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Yeah, you had ROM space (and potentially cartridge ROM space) eating into your 64K on all the models and had to bank-switch for anything more than 48K IIRC. Wi
by buescher 5y ago
Yeah, you had ROM space (and potentially cartridge ROM space) eating into your 64K on all the models and had to bank-switch for anything more than 48K IIRC. With a BASIC cartridge in place you'd lose another 8K.
Also I don't recall any of the 400/800 3rd party upgrades being compatible - they used a different bank-switching mechanism - with the later XL/XE models.
- michaelcampbell 5y ago"bank switching" sounds familiar, so I'm pretty sure my memory of 64k is correct then. I can't say I understand what it means, but I remember something of that term at the time.
- bluGill 5y agoYou group your memory into groups of 16k (could be other sizes, 16k is what I recall but it has been years). Then you have a switch that you can program the switches between groups (also called banks). You can only access one at a time, but you can switch between them very fast. It was possible to get up to 5 MB of memory that way, even though you could only use 64K at a time.