Ok, folks,
I've gotten the Elenco LP-560 (basic probe) and have tested some, but am
becoming even more confused. It has been 40+ years since I used a probe, GO
NAVY. With the probe set to CMOS and Pulse, upon full power up (Mem & Main
Power ON) I have a LO on SRAM CE and S1. After that any combination of reset,
hard reset gives unpredictable readings. If switch to TTL, CE is HIGH upon
power up and goes LO after a reset. S1 seems to follow CE both cases.
Any kind of help would be appreciated.
Just in case this might help...
Elenco LP-560 Specifications
Working Voltage: 4-18VDC
Fequency Responce: 20MHz
TTL: Logic "1" (HI LED) >2.3 +/-0.2VDC
Logic "0" (LO LED) <0.8 +/-0.2VDC
CMOS: Logic "1" (HI LED) >70% Vcc +/-10%
Logic "0" (LO LED) <30% Vcc +/-10%
Minimum Detectable Pulse Width: 25ns
Input Impedance: 1MOhm
Input Overload Protection: +/- 220VAC/DC, 15s
Suppluy Voltage Protection: +/-20VDC
Pulse Indicator Flash Time: 500ms
Operating Temperature: 32º-122ºF
Thanks,
GregS <><
----- Original Message -----
From: "Jeffrey Birt" <[email protected]>
To: [email protected]
Sent: Tuesday, June 5, 2018 5:12:48 AM
Subject: Re: [M100] Model 102 Black Nothing After Y2K ROM install
Interesting the Micronota logic probes are 'collectible' now. I still have the
one I bought in high school and it still works just fine, never thought of it
as collectible though.
Your symptoms sound similar to what I was experiencing recently which, with the
help of the list, was traced back to a faulty RAM module (the standard RAM). It
was hard to sus out what was happening until I got a logic analyzer on the data
bus and traced through what was being read from the ROM and compared that to a
ROM disassembly. I have an older Saleae Logic 8 (not made any longer) but I saw
clones on eBay recently for $10 and the 16 channel clones were $50. It seems
semi-shady to me to use a clone with the Saleae software but there is also an
open source software you can use (which still uses and Saleae driver I think).
Jeff
-----Original Message-----
From: M100 <[email protected]> On Behalf Of Greg Swallow
Sent: Monday, June 4, 2018 11:36 PM
To: [email protected]
Subject: Re: [M100] Model 102 Black Nothing After Y2K ROM install
Will take some time to get a probe.
