Daewoo CPC-400S hanja display bug.

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By Manuel

Ascended (15763)

Manuel의 아바타

01-06-2019, 15:57

Masked writes to the low and high address ports, respectively:

SCREEN9:WIDTH64: 00, 02

PRINT CHR$(&HD0);CHR$(&H65): 26, 2a; 15, 29

When I do SHIFT-SELECT, I first see: 26, 2a
when then entering D065, I see: 07, 07

So, something different is written to the I/O ports. But why? And why the 26, 2a sequence?

By masquane

Supporter (6)

masquane의 아바타

03-06-2019, 14:14

Manuel wrote:

The next development build (and the current source code) has this fix included. Please test and confirm! Smile

Wow, The garbled characters of CPC-400/400S demo disk have been fixed! Big smile

By Manuel

Ascended (15763)

Manuel의 아바타

03-06-2019, 22:13

Great to hear that! Now the question about SHIFT-SELECT... do you someone with a real CPC-400S who can test?

By masquane

Supporter (6)

masquane의 아바타

04-06-2019, 13:55

I think primary slot 2 mem size is not 0x8000 but 0x4000. Smile

By Manuel

Ascended (15763)

Manuel의 아바타

04-06-2019, 21:37

masquane wrote:

I think primary slot 2 mem size is not 0x8000 but 0x4000. Smile

It depends. For some reason we/I thought that the diskROM is mirrored also in page 2. We'd need a 64kB dump of slot 2 before we can be certain.

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