Improving signal strength on Superboard II
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
Yeah everything looks ok. I even changed the clock. It’s all back in this thread earlier.
-
- Posts: 152
- Joined: Thu Dec 14, 2023 2:17 pm
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
Yeah, it's nice and bright a voltages and frequencies look good and within spec. Your board is a replica though right? with more modern components?
-
- Posts: 349
- Joined: Thu Apr 16, 2015 2:27 pm
- Location: Bronx, NY USA
Re: Improving signal strength on Superboard II
Sideburn,
I thought you were getting a stable display on the new monitor. Was I wrong? Is it not as stable as you thought at first? Or are you simply referring to the problems you had with other monitors?
I thought you were getting a stable display on the new monitor. Was I wrong? Is it not as stable as you thought at first? Or are you simply referring to the problems you had with other monitors?
No current OSI hardware
Former programmer for Dwo Quong Fok Lok Sow and Orion Software Associates
Former owner of C1P MF (original version) and C2-8P DF (502-based)
Former programmer for Dwo Quong Fok Lok Sow and Orion Software Associates
Former owner of C1P MF (original version) and C2-8P DF (502-based)
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
I was referring to the "new" (amazon/modermn) displays like the one ronin47 just got that is working for him. my old ebay 9" is working good. I still need to tweak the eprom and see if that fixes there clipping but other than that its good so far.
-
- Posts: 152
- Joined: Thu Dec 14, 2023 2:17 pm
Re: Improving signal strength on Superboard II
Yes, mine is one of the Klyball boards.
I expect that the modern IC's are somewhat better made, though I had a problem of a very flickery display, and I swapped U21 for a 7404 rather than a 74LS04 that was in the BoM, and it fixed it, so components, their manufacture date and type definitely play a part.
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
I went to tackle this clipping issue today but I am struggling trying to find $FFE0 location to change the value.bxdanny wrote: ↑Fri Apr 05, 2024 6:16 pm
That does look good, the monitor seems to be the same width as the keyboard. But the last (48th) character seems to have its right edge cut off, and as there is more than one character width of blank margin on the left, you might want to decrease the value at $FFE0 by one [more].
When you mentioned wanting to add a speaker, I thought (I guess because I had just seen dave's comments to nama about sound from his keyboard) that perhaps you might also want to be able to play the "noise" output from J4. But since you don't have that section populated (it usually wasn't on the 600B), I guess there'd be no point, especially since it takes careful machine-language programming to make that sound like anything other than, well, noise.
I don't see it in XgPro or my hex editor. But i barely know what I am doing.
I am looking at the syn600-48c2k.rom you game me.
Do you mean the 00 D2 at 000000E0 ?
Thnx,
-Tavis
- Attachments
-
- xgpro.jpg (864.79 KiB) Viewed 461 times
-
- hexedit.jpg (1.09 MiB) Viewed 461 times
-
- Posts: 349
- Joined: Thu Apr 16, 2015 2:27 pm
- Location: Bronx, NY USA
Re: Improving signal strength on Superboard II
The 8D shown at location 992 (which is $3E0) would be the location in question. At least if you have pin 19 of the ROM pulled low. I'm not sure if you have it reattached to the A10 line, or still pulled high or low, so unless you have it pulled low, it would really be location 2016 ($7E0) that you want to change.
No current OSI hardware
Former programmer for Dwo Quong Fok Lok Sow and Orion Software Associates
Former owner of C1P MF (original version) and C2-8P DF (502-based)
Former programmer for Dwo Quong Fok Lok Sow and Orion Software Associates
Former owner of C1P MF (original version) and C2-8P DF (502-based)
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
I’m pulling it high at the jumper pads on the board.
A I’ve tied pin 24 and 21 together.
A I’ve tied pin 24 and 21 together.
-
- Posts: 123
- Joined: Sat Feb 03, 2024 10:59 pm
Re: Improving signal strength on Superboard II
Ok so since I am pulling pin 19 high, I will change location 2016 from 8D to 7D. That correct?bxdanny wrote: ↑Sun Apr 14, 2024 7:11 pm The 8D shown at location 992 (which is $3E0) would be the location in question. At least if you have pin 19 of the ROM pulled low. I'm not sure if you have it reattached to the A10 line, or still pulled high or low, so unless you have it pulled low, it would really be location 2016 ($7E0) that you want to change.
change: to: