PDP-11 for the UKNC

The UKNC is a russian home computer.

Intended for educational purposes, it's CPUs are a direct copy of the PDP-11 processor.
The UKNC actually uses Two PDP-11 processors, one for the main CPU, one for the 'Peripheral processor'... the CPU runs the main code... the PP handles Keyboard, Disk and graphcis - though the main CPU can directly access 2 of the 3 graphics bitplanes (It can't access all 3





Cpu KM181VM2 (PDP-11 Compatible)
Main: 8mhz    PP: 6.25mhz
Ram Main: 64k    PP: 32k
Vram 2k
Resolution up to 640x288 @ 8 colors
Sprites
Tilemap
Colors 4 (2 bitplane) or 8 (4 bitplane) from a palette of 15
Sound chip


Emulator

UKNC BTL - Best (or only) Emulator for the UKNC

ChibiAkumas Tutorials


Video Ports

Function
From CPU
From PPU
Select Address
177640 177010
Write Plane 0 (Blue)
(impossible) 177012
Write Plane 1 (Green)
176642 177014
Write Plane 2 (Red)
176643 177015



UKNC Color Palette

0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F

UKNC CPU Ports

60 CH0 IN Interrupt Channel 0
64 CH0 OUT Interrupt Channel 0
460 CH1 IN Interrupt Channel 1
464 CH1 OUT Interrupt Channel 1
474 CH2 OUT Interrupt Channel 2
176000 Windows Register
176000 Window A register
176001 Window B register
176640 Bitplanes address register (RA)
176642 Write Plane 1 (Green) (RD)
176643 Write Plane 2 (Red) (RD)
176660 C1 in STATUS Channel 1
176662 C1 in DATA Channel 1
176664 C1 out STATUS Channel 1
176666 C1 out DATA Channel 1
176674 C2 out STATUS Channel 2
176676 C2 out DATA Channel 2
177560 C0 Console in STATUS Channel 0
177562 C0 Console in DATA Channel 0
177564 C0 Console out STATUS Channel 0
177566 C0 Console out DATA Channel 0

UKNC PP Ports
300 Keyboard interrupt vector
304 Programmable timer interrupt
310 External event interrupt
314 ;RESET on CPU bus interrupt
320 CH0 IN Interrupt Channel 0
324 CH0 OUT Interrupt Channel 1
330 CH1 IN Interrupt Channel 1
334 CH1 OUT Interrupt Channel 2
340 CH2 IN Interrupt Channel 2
177010 Bitplanes address register (RA)
177012 Write Plane 0 (Blue) (RD)
177014 Write Plane 1 (Green) (RD)
177015 Write Plane 2 (Red) (RD)
177016 PPU dots color
177020 PPU bitplanes 0/1 background color
177022 PPU bitplanes 1/2 background color
177024 PPU dots octet
177026 PPU bitplanes mask register
177054 Window (100000-117777)
177060 C0 in DATA Channel 0
177062 C1 in DATA Channel 1
177064 C1 in DATA Channel 2
177066 C0 in STATUS Channel 0
177066 C1 in STATUS Channel 1
177066 C2 in STATUS Channel 2
177070 C0 out DATA Channel 0
177072 C1 out DATA Channel 1
177076 C0 out STATUS Channel 0
177076 C1 out STATUS Channel 1
177320 Joystick "Diana", etc.
177700 Keyboard state register
177702 Keyboard data register
177710 State register
177712 Buffer register
177714 Current state register
177716 System control register - Bit 7 - Beeper


 

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