Search found 120 matches

by DoG
Fri Nov 15, 2019 7:43 am
Forum: HARDWARE ISSUES
Topic: Anyone have it? know it?
Replies: 16
Views: 175

Re: Anyone have it? know it?

Do a RAM check on the diag cart. Does it say 'OK'?
by DoG
Thu Nov 14, 2019 6:25 pm
Forum: HARDWARE ISSUES
Topic: Anyone have it? know it?
Replies: 16
Views: 175

Re: Anyone have it? know it?

Do you have a diagnostic cartridge to test it with?
by DoG
Tue Nov 05, 2019 4:32 pm
Forum: MONGREL H4 USER BUILDS
Topic: DoG's Hx Mongrel build attemt
Replies: 4
Views: 582

Re: DoG's Hx Mongrel build attemt

Ordered all the stuff I was missing yesterday. Seems the postman/woman is coming with it tomorrow. Lucky I already got a few DS1315 and the crystal for it, coz that sucker is expensive. At least from digikey. Well, I guess not that expensive.
by DoG
Sat Nov 02, 2019 12:11 pm
Forum: MONGREL H4 USER BUILDS
Topic: H4 schematic
Replies: 26
Views: 1673

Re: H4 schematic

Not much mention about the GAL for 1.44 floppy access. Is it a 20V8 I guess? I think I got some Lattice 20V8B 10ns laying around. Or is this a later project? Where is the jed file if it's already done? I think I might have missed it if you guys wrote about it in the past somewhere in that case.
by DoG
Thu Oct 31, 2019 7:02 pm
Forum: MONGREL H4 USER BUILDS
Topic: H4 schematic
Replies: 26
Views: 1673

Re: H4 schematic

Yeah. I already checked the schematics on the original ST but I didn't really get how to use it but now I know that it is possible at least. :D :roll: I think that if we can avoid doing skyscraper builds like the ones on the alpha board, we should avoid it. But good to know! I think I have to feed H...
by DoG
Thu Oct 31, 2019 3:59 pm
Forum: MONGREL H4 USER BUILDS
Topic: H4 schematic
Replies: 26
Views: 1673

Re: H4 schematic

By the way. Can you use the 32MHz oscillator (2 pin) which I have desoldered from my donor board instead of the XO 4-pin which you have chosen on the mongrel build? The XO have GND, +5V and clock signal. The 2 pin have +5V and clock?
by DoG
Wed Oct 30, 2019 5:18 pm
Forum: MONGREL H4 USER BUILDS
Topic: H4 schematic
Replies: 26
Views: 1673

Re: H4 schematic

Hmm. Found some small error I think in the BOM:

Cap C46, C47 and C48 is listed as 0805 package/SMD, 50pF but mouser part is 80-C315C510F3G5TA. A Thru hole cap. Part of DAC circuit. Must be wrong?

C10 doesn't have a mouser part number. Part of the audio circuit.
by DoG
Wed Oct 30, 2019 8:27 am
Forum: MEMBER BLOGS
Topic: Looks like I'll be getting a Mega ST4 soon
Replies: 58
Views: 4530

Re: Looks like I'll be getting a Mega ST4 soon

Bank 0 seems fine then. Have you tested piggyback the ram chips on Bank 1? It might work depending on if the chip(s) that is faulty is not shorted inside. You just fit a ram chip on top with friction so that the legs touch each other. Depending on how many you have you can try piggyback all of them ...
by DoG
Mon Oct 28, 2019 7:03 pm
Forum: SOFTWARE
Topic: Wanting to try MultiTos
Replies: 15
Views: 229

Re: Wanting to try MultiTos

The SIMM module can only handle 256Kb or 1Mb simms. So 4Mb is max. Well, easy way anyway... You have to do other tinkering to get 12 Mb.

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