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--- telephony:td816bx_hardware [2025/04/06 13:36] – [ROM mysteries] prppedro
+++ telephony:td816bx_hardware [2025/04/19 23:44] (current) – prppedro
@@ Line 8: / Line 8: @@
 The ROM complex is detachable, for reasons I deem unclear, since those chips are already seated on sockets. See below for more information on that detachable board.
-## ROM mysteries
+## ROM version
-As mentioned below, this unit has P401 software, dating back to 1996. It's an old ROM. The system seems to not have more than 320 KB of RAM. By all hardware measures, it seems to map to at least version "-1", which also corroborated by [this post](https://forum.nortel.spb.ru/archive/forum-10-pbx/t-5622.html):
+As mentioned below, this unit has P401 software, dating back to 1996. It's an old ROM. The system seems to not have more than 320 KB of RAM. By all hardware measures, it seems to map to at least version "-1", which also corroborated by [this](https://www.tek-tips.com/threads/need-rom-kx-td1232-dash-6.1789345/) and [this](https://forum.nortel.spb.ru/archive/forum-10-pbx/t-5622.html) posts:
 ```
 KX-TD816 Chip information:
 -0 P011 Non-DPITS pre-DPITS 8MHz CPU. 2MB, RAM 256K
--0.5 P051I / first DPITS 8MHz CPU. 4MB, RAM 256K
+-0,5 P051I / first DPITS 8MHz CPU. 4MB, RAM 256K
 -1 P401A / B DPITS 8MHz CPU. 4MB, RAM 256K (Suffix of Serial No. "N?"), RAM 1M (Suffix of Serial No. "O?")
 -2 P301C / H 12MHz CPU. 8MB
@@ Line 25: / Line 25: @@
 ```
-However, {{ :telephony:td1232-816detailedfeaturelistperversion.pdf |this document}} contradicts those informations, since this ROM does have a lot of features that would make it a `-4` model. Oh, and the CPU seems to be a 12 MHz model, as well.
+And [this webpage](https://komendant.pro/spr/viewthread/17334/#91783) also lists a fuckton of other versions.
-In reality, it shouldn't matter much, unless you need specific features. In my case, KX-TD193DX Caller ID card won't work with P401A ROM. FIXME [Put the 193DX investigation in a separate article]
+In addition to those sources, {{ :telephony:td1232-816detailedfeaturelistperversion.pdf |this document}} seems to confirm we got at least a `-1` unit. I used to believe I had `-4` software level because I was using a programming guide that seemed to be 1:1 with my ROM, but, in fact, I confirmed later that several newer features were missing.
+Critically, we're missing support for newer expansion cards, like the KX-TD193DX Caller ID card I've bought. Other than that, the losses are a bit minor. There are some features in that document that I kind of wanted, but none I can't live without (FFS, I could've even live without the central itself, so everything I got thus far is already pretty dope.)
+As for the Caller ID card, this is an adventure on it's own, and this KX-TD193DX card is basically the same card (TA123293) used by TA1232, the non-DPITS, older version of TD1232, from what I gather. TA1232 itself is a eerily similar project. I'm discussing those topics [[telephony:ta1232_td816_td1232_hw_arch#caller_identification_card|on a different article]].
 ## ROM/RTC clock Board
@@ Line 35: / Line 39: @@
 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;
+- IC20: **P401A** (**_P401A_**60905A), first firmware, UV-EPROM, probably 27C801, according to [this post](https://www.tek-tips.com/threads/kx-td1232-eprom-memories.1563807/);
-- IC21: **P402A**, Google returns nothing useful, unknown ROM chip;
+- IC21: **P402A**, auxiliary UV-EPROM, probably also a 27C801;
 - 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**;
@@ Line 42: / Line 46: @@
 - X2: **32.768 kHz crystal oscillator** for the RTC chip;
 - BAT: **CR2354 battery**, 3V, probaly of the /1GUF variant.
 ### Problems
@@ Line 65: / Line 71: @@
 - IC8, IC15, IC18: also look like CODECs.
+If IC22-IC23(?) is really part of the system's memory, this brings the system to 320 KB of RAM, which we may agree is a **very** weird amount of RAM. Those systems are said to have either 256 KB or 1 MB, in the most recent revisions.
+This makes the system kind of an hybrid between -1 and -2, hardware-wise. The CPU smells like 12 MHz, judging by it's model suffix (the datasheet for it mentions 8~16 MHz sub-models), but the amount of RAM is very far behind even other models of -1 (cf. «ROM mysteries» above.)

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