Search found 308 matches

by Petari
Wed Jan 17, 2018 8:02 am
Forum: DISPLAYS & CONVERTERS
Topic: Atari ST Display Basics
Replies: 31
Views: 12959

Re: Atari ST Display Basics

It is possible that Falcon works at 60 Hz refresh rate. That is set in NV RAM. You should be able to see it in monitor's Information mode or like. Some people added resistors to RGB lines in cables for ST(R), because analog amplitudes are too high. I don't know about that Falcon perhaps gives more s...
by Petari
Sun Jan 14, 2018 1:47 pm
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 9567

Re: no-software internal RTC

Since RP5C15 has 6 bits for year, it means that it could count years up to 2043 - calculating by start year=1980 , and 6 bits can be 0-63 . That means that chip self is actually OK for this century too ( well, for first 43% of :D ) , but TOS handles it not properly. Probably just displaying part - b...
by Petari
Sun Jan 14, 2018 12:09 pm
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 9567

Re: no-software internal RTC

RTC chips, at least those old ones store not exact year value, but some number of bits for year. Similar is with TOS date format. It has 7 bits for year, and starts at 1980 - so value 0 in year field means 1980 . Some may ask: how then it's not year 2000 compliant ? I guess there are some code parts...
by Petari
Sun Jan 14, 2018 11:22 am
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 9567

Re: no-software internal RTC

Actually the tos supports directly at least one rtc ic, the ricoh rp5c15, it's hard to find and you have to develop a board, but all you need to use it is atari's control panel. I made it in past. After project in ST Magazine - if I remember correct. No board developing, just on prototype board. It...
by Petari
Sun Jan 14, 2018 7:55 am
Forum: RTC (Real time clock)
Topic: no-software internal RTC
Replies: 49
Views: 9567

Re: no-software internal RTC

Well, talking about what would be simpler: 1: Modding TOS, so no need for additional SW - in case of using some dedicated RTC chip. 2: Adding battery + couple cheap parts to ensure power of IKBD chip when ST is not powered on. http://atari.8bitchip.info/ikbdbatt.html And most important: none of 2 me...
by Petari
Tue Jan 09, 2018 8:43 am
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: AES 3.4 into Tos 2.06/3.06
Replies: 19
Views: 3458

Re: AES 3.4 into Tos 2.06/3.06

I just can't believe that Falcon AES can fit in TOS 2.06 space - it is 512KB vs. 256KB total ROM space. I'm afraid that there is some mistake made by someone. Probably just some parts of Falcon AES, Desktop. As Gembench says "Don't believe everything you see" :D
by Petari
Tue Jan 09, 2018 7:16 am
Forum: SOFTWARE PROGRAMMING & DISCUSSION
Topic: AES 3.4 into Tos 2.06/3.06
Replies: 19
Views: 3458

Re: AES 3.4 into Tos 2.06/3.06

TOS 2.06 is in 256KB space, while 3.xx and 4.xx are in 512KB. So, I don't think that Falcon AES can fit in 2.06, or better said in 256 KB. Of course, we can enlarge ROM space in ST machines, and even in STE ones, to 512KB, but that is not 'into 2.06' . And I would ask for that Falcon AES code - wher...
by Petari
Wed Jan 03, 2018 8:52 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 522
Views: 61143

Re: Project: HDMI/DVI out for STFM

Hi-color displaying, so Spectrum 512, Photochrome and similar, then overscan are very timing sensitive. My simple vertical overscan with res. 320x273 needs testing of CPU speed for correct work on NTSC machines - because on them CPU clock is little different. Spectrum 512 normally shows same border ...
by Petari
Tue Jan 02, 2018 12:58 pm
Forum: EVERYTHING ELSE
Topic: VHDL CACHE ?
Replies: 21
Views: 5041

Re: VHDL CACHE ?

Well, I let that overclocking to you and troed. Same as with overclocking FDC chip for HD floppies - some can work fine at 16 MHz, some not. With aged machines it will be just worse. Time too look after that Altera Cyclone ...
by Petari
Tue Jan 02, 2018 12:39 pm
Forum: EVERYTHING ELSE
Topic: VHDL CACHE ?
Replies: 21
Views: 5041

Re: VHDL CACHE ?

I looked about SRAM prices. 4MB, 16 bit (so, good for some ST clone as main RAM) 55nS is about 20 Euros. 10nS v. is about 80 Euros, what is too much indeed. Overclocking MMU - but then it will break whole video generation - it will increase horizontal freq. of video and all other. And of course, it ...

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