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Solid State Music IO-4

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    Solid State Music IO-4

    Hi All;

    I have my other serial card working, and now for this one with John's Monitor..

    I have it Displaying correctly, But, it won't show input..

    I am wondering How or which status bits do I hook up to which Data bits to make it work correctly, with John's Monitor Program ??

    THANK YOU Marty

    #2
    Hi All;

    I May have the information that I need, the IO-4 can be wired up to act like the 8251 UART, and that I have done, I then have some code from ther book '8080 8085 Software Design' (Book 2) on the chapter on UARTS..

    The code is alot like John's with small differences, so tomorrow I will see if this code or the information from this chapter helps..

    THANK YOU Marty

    Comment


      #3
      Hi All;

      A couple of more things, the SSM IO-4, uses a TR1602 Uart, which I have wired to Emulate at least port wise an 8251 Uart..

      Dave, on another place, You helped someone with a IMSAI Serial Card, and so with minor changes, I can see if that code will work with what I have..

      Here is the Link -- http://www.vcfed.org/forum/showthrea...el-8251A-USART

      THANK YOU Marty
      Last edited by Marty; May 17, 2020, 04:29 PM.

      Comment


        #4
        Marty,

        Here is a listing of a quick echo test I used for my SSM IO-4. It includes the configuration information.
        Note that it is set up for "Standard" MDS I/O. Sorry for the spacing problems in the listing. I copied it in
        from a text file but it dropped all of the nice spacing that I had in it. Copy it out to your text file and edit
        all of the spacing back in so it will be more readable. Hope this helps.


        ;
        ; IO4TST.ASM ECHO TEST ROUTINE
        ; MDS "STANDARD" CONFIGURATION
        ;
        ; S1-1-2 OFF
        ; S1-3 ON
        ; S1-4-7 OFF
        ;
        ; S2-1-2 OFF
        ; S2-3 ON
        ; S2-4-7 OFF
        ;
        ; W1 4-9 D0 DAV
        ; W1 5-16 D7 TBMT
        ;
        ; W2 4-9 D0 DAV
        ; W2 5-16 D7 TBMT
        ;
        ; JUMP ON NOT ZEROS
        ;
        ; U16 74(LS)368
        ; U18 74(LS)368
        ;
        ; S3 ALL ON
        ;
        ; S4-1-2 OFF
        ; S4-3-7 ON
        ;
        ;
        ORIGIN EQU 4000H ;CODE ADDRESS
        HOLD EQU 3000H ;BYTE HOLD ADDRESS
        ;
        TSTAT EQU 00H ;List status port
        TDATA EQU 01H ;List data port
        INMSK4 EQU 01H ;DAV - INPUT MASK
        OMSK4 EQU 80H ;TBMT - OUTPUT MASK
        ;
        START: ORG ORIGIN
        ;
        ; INPUT STATUS ROUTINE
        ;
        ISTAT: IN TSTAT ;READ STATUS PORT
        ANI INMSK4 ;INPUT STATUS BIT
        JNZ ISTAT
        ;
        ; INPUT ROUTINE
        ;
        IDATA: IN TDATA ;READ DATA PORT
        STA HOLD ;STORE BYTE
        ;
        ; OUTPUT STATUS ROUTINE
        ;
        OSTAT: IN TSTAT ;READ STATUS PORT
        ANI OMSK4 ;OUTPUT STATUS BIT
        JNZ OSTAT
        ;
        ; OUTPUT ROUTINE
        ;
        ODATA: LDA HOLD ;RETRIEVE STORED BYTE
        OUT TDATA ;WRITE DATA PORT
        JMP ISTAT
        ;
        END



        Good luck,
        Phillip

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