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--- telephony:td816_hardware [2025/03/14 03:29] – [ROM/RTC Board] prppedro
+++ telephony:td816_hardware [2025/03/14 09:04] (current) – removed prppedro
@@ Line 1: / Line 1: @@
-# Panasonic KX-TD816BX Hardware Insights
-## ROM/RTC Board
-{{:telephony:pqup10092zb.png|}}
-This complex seems to be upgradeable (if you ever find that stuff.) Here we can find:
-- IC20: *P401A*, matches the system ROM version (*P401A*60905A), so it's probably the main firmware;
-- IC21: *P402A*, Google returns nothing useful, unknown ROM chip;
-- IC24: *CXK581000AP-10LL*, or _131072-word × 8-bit High Speed CMOS Static RAM_, which seems to provide our system with healthy 128 KB;
-- IC25: idem, bringing the total amount of RAM in this module to 256 KB;
-- IC26: OKI M6242B, an RTC clock chip;
-- X2: 32.768 kHz crystal oscillator for the RTC chip;
-- BAT: CR2354 battery, 3V, probaly of the /1GUF variant.
-### Problems
-- The RTC battery is probably long dead and showing signs of oxidation on it's legs;
-- There's was a bad leak under the RTC oscillator, that I've already removed, after taking this photo;
-- This same oscillator isn't operating reliably, sometimes it takes a while for the clock to start, well, _clocking_, and this component is probably the culprit;

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