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omti8621: Reimplement FDC rate selection

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This commit is contained in:
AJR 2020-09-26 13:19:47 -04:00
parent 2baeac95fc
commit ac99753eb6
1 changed files with 5 additions and 2 deletions
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7
src/devices/bus/isa/omti8621.cpp
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@ -1342,8 +1342,11 @@ void omti8621_device::fd_moten_w(uint8_t data)
void omti8621_device::fd_rate_w(uint8_t data)
{
// Bit 1 = FD_MINI (TODO)
// Bit 0 = FD_RATE (TODO)
// Bit 1 = FD_MINI (connects to pin 3 of FDC9239)
// Bit 0 = FD_RATE (inverted output connects to pin 4 of 74F163)
u32 fdc_clk = (48_MHz_XTAL / (BIT(data, 0) ? 5 : 3) / (BIT(data, 1) ? 4 : 2)).value();
m_fdc->set_unscaled_clock(fdc_clk);
m_fdc->set_rate(fdc_clk / 16);
}
void omti8621_device::fd_extra_w(uint8_t data)