If you needed 141 bytes of zero page on a C-64, what addresses would you use?BASIC is switched out, Kernal is still switched in, so anything BASIC uses can
On a PET (4.0 ROM) I'm just using $00-$8C (everything below jiffy clock) andthere's a little ML routine ('aloha') to swap the half page in and out, but I want to port PETTIL to the C=64
On Thursday, August 10, 2017 at 3:48:55 PM UTC-4, chitselb wrote:use? BASIC is switched out, Kernal is still switched in, so anything BASIC uses can be reallocated. Having it all be contiguous so I can go in and out of
If you needed 141 bytes of zero page on a C-64, what addresses would you
and there's a little ML routine ('aloha') to swap the half page in and out, butOn a PET (4.0 ROM) I'm just using $00-$8C (everything below jiffy clock)
On a C64, the BASIC ROM uses ZP addresses $02-$8F, but you can use kernal ZPlocations you don't need in your program. For example, $83-$8B and $AE-$B6 are
It looks like what they did is put the memory mapping I/O port at $00-$01 andmoved everything up by two? Does it still have the problem of occasionally pooping on address $10 ? There are a couple of places in the PET ROM where writes to $10 occur e.g.
Sysop: | Nelgin |
---|---|
Location: | Plano, TX |
Users: | 510 |
Nodes: | 10 (1 / 9) |
Uptime: | 117:15:33 |
Calls: | 8,198 |
Calls today: | 5 |
Files: | 15,442 |
Messages: | 913,406 |
Posted today: | 8 |