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by exxos
Mon May 20, 2024 12:11 am
Forum: MONGREL H4 USER BUILDS
Topic: Troubleshooting H4 & H5
Replies: 7
Views: 5545

Re: Troubleshooting H4 & H5

I've done a simple PCB to do the above tests. This will hardwire all the address bus low. So you can check on the ROM socket all address lines are low etc. The data is shown on a bank of LEDs. HI and LO LEDs will light up. I did it this way as if one is floating , it could be causing rapid pulses on...
by exxos
Sun May 19, 2024 11:25 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

Cyprian wrote: Sun May 19, 2024 11:16 pm do you plan to extend ST-RAM size beyond 4MB?
Yes.
by exxos
Sun May 19, 2024 10:54 pm
Forum: CHAT FORUM PUBLIC
Topic: Cyber Legends 3 Poll
Replies: 54
Views: 17980

Re: Cyber Legends 3 Poll

JezC wrote: Tue May 07, 2024 10:50 pm Happy to support either option - still no clear answer about any potential exchange student... :roll:
Bring him/her/them to the event ;) It's part of the british heritage afterall..
by exxos
Sun May 19, 2024 10:37 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

If I remember correctly even TOS 1.x supports more than 4MB RAM. It checks available ST-RAM also above 4MB. Yes that is what I also believe. And what I am asking. Therefore if you have ALT-RAM that starts just above ST-RAM ( $400000 ) needs to be disconnected during memory check. Yes that's precise...
by exxos
Sun May 19, 2024 10:35 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

Darklord wrote: Sun May 19, 2024 10:32 pm The STorm-ST boards need TOS v2.06, EmuTOS or MagiC to work, adding 8 additional megs of ST RAM:
It's not ST ram... its alt-ram. over 4MB ST RAM isn't possible due to hardware limits. Only the Falcon that I know of has true 14 MB STRAM.
by exxos
Sun May 19, 2024 10:03 pm
Forum: DSTB1 & DFB1 booster by BadWolf
Topic: exxos's DFB1 trials
Replies: 615
Views: 34102

Re: exxos's DFB1 trials

Yeah....I'm working on my H5 phoenix board assembly and testing video next! Got a bunch of video already shot and am waiting on the MFP chip I just ordered. ah nice didn't know that channel was yours :) For some reason (because I don't read thoroughly) I thought I could salvage one off my donor. Yo...
by exxos
Sun May 19, 2024 9:51 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

There is 'Maddalt' function: https://freemint.github.io/tos.hyp/en/gemdos_memory.html#Maddalt " »Inform GEMDOS of alternative memory« - Register 'Alternative' RAM with GEMDOS. " It is used to add more than 4 RAM to the TOS memory pool and it was implemented in GEMDOS 0.19 (TOS 2.x) Yes in...
by exxos
Sun May 19, 2024 9:03 pm
Forum: DSTB1 & DFB1 booster by BadWolf
Topic: exxos's DFB1 trials
Replies: 615
Views: 34102

Re: exxos's DFB1 trials

coonsgm wrote: Fri May 17, 2024 6:24 pm Glad you enjoyed the video (and the DFB1). Just to be 100% transparent the DFB1 I used was a hobbyist built one. From what I've read about the Exxos built ones is that they are more refined and stable. I highly recommend it!
Hold up, was that your video then ?
by exxos
Sun May 19, 2024 9:01 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

Cyprian wrote: Sun May 19, 2024 8:17 pm I know that Atari TT can have e.g. 10MB ST-RAM

ST/STE SHIFTER/MMU are limited to 4MB
Yeah they limited by hardware. Though I was more thinking what TOS version had more than 4MB. Not sure what OS the TT has , assume 306 ?
by exxos
Sun May 19, 2024 4:35 pm
Forum: HARDWARE DISCUSSIONS
Topic: Suska board
Replies: 66
Views: 34901

Re: Suska board

Or does anyone know if any machines, other than the falcon, supported more than 4mb ST RAM ?

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