Will a 6502C Sally from a 5200 work in a 1200XL?

[ACML]

I know the GTIA and POKEY on the 5200 are custom with different addresses, but the 6502C Sally should be the same as the 8-bit computers right?

Edited January 19, 2018 by ACML

[Rybags]

Sally 6502 from 5200 and 7800 should be exactly the same as that used on the computers.

 

Antic uses the same addresses as it has the full address bus, no CS pins and does it's own decoding.

 

GTIA and Pokey only use CS pins with the connected address lines only used to select registers to access. Those two should be compatible across all devices that use them.

AFAIK there is one only variant of Pokey. There is PAL and NTSC version of GTIA. Supposedly there was never a PAL CTIA. Unknown if the late buggy GTIAs are only the PAL ones or if NTSC also copped the bad batches.

Edited January 19, 2018 by Rybags

[+slx]

Can a 5200 be converted to PAL the same way the other 8-bits can, i.e. exchanging GTIA, ANTIC and the main system quartz or ist there more to it? (Assuming a composite video out solution is installled at the same time.)

[Rybags]

I think someone's done it (FJC or candle maybe). PAL systems need a second crystal ~ 4.43 MHz which supplies the required clocking for the GTIA colour encoding.

 

If you installed a VBXE and used it as the sole video source then you could probably get away with only changing GTIA and Antic.

Other video solutions - I think you'd still need to do the other stuff.

[Paul Westphal]

It will work.

[Gunstar]

I think someone's done it (FJC or candle maybe). PAL systems need a second crystal ~ 4.43 MHz which supplies the required clocking for the GTIA colour encoding.

 

If you installed a VBXE and used it as the sole video source then you could probably get away with only changing GTIA and Antic.

Other video solutions - I think you'd still need to do the other stuff.

I converted my 1200XL to PAL with PAL GTIA and ANTIC and Dropcheck's GTIA board and a PAL 1.77MHz crystal. The second crystal is on the PAL GTIA board. Which seems to be no longer listed in Bits of The Past shop...but maybe she has more if one asks?

https://www.bitsofthepast.com/?post_type=product&paged=1

Edited January 19, 2018 by Gunstar

[Level42]

Can a 5200 be converted to PAL the same way the other 8-bits can, i.e. exchanging GTIA, ANTIC and the main system quartz or ist there more to it? (Assuming a composite video out solution is installled at the same time.)

I dont zee any reason why you would want to do that with a 5200. All games will be slower. Almost all relatively recent PAL CRT TVs and LCDs accept 60hz input so unlike with the A8 computers that can run more recent PAL games and demos, there is really little reason in converting 5200s to PAL.

[_The Doctor__]

consider it easy mode like back in the old days?

[Rybags]

Another potential issue might be that some games won't work. The 2-port machine's BIOS checks a cartridge flag on PAL systems, location $BFE7 on the Rom has to be set to $15, $30 or have bit 1 set otherwise the console won't run it. If an NTSC GTIA is present the check is bypassed.

[+CharlieChaplin]

Yes, for older Atarians with slow reactions (like e.g. me!) and/or bad players (e.g. me!) its quite good having games running slower. For that reason I prefer running some NTSC versions on my PAL machines (e.g. Yoomp-NTSC allthough a PAL version exists). They should have coded Elektra Glide and some other games on NTSC machines, because I could then run them slower on my PAL Ataris...

[Kyle22]

I dont zee any reason why you would want to do that with a 5200. All games will be slower. Almost all relatively recent PAL CRT TVs and LCDs accept 60hz input so unlike with the A8 computers that can run more recent PAL games and demos, there is really little reason in converting 5200s to PAL.

So, does this mean that I can use a newer PAL monitor and GTIA + crystal with an NTSC 60Hz ANTIC in my computer?

[+David_P]

I know the GTIA and POKEY on the 5200 are custom with different addresses, but the 6502C Sally should be the same as the 8-bit computers right?

Actually, it's the exact same chip, only the glue logic maps it into a different spot in the memory map.