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updated CDFJ+ driver description

This commit is contained in:
Thomas Jentzsch 2022-02-26 19:04:15 +01:00
parent 3cfb79ca68
commit 12e1b3c04f
1 changed files with 5 additions and 6 deletions
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11
src/emucore/CartCDF.hxx
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@ -39,15 +39,14 @@ class System;
7 banks (4K) of atari code
4K display data (16K and 32K available with CDFJ+)
Note that for CDFJ+ the programmer must ensure that only the available RAM/ROM on the target device is
used. There are 2 versions of the driver, with minor changes due to hardware.
Note that for CDFJ+ the programmer must ensure that only the available RAM/ROM on the target
device is used. There are 2 versions of the driver, with minor changes due to hardware.
1) 32K ROM and 8K RAM - compatible with 48-Pin LPC210X Family (Harmony, Harmony Encore, Melody)
2) 64/128/256/512K ROM and16/32K RAM - compatible with 64-Pin LPC213X Family
The CDFJ+ driver can be modified to also override LDX # and LDY # for fast fetcher use. Additionally
an offset can be set for the Fast Fetchers - if the offset was set to $80 then LDA #$85 would do a fast fetch
of datastream 5. As implemented Stella's CDFJ+ support expects these to have been set in the driver ahead
of time, though In theory they could be done at run time.
The CDFJ+ driver can be modified to also override LDX # and LDY # for fast fetcher use.
Additionally an offset can be set for the Fast Fetchers - if the offset was set to $80 then
LDA #$85 would do a fast fetch of datastream 5.
Bankswitching Note:
CDF/CDFJ uses $FFF5 through $FFFB (initial bank 6)