On this page a collection of available SYM-1 hardware and software.

SYM-1 Manuals and sofware

SYM-Physis The SYM-1 USers’ Group newsletter

SYM-1 manuals

Reference manual second printing August 1978
Reference manual third printing June 1979
Technical Notes, April 1979
SYM-1 Theory of Operation Hardware by Robert Peck
SYM-1 Theory of Operation Monitor by Robert Peck
The SYM/KIM Appendix to the First Book of KIM, Robert Peck, 1977
Synertek Programming manual
Hardware manual
Microprocessing fundamentals,
SYM-1 Seminar workbook,
Raymond N. Bennett and John Stockdale, 12/1/79

Hardware bug on pin Z

There is a hardware bug in early AIM-65 boards. The problem was in rev 1 and rev 0 AIM boards, and it was definitely fixed on rev 4 boards Basically the RAM_R/W signal (pin Z on the Expansion connector) had the inverted Phase 2 clock NAND’ed with R/W. The SYM and AIM were both supposed to follow the KIM standard, but Rockwell got this one signal wrong.
Please note that this has to be solved in e.g. RAM expansion boards by generating this signal the correct way.

Reference cards

SYM-1 monitor

The SYM-1 monitor, Supermon, is described in the Reference manual, see above.
Written by Manny Lomas, of TIM-1 and RAP fame.

Two versions of the monitor were shipped, Version 1.0 and Version 1.1.
Version SY1.1 the second release of Supermon, is described in a separate manual.
Appendix M describing the version 1.1 Monitor enhancements and listing.

The ROM contains Supermon, the machine monitor, the audio cassette functions and the boot ROM function (vectors asn such aare cleverly loaded into RAM by some hardware tricks with protected RAM at upper memory.


Written by Manny Lomas, of TIM-1 and RAP fame. RAE is an optional ROM.
An assembler and editor in 8K.
RAE-1 Reference manual.

Reference cards, click for larger view.


9600 baud patch, Disassembler for RAE, RAE to ASCII converter, Cross referencer, all in RAE source format

SYM-1 Basic

One of the Microsoft 6502 Basic versions, made for the SYM-1.
Two versions were made. The first came as two 4K ROMS, V1.1 as one 8K ROM. ROM ID BAS 023-0025A.
The tri-goniometric functions, an option at startup are documented in the Basic manual as hex dump or on page 27 in the Technotes
There were two versions of the BASIC ROMs available.

  • A two ROM set (part numbers 02-0019-01 and 02-0020-1). These went into sockets U21 and U22 respectively.
  • A single ROM (part number 02-0058 A/B). This went into socket U21. It’s 8K and it’s position dependent. It fits in from $C000 to $DFFF.

The 8k Basic has tokens but no code for the trig functions. There’s an application note which invites you to type in the hex and save to tape the approx 512 extra bytes needed. See page 30 of the tech notes.

The 1981 manual shows the correct jumpers for an 8K ROM in U21. The 1978 manual shows the correct jumpers for two 4K ROMs in U21 and U22

BASIC Manual second printing.

BXT_1200 is just 1285 useful bytes, and then filled with FF. It contains the strings PERFECT MATCH!, COMPARE ERROR AT, CHECK SUM ERROR! and INVALID DELETE RANGE!

BXT_0200 is a full 4k bytes, and contains these strings:

MOD-68, MOD-69, SYM-1/68, SYM-1/69

The MOD-69 and MOD-68 replace the 6502 with a Motorola 6809 or 6802 CPU on an adaptor board and the Monitor is replaced  with a new ROM with a new Supermon.

Scans from Synertek Products Guide.

There were also SYM-1s available with the Motorola processor: SYM-1/68 and SYM-1/69.

SYM-1/69 SYM-1 supplement manual

ROM of MOD 69, 2-9002-129 MOD 69 Hi 2-9002-12 MOD 69 Lo
PROM 82S129 of MOD 69 (2103 marked IC in photos below

SYM-1 Pascal

Pascal manual

SYM-1 Forth

SK Forth 79 Users Guide , PDF of Source listing

SYM-1 XRAY Extended RAE, manual and listing

SYM-1 XRAY Extended RAE, manual and listing

SYM-Physis The SYM-1 Users’ Group newsletter

Published from issue 0 September 1979 until the last issue 17 Winter 1983

SYM-Physis Issue 0
SYM-Physis Issue 1
SYM-Physis Issue 2
SYM-Physis Issue 3
SYM-Physis Issue 4
SYM-Physis Issue 5-6
SYM-Physis Issue 7
SYM-Physis Issue 8
SYM-Physis Issue 9
SYM-Physis Issue 10
SYM-Physis Issue 11
SYM-Physis Issue 12
SYM-Physis Issue 13-14
SYM-Physis Issue 15
SYM-Physis Issue 16
SYM-Physis Issue 17