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Re: Stuff and Things.
Posted: Thu Feb 06, 2020 3:08 pm
by PaulJ
@rubber_jonnie , wrong
@PaulJ_2.0 mentioned.
Re: Stuff and Things.
Posted: Thu Feb 06, 2020 4:13 pm
by rubber_jonnie
PaulJ wrote: ↑Thu Feb 06, 2020 3:08 pm
@rubber_jonnie , wrong @PaulJ_2.0 mentioned.
@PaulJ @PaulJ_2.0
Damn.....
Too many of you lurking about if you need version numbers.....
Re: Stuff and Things.
Posted: Thu Feb 06, 2020 4:22 pm
by PaulJ
rubber_jonnie wrote: ↑Thu Feb 06, 2020 4:13 pm
PaulJ wrote: ↑Thu Feb 06, 2020 3:08 pm
@rubber_jonnie , wrong @PaulJ_2.0 mentioned.
@PaulJ @PaulJ_2.0
Damn.....
Too many of you lurking about if you need version numbers.....
Well your in luck RJ, I don't believe there will ever be a rubber_jonnie_2.0.... I think they broke the mold!!!
Re: Stuff and Things.
Posted: Thu Feb 06, 2020 4:42 pm
by rubber_jonnie
PaulJ wrote: ↑Thu Feb 06, 2020 4:22 pm
Well your in luck RJ, I don't believe there will ever be a rubber_jonnie_2.0.... I think they broke the mold!!!
You may well be right there
@PaulJ
Re: Stuff and Things.
Posted: Sat Feb 08, 2020 9:16 am
by rubber_jonnie
Ah, the satisfaction:
- satisfaction.jpg (64.36 KiB) Viewed 6722 times
Re: Stuff and Things.
Posted: Wed Feb 26, 2020 9:46 pm
by rubber_jonnie
Time to jot down a few things, at least that way I'll remember stuff later, provided I can find this post.
Project wise we're looking at the following:
1. Mega 1 needs to have SILs replaced, it's still sporting the originals. After that we'll see if the IDE interface, stable on the Mega 4 now, will improve.It's a bit hit and miss for now.
2. Mega 1 and Mega 4 probably need mandatory fixes doing, I'll work that out once I've done item 1.
3. Revisit the H4 and do the same sort of troubleshooting as on the Mega 4. I need to install an expansion socket and build a tool to pull down the address bus, /AS, /LDS & /UDS and see what the data bus is doing. Feels like no ROM so this will help decode whats what there.
4. Build a RAM tester. Although thenTL866 Pro I have will test RAM, 41256 and 4164 are not covered, so I'm going to build one of these
http://forum.defence-force.org/viewtopi ... 3NlchvZsnM. I'll post my progress on here.
Guessing everyone esle is busy out in retro Atari land
Re: Stuff and Things.
Posted: Sun Mar 01, 2020 3:49 pm
by rubber_jonnie
Work started building the DRAMArduino RAM tester, more info here:
http://forum.defence-force.org/viewtopi ... 3NlchvZsnM
- dramduino.jpg (133.75 KiB) Viewed 6599 times
I'll post up some more when I've completed the build and tested.
Re: Stuff and Things.
Posted: Sun Mar 01, 2020 4:52 pm
by rubber_jonnie
Also decided that the Mega ST 1 is going to stay more or less stock. It's a nice machine, FDD is good and the case is completely stock with no weird cuts/holes for mods etc.
Here she is before the lid went back on:
- Mega1_Tin.jpg (87.54 KiB) Viewed 6590 times
Minimum MODs done are:
SIL resistors swapped out for new 2.2k items.
2 chip German TOS 1.04 swapped out for 6 chip UK TOS 1.04, see more here:
https://www.exxosforum.co.uk/forum/viewt ... =16&t=2565
Being a Mega ST 1, it had no CPU fan, but I've fitted one from
@exxos
For now I've decided the IDE interface can wait until there is a newer version that is slightly smaller and doesn't get in the way of the case support leg.
Re: Stuff and Things.
Posted: Sun Mar 08, 2020 12:00 am
by rubber_jonnie
Finished the DRAMArduino today as well as fixing the LS11 problem on the H4, so what with getting both Megas sorted last weekend, I've had a pretty good run lately
Here's the complete unit:
- DRAMArduino.jpg (106.15 KiB) Viewed 6556 times
And here's the back side of the protoboard showing my lovely wiring
Took quite a while I must admit.
- DRMArd_Wiring.jpg (106.38 KiB) Viewed 6556 times
Here's the link to the build details and Arduino sketch that makes it all go:
http://forum.defence-force.org/viewtopi ... 3NlchvZsnM
Pop in a DRAM, 4164 (Jumper on for these) or 41256 (Jumper off for these)plug it into a power source and press reset. Then wait for a red or green for nay or yay. Simples
And yes, there is a big bit of fluff in the middle where I cleaned up after with IPA and a cotton bud! Now removed
Will try and build another as I have a second Arduino to hand and all the parts too. I reckon total cost including Arduino is £15-£20.
Re: Stuff and Things.
Posted: Mon Mar 09, 2020 8:30 am
by rubber_jonnie
Ahh the never ending fun and games of retro ownership!
My test board has decided to have a floppy disk outage
Known working FDDs just sitting there with the seek light on permanently and never reaching the desktop. Pull the FDD and desktop happily arrives.
Damn thing worked last time I used it and suddenly this.
Looks like I have another round of troubleshooting in my future.
Thank god for the desoldering gun, it'll certainly make rework a ton easier.