Guru
Joined: 05/10/2019
Location: United KingdomPosts: 8955
| Posted: 09:20am 25 Aug 2024 |
PSRAM isn't all that fast. It's somewhere between RAM and flash, apparently, so it wouldn't be as fast as a true RAM disk unless the fetch was for something already in its cache.
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I used to use a RAM disk on the old Nascom-1. As the Z80 was restricted to a 64K memory space add-on boards were designed to handle bank switching. They could get hairy! By twiddling bits in two of the Z80 ports (which take up no memory space) you could switch in one page for read and a different one for write at the same address, If the Write page was the screen you could "rapidly" (we are talking original 2MHz Z80 here, so not really!) blit images onto it using LDIR from and to the same address. If anyone has seen Tandy's Dancing Demon they'll know the sort of thing.
Hardware hacking when you had to know about address & data buses, M1 cycles, IORQ etc. was fun. :)
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Edited 2024-08-25 19:21 by Mixtel90