Imported from GitHub: hanshuebner/atlas-11 · commit 9580e2c · license MIT

Description

MOVED to code.netzhansa.com/hanshuebner/atlas-11. This GitHub mirror is archived.

README

ATLAS-11 DCJ-11 I/O controller

ATLAS-11 is computer system based around the DCJ11 microprocessor. The DCJ11 is a VLSI implementation of the PDP-11 minicomputer. ATLAS-11 is based on the DCJ-11 SBC CPU board, designed by Peter Schranz, which hosts the CPU and the system RAM. An extension card with a PGA2350 microcontroller board implements the boot ROM, USB CDC serial ports and storage on an MicroSD card. The system runs FIG FORTH 1.3.3.

RP2350 GPIO / PIN usage

GPIO Pin	Function	Description
GPIO 0	UART0 TX	UART0 Transmit
GPIO 1	UART0 RX	UART0 Receive
GPIO 2	Power Control	Controls power to DCJ11 SBC
GPIO 5	DAL0	Data Address Line 0
GPIO 6	DAL1	Data Address Line 1
GPIO 7	DAL2	Data Address Line 2
GPIO 8	DAL3	Data Address Line 3
GPIO 9	DAL4	Data Address Line 4
GPIO 10	DAL5	Data Address Line 5
GPIO 11	DAL6	Data Address Line 6
GPIO 12	DAL7	Data Address Line 7
GPIO 13	DAL8	Data Address Line 8
GPIO 14	DAL9	Data Address Line 9
GPIO 15	DAL10	Data Address Line 10
GPIO 16	DAL11	Data Address Line 11
GPIO 17	DAL12	Data Address Line 12
GPIO 18	DAL13	Data Address Line 13
GPIO 19	DAL14	Data Address Line 14
GPIO 20	DAL15	Data Address Line 15
GPIO 21	nBUFCTL	Buffer Control (Read/Write)
GPIO 22	HALT	Halt signal
GPIO 23	nALE	Address Latch Enable (negative logic)
GPIO 24	nSCTL	Stretch Control
GPIO 25	nCONT	Continue signal (negative logic)
GPIO 26	INIT	Initialize signal
GPIO 27	nIO	I/O access
GPIO 43	SPI1_TX	SDCARD MOSI
GPIO 44	SPI1_RX	SDCARD MISO
GPIO 45	SPI1_CSn	SDCARD CS
GPIO 46	SPI1_SCK	SDCARD SCK