User avatar
m0c
Utrecht, Netherlands

Posted Thu Apr 06, 2023 11:54 am

luvwagn wrote:
Wed Apr 05, 2023 4:25 pm
if you built rejuvenator with RTC chip and you no longer need it, i'd be interested
You'd be interested in the RTC chip you mean? An OKI M6242B from China will only cost you a few bucks, shipping included. Sending you mine wouldn't make any sense ;)

User avatar
luvwagn

Posted Thu Apr 06, 2023 1:16 pm

m0c wrote:
Thu Apr 06, 2023 11:54 am
luvwagn wrote:
Wed Apr 05, 2023 4:25 pm
if you built rejuvenator with RTC chip and you no longer need it, i'd be interested
You'd be interested in the RTC chip you mean? An OKI M6242B from China will only cost you a few bucks, shipping included. Sending you mine wouldn't make any sense ;)
Sorry, thought you might be local :p
Order from China, wait 5-10wks. Order from NL, might actually be quicker ;)

User avatar
m0c
Utrecht, Netherlands

Posted Thu Apr 06, 2023 1:47 pm

luvwagn wrote:
Thu Apr 06, 2023 1:16 pm
Order from China, wait 5-10wks.
It's 5 pcs for about € 4 with 12 day delivery for orders > € 10

User avatar
luvwagn

Posted Thu Apr 06, 2023 4:47 pm

i've been having "challenges" for a number of my orders from AliExpress, and trying to resolve them via their system is beyond frustrating :(

Anyhoo, ordered a set of 5 from a "reputable" seller, let's see what happens.

User avatar
EzdineG
Springfield, MO

Posted Tue Apr 11, 2023 10:56 am

m0c wrote:
Thu Apr 06, 2023 11:54 am
luvwagn wrote:
Wed Apr 05, 2023 4:25 pm
if you built rejuvenator with RTC chip and you no longer need it, i'd be interested
You'd be interested in the RTC chip you mean? An OKI M6242B from China will only cost you a few bucks, shipping included. Sending you mine wouldn't make any sense ;)
In my experience, 9 out of 10 Chinese OKI chips are bad. Sometimes it isn't immediately evident, but an overnight check usually reveals they're not keeping correct time.

User avatar
McTrinsic

Posted Tue Apr 11, 2023 1:00 pm

Alternatively, AFAIK you might as well go for an Epson RTC72421A.

Should be a drop-in replacement that also has an oscillator included and thus saves you the hassle of fine-tuning the trimmer.

User avatar
m0c
Utrecht, Netherlands

Posted Wed Apr 12, 2023 9:22 am

I very much like to build hardware as originally intended by its designer, so no Epson RTC for me. Trimming the OKI for many days is part of the fun for me. I even decided to install the notorious Varta NiMH battery, just because it looks nice.

I am avoiding any 390544-01 Agnus adapters for the same reason, but prefer using either a 1MB 318069-02 or the virtually unobtainable 2MB 318069-18 (Vbb) instead. Should anyone have a 318069-03 Agnus he'd be willing to trade or to part with, please let me know.

User avatar
m0c
Utrecht, Netherlands

Posted Wed Apr 12, 2023 9:40 am

EzdineG wrote:
Tue Apr 11, 2023 10:56 am
In my experience, 9 out of 10 Chinese OKI chips are bad. Sometimes it isn't immediately evident, but an overnight check usually reveals they're not keeping correct time.
Whether they came from eBay, AliExpress or UTsource, my OKIs have always been ok. I once built a GBA1000 which stubbornly refused to retain the time when powered off, even after swapping out the OKI. It turned out that Gary was dead. I had scavenged this green legged Gary from a donor A500+ board with heavy battery damage.

User avatar
luvwagn

Posted Sun Apr 16, 2023 11:29 pm

m0c wrote:
Wed Apr 12, 2023 9:22 am
...prefer using either a 1MB 318069-02 or the virtually unobtainable 2MB 318069-18 (Vbb) instead. Should anyone have a 318069-03 Agnus he'd be willing to trade or to part with, please let me know.
I've been collecting Agnus chips for a batch of 5 rejuvenators that I'm building - ended up getting a weird assortment of PAL and NTSC chips, some for use with 2MB adapters (which saves on doing SOJ-to-DIP RAM adapters / sourcing old DIP RAM), some as a direct fit, etc. (Having a midlife crisis :p)

I've got the following but wasn't too keen to sell just yet, as I'd prefer to bundle them with completed Rejuvenator boards based on buyer's choice (plus 2 of some kind locally kept for me)

Qty 1 - 318069-02 - 1MB PAL <-- is this pin controllable to NTSC?
Qty 3 - 318069-10 VBB - 2MB PAL
Qty 3 - 318069-11 VBB - 2MB NTSC
Qty 2 - 318069-18 VBB - 2MB PAL
Qty 1 - 318069-19 VBB - 2MB NTSC, A3000 (drop in for rejuvenator)

I'll most likely be keeping the NTSC parts for my builds. What makes the 318069-18 unobtanium? What's the advantage of a Rev0 (318069-18) vs. a Rev2 (318069-10)

User avatar
m0c
Utrecht, Netherlands

Posted Sun Apr 23, 2023 2:15 pm

luvwagn wrote:
Sun Apr 16, 2023 11:29 pm
What makes the 318069-18 unobtanium? What's the advantage of a Rev0 (318069-18) vs. a Rev2 (318069-10)
318069-10 is the VBB version of 390544-01.
Both are still fairly common and reasonably affordable, as they can be found on rev. 8A.1 A500(+) boards.

318069-18 is the (PAL) VBB version of 318069-03.
Both have been used almost exclusively in the A3000, which makes them rare.

390544-01 has been reported to work with the Rejuvenator, via an adapter board. Since 390544-01 is pin compatible with 318069-10, I guess the latter will also work, as long as a 100nF capacitor is added between pin 40 and GND.





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