[Coco] Bit-Banger Serial as external console?

[Stephen Pereira]

Hi Bill,

Nope, not HDBDOS.  As I stated in my original post, I have the stock CoCo 3 with Zipster’s SDC only.

Thanks!

smp
- - -
Stephen Pereira
Bedford, NH  03110
KB1SXE


> On Mar 26, 2019, at 3:35 PM, Bill Pierce via Coco <coco at maltedmedia.com> wrote:
> 
> Stephen, if you're using hdbdos, then you probably need to use the slowdown poke as hdbdos for Coco3 always runs in double speed. This will double your baud rate. In fact, that's why it was done to start with, to get the baud rate needed for drivewire.
> 
> 
> 
> -----Original Message-----
> From: Stephen Pereira <stephen.m.pereira.sr at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Tue, Mar 26, 2019 3:18 pm
> Subject: Re: [Coco] Bit-Banger Serial as external console?
> 
> Hello again, folks,
> 
> I took Arthur’s advice and started looking for BBS code.  I ended up looking at an article in the November 1983 Rainbow titled “Remote Operation of the Color Computer”.  It has exactly what I think I need.  The tiny assembly language program installs input & output from a remote terminal along with the normal keyboard and screen.  When running, a person at the remote terminal can operate the CoCo as if they were directly on the system.
> 
> Of course, the trouble is that the program does not work for me on my CoCo 3.  The communication gets established, but the actual characters get scrambled in both directions.  I’ve tried 150, 300 and 600 Baud, as well as 1 or 2 stop bits, and 7 or 8 data bits.
> 
> I’m concerned that maybe this code cannot work properly on the CoCo 3 because it had not yet arrived?  
> 
> Here’s a copy of the code if anyone else would like to try it out.  Please let me know if you are successful!
> 
> ********************************
> *          REMOTE            *
> *  A REMOTE TERMINAL DRIVER  *
> *        FOR THE COCO          *
> * DAN DOWNARD  RAINBOW  11/83 *
> ********************************
>         ORG    $3F00
> * EQUATES FOR ROM & RAM ADDRESSES
> IHOOK  EQU    $016A
> OHOOK  EQU    $0167
> PIA    EQU    $FF22
> POLCAT  EQU    $A000
> RSOUT  EQU    $BE0C
> BAUD    EQU    $E6
> BAUDR  EQU    $C9
> DEV    EQU    $6F
> FLAG    EQU    $70
> * INITIALIZE RAM HOOKS
> START  LDA    #BAUDR
>         STA    <BAUD
>         LDX    1+OHOOK
>         STX    1+ORET2,PCR
>         LDX    1+IHOOK
>         STX    1+IRET2,PCR
>         LDA    #$7E
>         STA    IHOOK
>         STA    OHOOK
>         LEAX    OUT,PCR
>         STX    1+OHOOK
>         LEAX    IN,PCR
>         STX    1+IHOOK
> RET    RTS
> * OUTPUT CHARACTER IF DEV=0
> * INSERT LINE FEED TO REMOTE DEVICE
> * USE ROM SUBROUTINE
> OUT    PSHS    A
>         TST    <DEV
>         BNE    ORET1
>         CMPA    #$0D
>         BNE    REMOUT
>         LDA    #$0A
>         JSR    RSOUT
>         LDA    #$0D
> REMOUT  JSR    RSOUT
> ORET1  PULS    A
> ORET2  JMP    RET
> * INPUT FROM KEYBOARD OR RS-232
> * IF DEV=0
> * USE RSIN FOR REMOTE INPUT
> IN      CLR    <FLAG
>         TST    <DEV
>         BNE    IRET2
>         LEAS    2,S
>         PSHS    B,CC,X
> IN1    JSR    [POLCAT]
>         BEQ    REMIN
>         BRA    IRET1
> * CHECK FOR REMOTE INPUT
> REMIN  LDB    $FF22
>         RORB
>         BCS    IN1
> * RS-232 INPUT ROUTINE
> * BYTE INTO A REGISTER
> RSIN    BSR    HALF
>         LDB    #1
>         PSHS    B
>         CLRA
> RSIN1  BSR    FULL
>         LDB    PIA
>         RORB
>         BCC    RSIN2
>         ORA    0,S
> RSIN2  ASL    0,S
>         BCC    RSIN1
>         LEAS    1,S
>         ANDA    #$7F
> IRET1  PULS    B,CC,X,PC
> IRET2  JMP    RET
> * BAUD RATE DELAYS
> FULL    BSR    HALF
> HALF    PSHS    A
>         LDA    <BAUD
> HALF1  BRN    HALF1
>         DECA
>         BNE    HALF1
>         PULS    PC,A
>         END    START
>         
> 
> smp
> - - -
> Stephen Pereira
> Bedford, NH  03110
> KB1SXE
> 
> 
>> On Mar 26, 2019, at 2:03 PM, Chester A Patterson <vchester at setec-cr.com> wrote:
>> 
>> Years ago I used Cocos via their bit-bangers to communicate with remote screens connected to scales in production lines. The scale keyboard had three function keys to communicate back to the Coco. So the scale operator interacted with the Coco all day. I enjoyed those projects immensely.  I got the idea because of reading in Rainbow (I think) of some oil drilling site that used a Coco to control the drilling. Ages ago that.
>> 
>> -----Original Message-----
>> From: Stephen Fischer <SFischer1 at Mindspring.com> 
>> Sent: Monday, March 25, 2019 9:47 PM
>> To: coco at maltedmedia.com
>> Subject: Re: [Coco] Bit-Banger Serial as external console?
>> 
>> 
>> It is out of scope for your project,
>> 
>> But I remember vaguely using OS-9 to log in on another computer using the bit banger on the CoCo.
>> 
>> If someone can confirm that, the NitrOS-9 source code might be useful to look at.
>> 
>> It has been 25 +- 10 or more years so my memory is very fuzzy.
>> 
>> SHF
>> 
>> 
>> 
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