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NMS8280 vwry strange basic math division or multiplication error (defect ??? ) --> OVERFLOW

by marcoexo on 21-12-2017, 23:18
Score: 158.84 %, Type: Forum topic , Comments: 19 comments
FOR I=0 TO &H3FFF: POKE&H9000+I,PEEK(I): NEXT 30 ... was the real problem... What you get, if you type PRINT FRE(0) ? Marcoexo can use TESTRAM, Marcoexo ...

Info request on MSX MAPPER/MEGARAM SD 512 (Belavenuto)

by marcoexo on 12-12-2017, 10:09
Score: 158.81 %, Type: Forum topic , Comments: 6 comments
2.0 User Manual and this information is right into the "Nextor 2.0 Getting Started Guide" ...

ERR 241 from Philips MSX2 Diagnostic ROM ???

by marcoexo on 07-12-2017, 02:08
Score: 158.66 %, Type: Forum topic , Comments: 22 comments
NMS8245 is expanded well...my NMS8245 is expanded to MSX2+ and have a EPROM with the BASIC 3.0. When boots to Basic it shows "Basic 3.0" wich means that it is reading my bios rom If I put ... Pablibiris wrote: well...my NMS8245 is expanded to MSX2+ and have a EPROM with the BASIC 3.0. You ...

How does MSX1 or MSX2 detect main RAM bank ?

by marcoexo on 21-11-2017, 15:42
Score: 158.56 %, Type: Forum topic , Comments: 9 comments
remove just first bank (CAS0) should it be enough to make it start through a 64k slot 1 or 2 expansion ? ... bank (CAS0) should it be enough to make it start through a 64k slot 1 or 2 expansion ? I think with /W joined to GND (with a resistor) is OK. MSX detects ram looking for slot 0-0 to slot 3-0 using ...

-12V usage in Philips MSX?

by marcoexo on 18-11-2017, 01:19
Score: 158.34 %, Type: Forum topic , Comments: 1 comment
I was wondering if there's any use in the main board of the -12v supply voltage. I know that +12v is used by Floppy disk and video stages, but I can't see any usage on -12v , except being routed to the slots. Is it just provided for ...

NMS 8245 black screen repair

by marcoexo on 16-11-2017, 22:32
Score: 158.49 %, Type: Forum topic , Comments: 22 comments
I have this dead NMS8245 , and tested the following using oscilloscope - Clock signal ok on Z80, exists on VDP pin 64 (21 Mhz) but seems a bit flaw and instable, it shows 1,20 vpp and 1.68V max is this normal ? - Address bus ...

How do I activate email alert for posts in which I participate ?

by marcoexo on 16-11-2017, 21:56
Score: 158.42 %, Type: Forum topic , Comments: 3 comments
That might seem idiot to say, but I could not find any option in my profile to receive an email when someone replied to a post in a topic I'm following... At the moment I have to scan the topics to stay informed Am I missing something ? ...

SRAM vs DRAM performance

by marcoexo on 11-11-2017, 00:19
Score: 158.43 %, Type: Forum topic , Comments: 7 comments
I'm going to expand my CX5M by adding a slot 3 expander and set 64k at 3-0, then move the FG05 at 3-1 I'm doing this with the 64K RAM expansion I have, placing the cartridge inside case. The cartridge itself has all the logic for refreshing the DRAM, The alternative is to use two ...

FRUITY ANYONE ?

by marcoexo on 09-11-2017, 20:55
Score: 158.32 %, Type: Forum topic , Comments: 2 comments
I used to play this nice game "Fruity Frank" loading from cassette... I had a copy from ancient times ;-) Now I messed up trying to restore my cassette reader and incidentally deleted a portion from tape... I've been digging on the web ...

WTB NA551760 RGB CARD for CX5M

by marcoexo on 06-11-2017, 00:08
Score: 158.33 %, Type: Forum topic , Comments: 4 comments
Hello, I know that french version of CX5M has RGB output, mine (Italy) has not so I wish to add for better colors. I could replicate the board NA551760 which is described on service manual, But maybe someone has a spare to trade for. Let me know, ...
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