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I/O port WRITE READ
$70 PB0, pixel base reg.0 -
$71 PB1, pixel base reg.1 -
$72 PB2, pixel base reg.2 -
$73 PB3, pixel base reg.3 -
$74 SBR, screen base reg. -
$B0 COM, command register -
$B1 INT, mask & control STA, interrupt status
$B2 - KBD, keyboard
$B3 EPR, EPROM programming -
$B4 TACK, RTC ack. -
$B5 TMK, RTC int. mask TSTA, RTC int. status
$B6 ACK, main int. mask -
$D0 SR0, segment reg. 0 TIM0, RTC 5ms counter
$D1 SR1, segment reg. 1 TIM1, RTC seconds counter (6 bits)
$D2 SR2, segment reg. 2 TIM2, RTC minutes counter
$D3 SR3, segment reg. 3 TIM3, RTC minutes/256 counter
$D4 - TIM4, RTC minutes/64K counter (5 bits)
$E0 - RXD, UART receive data register
$E1 - RXE, extended receiver data
$E2 RXC, receiver control -
$E3 TXD, transmit data -
$E4 TXC, transmit control -
$E5 UMK, UART int. mask UIT, UART int. status
$E6 UAK, UART int. mask -
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