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Aubrey Kagan
11/21/11 13:59
Read: 426 times

#184848 - Can you program them
Responding to: ???'s previous message
Firstly any i8048/8049 is a ROM product and so cannot be user programmed. They can be externally enabled, bypassing the internal memory (see 8035/9 later).

Do you have the means to program the 8748/9? If not perhaps you should be looking at the i8035/9 which were ROMless versions and were intended to use external EPROM- something like a 2716 or 2732. As I recall it needed an octal latch also to store the lower 8 bits of the address. You do sacrifice the 8 pins of the data port as I/O and also require an i8243 I/O expander to recover the 4 port pins associated with the upper address bits (and gain another 12 I/O pins if memory serves).

I probably have a few 8749s, 8039s and 8243s at home. I will check.

What about the format of the code- will you need an assembler or is it in machine code already?


List of 12 messages in thread
Sourcing historic uCs      Greg Kennedy      11/20/11 12:28      
   Vintage MCUs      Michael Karas      11/20/11 13:03      
      8041      Jan Waclawek      11/20/11 13:42      
         Unfortunately ...      Richard Erlacher      11/20/11 16:00      
            external execution in '41/'42      Jan Waclawek      11/21/11 03:15      
               I don't doubt what you said ...      Richard Erlacher      11/21/11 09:45      
   Have some old 8748, 8749 and V20 chips      Bert Van Den Berg      11/20/11 15:27      
      I've got some other old MCU and MPU chips ...      Richard Erlacher      11/20/11 16:08      
   Can you program them      Aubrey Kagan      11/21/11 13:59      
      Some of us have those ... even the programmables      Richard Erlacher      11/21/11 21:27      
   If I can find 'em ...      Richard Erlacher      11/21/11 21:30      
   seems still live      Stefan KAnev      11/22/11 08:03      

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