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by exxos
Mon Jun 24, 2019 8:41 am
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 15
Views: 212

Re: Reading & write to RTC 12887 ?

I did a read of the address register and it gives 65535, so doing a read to the register basically isn't being driven, which was assumed to be the case anyway. I guess poking the address on the bus doesn't matter in terms of the RW signal.. but to keep my sanity, I am basically doing a write to the ...
by exxos
Mon Jun 24, 2019 8:19 am
Forum: HARDWARE ISSUES
Topic: C-Sync on 520ST C070115 REV.2B
Replies: 4
Views: 58

Re: C-Sync on 520ST C070115 REV.2B

Have you checked the H&V sync which you solder into the motherboard, actually go back to V&G on the GLUE ? Also checked 5V and 0V are present ? You don't say where you got the MB pinout from, but I wouldn't assume its connected or even right.. trace back to the MMU and make double sure.. same with p...
by exxos
Sun Jun 23, 2019 11:13 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 15
Views: 212

Re: Reading & write to RTC 12887 ?

Only just got home, but quickly coded up the firmware and yes I used STOS as it just easier to poke stuff about.. Thankfully I am now seeing a "count" in the values.. Address zero is "seconds" register and its counting.. I think the problem I have now, is when I "peek and poke" it seems to be doing ...
by exxos
Sun Jun 23, 2019 2:19 pm
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: Installing alt-ram assembly problem
Replies: 15
Views: 181

Re: Installing alt-ram assembly problem

Does anyone know to program such a thing in asm ? Probably the way to go is for GB6 to send a number to the asm routine (it passes variables over with other stuff anyway and even returned values) which would be a RAM address to test. Basically just passing "4" for 4MB area and asm routine would just...
by exxos
Sun Jun 23, 2019 12:16 pm
Forum: MONGREL EDITION (version 2)
Topic: ST-IDE-ROM Dev Board v1 - BETA Testers
Replies: 417
Views: 9254

Re: ST-IDE-ROM Dev Board v1 - BETA Testers

:bravo: Fresh blood :thumbup: Icky and I have started on its successor. Though with so many projects ongoing, it likely be some time before we get to test it out properly. We are looking into windows compatible partitions "on the fly". Meaning the byte swapping is done automatically in hardware. Thi...
by exxos
Sun Jun 23, 2019 12:00 pm
Forum: HARDWARE DISCUSSIONS
Topic: Reading & write to RTC 12887 ?
Replies: 15
Views: 212

Re: Reading & write to RTC 12887 ?

I guess it's possible the address register could be read or written to, but I don't really see the point in reading the address back.. As I assume operation would be write the address to the RTC, which selects that address, then read or write back from it. I have emailed Maxim to see if they can cla...
by exxos
Sun Jun 23, 2019 11:43 am
Forum: GAME ZONE
Topic: Time Soldier (no S)
Replies: 1
Views: 38

Re: Time Soldier (no S)

:bravo: :thanksyellow:
by exxos
Sat Jun 22, 2019 5:23 pm
Forum: INTRODUCE YOURSELF
Topic: Hello from Oxford
Replies: 2
Views: 53

Re: Hello from Oxford

:welcomewave:
by exxos
Sat Jun 22, 2019 2:21 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 249

Re: Cartridge Port: Would a buffer board help with problems?

2.2k sils maybe the way to go. Though its possible you may need to change all the pull ups on the address and databus.
by exxos
Sat Jun 22, 2019 1:54 pm
Forum: HARDWARE DISCUSSIONS
Topic: Cartridge Port: Would a buffer board help with problems?
Replies: 18
Views: 249

Re: Cartridge Port: Would a buffer board help with problems?

You could try 2.2K instead. Though when it starts getting into these screwy problems.. its why I gave up working on Falcon and STE stuff as the problems never seem to end. Very hard to debug someone else's designs ontop of it all as well.