a8. lists software which can use 130XE-style memory expansions. The Atari 8-bit FAQ section 6.11 covers memory expansion boards. Some expansions include a replacement 16-bit CPU, the 65816, which has a default 6502-compatible mode but has 24 address lines and can be used to access up to 16MB of RAM. Expansions end up being most useful as RAM disks. (This is mostly games and demos though.) There were various switching standards, and some modern boards support different approaches you’ll find mentions such as “RAMbo 320KB”, “CompyShop 576KB” and “RAMbo 1088KB”. “Standard” software doesn’t know about it, but there is some software which does any software which could benefit from a 130XE would know how to use bank switching. 4 MB is the maximum possible, using 256 16 KB banks (with 8 selection bits). the Ultimate 1MB (which isn’t just a memory expansion). There were many different memory expansions sold back when 8-bit Ataris were current, and there are still a few varieties available now - e.g. Memory expansion modifications typically involve adding a bank-switching chip and memory chips, and use more bits for bank selection. (That PIA port was used for the third and fourth joystick ports on the Atari 400 and 800 memory expansion beyond 52KB on those involved other bank-switching schemes. bit 7 enables or disables the self-test ROM, from 0x5000 to 0x57FF disabling it gives back 2 KB of RAM.bit 6 enables or disables the Missile Command ROM on XEs, at the same locations as the BASIC ROM TuneSmith - The Essential Songwriting Companion Idolumic LLC 361 subscribers Subscribe 7.1K views 4 years ago Pair Rhyme Genie with TuneSmith and get the most comprehensive set of tools.bits 4 and 5 control CPU/ANTIC access (the CPU and ANTIC can bank-switch independently, which makes sense since ANTIC has its own RAM ports).
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