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21084

Re: Serial Experience

From: "cmdrcosmac@... [cosmacelf]" ... All spot-on, Chuck. One additional note: The 4093 isn't fast enough to run at much
Lee Hart
1:09 PM
#21084
 
21083

Re: Overclocking: what would YOU like measured?

holy sh*t - 20MHZ. Overclocking indeed! ________________________________ From: cosmacelf@yahoogroups.com on behalf of
bill rowe
12:53 PM
#21083
 
21082

Re: Membership card with Elf2K ROM

... If you mean /EF3 is quiescent high, i.e. pin 22 is high, there is your problem. Pin 22 should be low when the PC transmit line is marking so you need to
fps16xn3
10:16 AM
#21082
 
21081

Re: Overclocking: what would YOU like measured?

... Your are right David, and that is why I need a delay line. Due to the 3:1 time ration between L-H and H-L a capacitor will delay the L-H transition by 3
fps16xn3
10:04 AM
#21081
 
21080

Re: Elf 2000 v88 TEST RAM time per pass mystery

... Thanks for your data point Mark. At least my machine is doing the same thing as other people's! Cheers, Ian.
fps16xn3
9:54 AM
#21080
 
21079

Re: Elf 2000 v88 TEST RAM time per pass mystery

... Thanks for your data point Dave. After I posted the question I realized that I could have tried emma02. With serial port selected and a 3.579 MHz clock
fps16xn3
9:51 AM
#21079
 
21078

Re: Membership card with Elf2K ROM

Obviously, I mean the real ELF2K, not the real ELF ;-)
wd5gnr
9:27 AM
#21078
 
21077

Re: Membership card with Elf2K ROM

A little more data. This works as a loop back program: 0000 start ORG 0H 0000 7b SEQ 0001 36 00 L0: B3 start 0003 7a
wd5gnr
8:44 AM
#21077
 
21076

Re: FORTRAN?

Yeah I liked Fortran pretty well then jumped to PL./I but learning C was a religious experience. This thread got me thinking. I have PiDP 8/I which is
wd5gnr
8:30 AM
#21076
 
21075

Re: FORTRAN?

Ohhhh, good old FORTRAN. I first learned it in high school when a buddy and I took a class at a local community college. Gladys Norman was our instructor, and
    jon
    8:03 AM
    #21075
    This message has attachments
    21074

    Re: Membership card with Elf2K ROM

    Well not q because it works. I thought about that but I'm not clear why the backspaces would show up....ef3 is quiescent high. So if that were backwards and
    wd5gnr
    6:40 AM
    #21074
     
    21073

    Re: Serial Experience

    Thanks: my memory is non-volatile so I don't care about the power control. I do use the clock off-board though so I'm probably better with the gate than just
    bill rowe
    5:45 AM
    #21073
     
    21072

    Re: Overclocking: what would YOU like measured?

    ... If you use a transparent latch like the hc373, then it is the falling edge that matters. -- David W. Schultz http://home.earthlink.net/~david.schultz Well,
    David W. Schultz
    4:35 AM
    #21072
     
    21071

    Re: Membership card with Elf2K ROM

    Yes, it sounds like you need to invert EF3 and Q. -Mark On Sun, Jul 23, 2017 at 12:27 AM, al.williams@... [cosmacelf]
    Mark Abene
    1:29 AM
    #21071
     
    21070

    Re: Membership card with Elf2K ROM

    I lied. I stayed up and put the V85 ROM back in. Same symptom. I also put a piece of paper between the front panel and the main board on the theory that would
    wd5gnr
    12:29 AM
    #21070
     
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