The quality of the information shared on this listserv is off the charts.I
joined many moons ago when the focus was on simply using the Model T platform.
The transformative innovation, while often over my head, has been remarkable to
watch, support and use.
On Friday, July 17, 2020,
Cool thanks! I look forward to this
From: M100 on behalf of Stephen Adolph
Sent: Friday, July 17, 2020 6:27:33 PM
To: m...@bitchin100.com
Subject: [M100] MVT100 update
Hey all,
Just a quick note to say I have some progress to report on the MVT100 video
my 2 cents;
Worth it to see if you have valid signals at both the main ROM and at each
of the installed rams but most importantly the "top 8k". meaning the 8K RAM
that is closest to the system socket.
if there happens to be a cracked track on the PCB, that affects the memory
subsystem, you will
Thanks Jeff B, & Bert P.
I will review the note from Ian, and in the meantime did recheck the CPU
(using a logic probe and my BK Precision multimeter).
Crystal Oscillators
- X1 = 32.76 khz
- X2 = 4.916 mhz
M19/CPU
- #1 = constant signal
- #2 = 4.916 mhz
- #12-19 (AD0-7) =
Hey all,
Just a quick note to say I have some progress to report on the MVT100
video adapter. Boards are back finally and they look to be fine.
I have some work to do to sort out how to program the PIC correctly.
Once that is done I will be able to send out the kits to those who let me
know
>>Cheers,Bert (not Jeff :-)
There can never be too many Berts, Birts, Burts,
Jeff Birt
i.e. the machine will not boot. If the screen is blank, blind type in
‘beep’ and press return. If this works you know the machine is booting
Press Enter once to get into BASIC first.
--
bkw
M28 has to do with the low voltage reset. If pin 13 of M28 is low, then you are
not in low voltage reset so T20 will not be switched on which kills the power
supply.
Generally having a screen with all dark elements with these Hitachi type LCD
controllers means the LCD is not being
Hi Alan,
I'm with Jeff on this one. So far you've shown that you've tested
voltages, cables, even the LCD contrast pot, but you haven't really
talked about the logic side. You mentioned you replaced all the RAM
(even installing sockets), as well as re-capping the board, but so far I
haven't
Hi Matt
Thanks. I have found similar issue with the LCD cable on the ends,
corrected and carefully reinserted. I will take another look, and redo
continuity from connector to connector.
If I can find a flat ribbon with the correct specs, I’ll also try to order
a replacement.
Here’s to hoping I
I'm not sure the exact size, but when I repaired one a few years ago I
just ordered a bag of assorted sizes from eBay and found two that
worked perfectly.
On Fri, 2020-07-17 at 18:44 +, Steve Glenner wrote:
> I purchased a Radio Shack CCR-82 Data Cassette Recorder on eBay, but the
> seller
Hi Alan,
I was working through a similar issue recently. Fortunately, I had access
to a logic analyzer and was able to confirm that the CPU was operating
properly, and even where in the ROM it was looping. Once I was able to
determine it was waiting for the LCD status to change, I rechecked the
I purchased a Radio Shack CCR-82 Data Cassette Recorder on eBay, but the seller
says it needs a new belt (for the reels at least, not sure about capstan or
counter).
Does anyone know the size of these belts so I can buy replacements or a seller
of OEM replacement belts?
Thanks
Thanks Jeff. I have revisited all the documented diagnostics in the service
manual, and checked/re-checked all the voltages, reset circuit and LCD.
The current state is that the system has correct voltages in both
power-on/memory-on and power-off/memory-on modes. The LCD works, in as much
as it
I went ahead and bought one :)
On 2020-07-15 6:15 p.m., Francois Gurin wrote:
... And thank you for it. I bought one for the TPPD2 recently and can
say the attention to detail is clear. As a favor I would expect a
generic floppy with a hand wriiten label. The disk I got from
arcadeshopper
Brian,
You're absolutely right - The original use case they were designed for
likely saw no switch movement.
Kindest regards,
Doug Jackson
em: d...@doughq.com
ph: 0414 986878
Check out my awesome clocks at www.dougswordclocks.com
Follow my amateur radio adventures at vk1zdj.net
On 7/16/20 11:46 PM, Doug Jackson wrote:
Thats awesome news.
Sadly, that application is an abuse for that type of DIP switch - it is
designed to be set and left alone inside a piece of equipment.
To be fair to the drive designers, that's probably exactly the way it
was used, since the drive
17 matches
Mail list logo
