Baffavision TMS9918 Videoboard
TMS9918 video board for Baffa-2.
Baffavision TMS9918
TMS9918 VideoboardSettings
Colecovision Port: B0h-BFh (mirrored at A0h-AFh)Msx Port : 98h-9Bh
| JP1 | ||
|---|---|---|
| =o | 00h-01h (A1|A2) | -----00- |
| o= | 00h-07h (A1|A2) | -----xx- |
| JP2 | ||
| =o | 08h-0Fh (A3) | ----1--- |
| o= | 00h-0Fh (A3) | ----x--- |
| J6 | ||
| |88 | 00h-1Fh (A4) | ---x---- |
| 8|8 | 00h-0Fh (A4) | ---0---- |
| 88| | 10h-1Fh (A4) | ---1---- |
| JP4 | ||
| =o | int | |
| o= | nmi | |
!E1 = JP1
!E2 = JP6
E3 = JP2
| J4 (E3=1 AND !E1=0 AND !E2=0) | ||||
|---|---|---|---|---|
| |8888888 | 00h | 000!!!!x | ||
| 8|888888 | 20h | 001!!!!x | ||
| 88|88888 | 40h | 010!!!!x | ||
| 888|8888 | 60h | 011!!!!x | ||
| 8888|888 | 80h | 100!!!!x | ||
| 88888|88 | A0h | 101!!!!x | ||
| 888888|8 | C0h | 110!!!!x | ||
| 8888888| | E0h | 111!!!!x | ||
| JP7 (Ext) | ||
|---|---|---|
| pin1 | BUSCLK | |
| pin2 | CPUCLK | |
| pin3 | GROMCLK | |
| pin4 | EXTVDP | |
| pin5 | GND | |
Colecovision
VDP I/O Ports
Port BE-BF are used by the internal VDP TMS9918aInternal VDP
Port BE VRAM Data (Read/Write)
Port BF VDP Status Registers (Read Only)
Port BF 2nd Byte b7=0: VRAM Address setup (Write Only)
Port BF 2nd Byte b7=1: VDP Register write (Write Only)
Port BF VDP Status Registers (Read Only)
Port BF 2nd Byte b7=0: VRAM Address setup (Write Only)
Port BF 2nd Byte b7=1: VDP Register write (Write Only)
Ports: A0h-BFh
| JP1 | -----xx- | o= | 00h-07h (A1|A2) |
| JP2 | ----x--- | o= | 00h-0Fh (A3) |
| J6 | ---x---- | |88 | 00h-1Fh (A4) |
| J4 | 88888|88 | 101!!!!x | A0h |
| JP4 | o= | nmi | |
MSX
Port: 98h-9Fh AND !M1
| JP1 | -----xx- | o= | 00h-07h (A1|A2) |
| JP2 | ----1--- | =o | 08h-0Fh (A3) |
| J6 | ---1---- | 88| | 10h-1Fh (A4) |
| J4 | 8888|888 | 100!!!!x | 80h |
| JP4 | =o | int | |