BYTE: Part 7a (DRAM checking starts)

Channel:
Australia The Clueless Engineer
Subscribers:
3,220
Published on ● Video Link: https://www.youtube.com/watch?v=3WrMjpcSoUs


Duration: 8:01
207 views
12

So, finally got around to looking at the Moldovan BYTE again.

We suspected that the DRAM was at fault.

I need to de-solder each КР565РУ5 (KR565RU5) DRAM chip ... every second one has a decoupling capacitor draped over it ... but my heart just isn't in it at the moment ...

I started de-soldering the DRAM last week on the Ukrainian Олимпик (Olympic) machine and the traces were just coming off and breaking ... that board is definitely low quality and not really meant to be repaired :(

So this is just a start - I got one de-soldered and checked in the DRAMARDUINO ... looks good. Just seven more to check ... but I'm worried that all eight will be okay ... in which case ... the ULA is at fault .... or the Z80 ... there ain't nuthin' left on the board apart from passives ... :(



Other Videos By The Clueless Engineer


2022-10-10#MEGA65: Part 6a (C64 cartridges)
2022-10-09Elan Enterprise 64: Part 2 (Upgrade test)
2022-10-08Ленинград-1 (Leningrad): Part 4b (Decoupling capacitors)
2022-10-08Ленинград-1 (Leningrad): Part 4a (Troubleshooting starts)
2022-10-08Ленинград-1 (Leningrad): Part 3 (Powering on)
2022-10-07Retro Chip Tester Pro: Progress 7-Oct-2022
2022-10-06BYTE: Part 8 (Checking the 2nd BYTE)
2022-10-05BYTEs: A pair of Moldovan Speccy Clones
2022-10-05Ленинград-1 (Leningrad): Part 2 (What's inside?)
2022-10-04Ленинград-1 (Leningrad): Part 1 (Power supply)
2022-10-04BYTE: Part 7a (DRAM checking starts)
2022-10-03Coming Soon: The Ленинград-1 (Leningrad-1) Speccy clone
2022-10-03DIGIRULE 2U: an 8-bit computer on your ruler
2022-10-02Amstrad CPC464: Part 4 (6128 firmware)
2022-09-30Coming Soon: A few VICs to fix
2022-09-30Amstrad CPC: Power switch fix
2022-09-29Quick Update: Thur 29-Sept-2022
2022-09-26Партнер-01.01 (Partner): Part 5 (weird BASIC behaviour)
2022-09-25Партнер-01.01 (Partner): Part 4 (quick test of supervisor (?) commands)
2022-09-25Партнер-01.01 (Partner): Part 3 (Keyboard refurbish)
2022-09-24Партнер-01.01 (Partner): Part 2 (Repair & boot)