6530-004 TIM – Retro Computing

Terminal Interface Monitor, short TIM, with codename 6530-004, is a 6530 with a monitor program in the mask ROM. No systems were sold around it as far as known, only a manual and the IC.

Information on this page:

– TIM bytes the Apple
– 3 articles from Micro journal on the TIM
– Article on how to expand TIM
– TIM and OSI 400
– TIM MANUAL JUNE, 1977 Rockwell

MOS Technology TIM manual 1976

Here on the bottom of this page you find the Rockwell TIM manual in html format including a scanned listing of the monitor program. (thanks Erik van der Broeck).

And here the machine readable and ready to assemble source, listing and binary of TIM (Thanks Martin Hoffmann-Vetter)

fig 2-2

Expand your TIM

TIM BYTES THE APPLE

(Design by Fred Hatfield, scans and transcription by Tom Owad, https://www.applefritter.com/node/2833)

For those of you that would like to have hard copy capability and much better control over program development on the Apple 1, the following hardware addition will accomplish it.
Using a 6530-004 (‘TIM’ chip) costing about $12.00 gives many superb features such as a variable baud rate serial input/output, a high speed parallel input (high speed paper tape reader), an excellent breakpoint processor, paper tape dump and load routines, etc.
The TTY port is located at locations 6202H and 6203H. Date at that port should be 00H and 16H respectively. The baud rate is stored at 00EAH and 00EBH and 110 baud is represented by 10H and 46H at those locations. It’s a fun addition to the Apple 1. Try it!
Fred Hatfield K8VDU

Teletype connection schematic.

Teletype Pinouts (connections 6530-004 and Apple bus):

       TIM                 APPLE 
     6530-004             6502
        33        D0        33
        32        |         32
        31        |         31
        30        |         30
        29        |         29
        28        |         28
        27        \/        27
        26        D7        26
         5        A9        18
         6        |         17
         7        |         16
         8        |         15
        10        |         14
        11        |         13
        12        |         12
        13        |         11
        14        |         10
        15        AO         9
        16        RES       40
        17        IRQ        4
        1       - GND
       20 - +5V              -----------------------
        3 / PIN25           |  FRED HATFIELD K8VDU  |
          \ 6820            |                       |
       18 - +5V             |     7/77              |
                             -----------------------

TIM articles in the Micro journal in pdf format:
– Micro 1: Terminal Interface monitor (TIM), introduction and description, with am alternative system circuit diagram.
– Micro 3: TIM meets the S100 bus.
– Micro 9: Two short TIM programs. First a program to chage the baudrate, the second is a small operating system.