You plug sequencer(1) on z80 clock and not(sequencer(1)) on VGA...but another problem appears: VGA uses 25MHz speed for scanning RAM. So Z80 has to use same speed xD
To solve this problem you can use a special RAM done for this problem, a RAM that you can WRITE at a certain speed, and READ at another speed, this magic component is called '''ramb16_s16_s16'''. Note that they have no problem to write simultaneously on two RAM components, so that you can dump video RAM content using starter kit's external RAM, and you can display VGA using FPGA 's internal '''ramb16_s16_s16''' RAM.
[[File:build_your_own_z80_amstrad_computer.jpg]]