Select X-low → Read nibble
Select X-high → Read nibble → Combine
Select Y-low → Read nibble
Select Y-high → Read nibble → Combine
InPort Protocol (Alternative)
Indexed access:
- Write index to
23Ch - Read/write data at
23Dh
| Index | Register |
|---|---|
| 0 | Status |
| 1 | X movement |
| 2 | Y movement |
| 7 | Mode |
Status (Index 0):
- Bit 0: Left button (0=down)
- Bit 1: Middle button
- Bit 2: Right button
- Bit 6: Movement flag
Implementation Notes
Limited ES-1841 documentation exists:
- Try MS Bus Mouse first
- Check MAME ec1841 for reference
References
See references/ for detailed documentation.