jblang

#
# Copyright (C) 2011-2013 Michael Vogt <[email protected]>
#
# This file is part of PixelController.
#
# PixelController is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#

jblang

TPM2 Protocol Implementation

Introduction

Frame data is transferred inside packets (similar to DMX, for example). A frame is an image representing a matrix or a light scene.

The packets start and end with one-byte characters. In between are a few control bytes followed by the payload. There is no set size for a payload; it is transmitted with each packet. This makes the protocol quite flexible. There are enough bytes in a single packet for an RGB matrix with 21,845 pixels, but if you just want to control an RGBW lamp, that only requires 9 bytes. The variable frame size means there is no overhead, allowing for maximum transfer speed.

TPM2 Packet Structure

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Emulators

VICE is the best by such a commanding margin that you really needn't look elsewhere. Open source and has the largest community.

However, other options are:

• CCS64, Lots of features, but I found it to be painfully slow. Shareware.
• Hoxs64. Decent, but not as full-featured as VICE. The ML monitor seems nice.
• Frodo is pretty outdated and the author admits as much.
• micro64 seems promising but incomplete.

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; kernal locations

CHRGET  = $73               ; subroutine: get next basic text character
STATUS  = $90               ; kernal i/o status word
STKEY   = $91               ; flag: was stop key pressed
DFLTO   = $9A               ; default output device
MSGFLG  = $9D               ; flag: kernal message control
SAL     = $AC               ; pointer: starting address of load/screen scrolling
TAPE1   = $B2               ; pointer: start of tape buffer
FNLEN   = $B7               ; length of current filename

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;
; **** ZP FIELDS **** 
;
f24 = $24
RESHO = $26
FRETOP = $33
CAS1 = $C0
CURCMD = $C1
CURCMDH = $C2
;

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hello   
/ above: title line - was punched in human readable letters on paper tape
/ below: location specifier - told assembler what address to assemble to
100/
lup,	lac i ptr		/ load ac from address stored in pointer
	cli			/ clear io register
lu2,	rcl 6s			/ rotate combined ac + io reg 6 bits to the left
				/ left 6 bits in ac move into right 6 bits of io reg
	tyo			/ type out character in 6 right-most bits of io reg
	sza			/ skip next instr if accumulator is zero

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; A Mind is Born by Linus Akesson
; https://linusakesson.net/scene/a-mind-is-born/index.php
; transcribed to 64tass and further commented by J.B. Langston

; important locations after program is copied to zero page

vmptr      = $cb        ; video matrix
clock      = $13        ; global clock lsb - indicates position within bar
clock_msb  = $20        ; global clock msb - indicates bar of song
script     = $21        ; poke table

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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/stat.h>

#define MEMSIZ 64*1024
#define GETLOC 0x20

uint16_t get, put;
uint8_t cur, mem[MEMSIZ];

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C:\Users\jblang\Retro\DEC\PDP1>macro1 -s hello.mac
hello    - pass 1
hello    - pass 2

C:\Users\jblang\Retro\DEC\PDP1>pdp1

PDP-1 simulator V4.0-0 Beta        git commit id: ea898b24
sim> att ptr hello.rim
sim> boot ptr
hello, world

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module cpu_tb;

reg clk;
reg reset;
reg irq;
reg nmi;
reg rdy;

wire [15:0] addr;
wire [7:0] cpu_do;