RE: Weird problem writing buffer 1 of a 8250 drive

From: Anders Carlsson (
Date: 2008-09-08 19:00:33

Hello all,

I found it astonishing if Memory-Write would not work on a 8250,
and it took over 25 years to figure it out.

Thus when I came home this evening, I brought out a 8250LP and a
CBM 610. In theory I could test with a full-height 8250 and/or a
8032-SK or even a 3032, but I don't think the results would be
that more different, just more computers to lug around for me.

Anyway, see the linked photo which is a bit blurry but displays
both the computer, the drive and my 28" TV with this Basic program:

10 open1,8,15
15 rem print#1,"i0"
17 fori=0to15
20 print#1,"m-w"chr$(i)chr$(18)chr$(1)chr$(i+72)
22 next
23 fori=0to15:print#1,"m-r"chr$(i)chr$(18)chr$(1)
25 get#1,a$:printasc(a$+chr$(0));
27 next
30 close1
  72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
  64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79

Well, it looks like at least my 8250LP has the correct ROMs. Do you
think it is important for me to go down to the basement and pick up
a full-height 8250 to cross check? Can the type of PET/CBM computer
make a difference?

If this program does not work on Ruud's 8296D, it sounds like his
drive has some fault or a different ROM version. After all, from what
I remember a 8296D effectively contains a 8250LP - both boards and
drives being the same type, just the connecting cable twisted around.

Best regards

Anders Carlsson

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