Re: [Atari800-users] portb ram extensions

[Jerzy K. <jer...@po...>]

Hi. I'm sorry, my fork is available here: 
https://github.com/mono6502/atari800/tree/ramext_256_576 .
Regards
Jerzy Kut

W dniu 14.12.2024 o 17:33, Jerzy Kut pisze:
> 576 KB Rambo was probably offered by mytek's Atari 576 NUC+.
> Regards
> Jerzy Kut
> 
> 
> W dniu 14.12.2024 o 17:25, Jerzy Kut pisze:
>> Hello.
>>
>> I've added support for a few PORTB managed extram types described in 
>> https://www.virtualdub.org/downloads/ 
>> Altirra%20Hardware%20Reference%20Manual.pdf and http:// 
>> atariki.krap.pl/ index.php/ 
>> Obs%C5%82uga_standardowego_rozszerzenia_pami%C4%99ci_RAM
>> and a new specific type of Rambo extension made nowadays by TFHH (it 
>> was really helpful when we're working on "Mikie" port by Vega).
>>
>> They are:
>> - 192 KB (Karen) - a Compy Shop type extension with 128 KB (8 banks) 
>> of additional memory compatible with 130XE; it was offered in nineties 
>> of XX. century by PZ Karen company, which was official distributor of 
>> Atari for Poland,
>> - 256 KB (Rambo) - a Rambo type extension with 192KB (12 banks) of 
>> additional memory offered in nineties of XX. century by TOMS company 
>> in Poland: http://atariki.krap.pl/index.php/TOMS_260XE
>> - 576 KB (Rambo) - forgive me, I forgot who offers it, but it's 
>> described by Pharaon and the Atariki too,
>> - 576 KB (TFHH) - a Rambo type extension with 512 KB (32 banks) of 
>> additional memory offered nowadays by Jurgen van Radecke: https:// 
>> www.van-radecke.de/STUFF/tfhh_HW_info.pdf
>>
>> These types of ram extensions can be enabled from command line using:
>> -192 (maybe 192xe will be better?)
>> -256
>> -320 (as well as -rambo using so far)
>> -576
>> -576tfhh
>>
>> Additionally more info (mostly useful for developers) is presented 
>> during amount of ram is selected in UI:
>> - separate ANTIC and CPU access (ANTIC-CPU) or common one (ANTIC+CPU)
>> - all bits and their order using to bank selection ("*" marks CPU and 
>> ANTIC enabling bits, "_" bits not used to select bank)
>> - a number of banks.
>>
>> You can see examples on screenshots:
>> - https://mono.i-demo.pl/atari800/ramsize-karen.png
>> - https://mono.i-demo.pl/atari800/ramsize-tfhh.png
>>
>> I've not implemented Newell Industries extensions because I've never 
>> seen them and know only from papers. I've not implemented so called 
>> "Jet extension" which was offered years ago by the scener Jet and was 
>> a bit exotic - only half banks was available for ANTIC, because ANTIC 
>> bit was involved in bank selection - this extension is known by me 
>> only from chats with Polish sceners and I've never seen working 
>> example of it too.
>>
>> I could make pull request with this work.
>> Best regards
>> Jerzy Kut
>