openMSX reports

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By HansO

Paladin (672)

HansO's picture

29-11-2004, 21:28


-PHILIPS VG-8020: in the implementation of this machine, openMSX considers that this computer has a memory mapper and only 64 KB. I know that this has been discussed in the past, but until now I have never found any VG-8020 with a mapper, and I owe 4. Perhaps it would be good to include the "mapped version" and "unmapped version" (64 KB RAM in third slot).

The VG8020/00 version is on the outside identical to later version VG8020/20. Internally not: the /00 is build like a traditional MSX-1 computer with separate chips, later versions use the S3527 MSX engine. The /00 has no mapper, the /20 has 64K in a mapper provided by the S3527.

By BiFi

Enlighted (4348)

BiFi's picture

08-12-2004, 12:12

Does the VG8020/20 Main ROM also contain code to initialize the memory mapper banks? It's the first time I read/hear about an MSX1 computer having a memory mapper.

By Manuel

Ascended (15359)

Manuel's picture

16-12-2004, 09:24

Hmm, I thought the 8020/20 didn't have a mapper, but just 64k in an expanded slot: 3-2. (I.e.: you need POKE -1,170 to select it for some software....) Oh, I already said this earlier, I see... Smile

There are MSX1 machines with a mapper, though: an example is the Yamaha CX-5MII/128. 128kB mapper.

By HansO

Paladin (672)

HansO's picture

16-12-2004, 11:12

Hmm, I thought the 8020/20 didn't have a mapper, but just 64k in an expanded slot: 3-2. (I.e.: you need POKE -1,170 to select it for some software....) Oh, I already said this earlier, I see... Smile

You are right, the 64K is in a expanded slot but not in a mapper.

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