Z88 Developers' Notes
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Quick Reference to Blink Gate-Array Registers
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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