{"id":10,"date":"2007-12-30T23:46:05","date_gmt":"2007-12-30T21:46:05","guid":{"rendered":"http:\/\/www.bkits.at\/weblog\/?page_id=10"},"modified":"2010-04-22T15:29:19","modified_gmt":"2010-04-22T13:29:19","slug":"useful-memory-addresses","status":"publish","type":"page","link":"http:\/\/www.bkits.at\/weblog\/the-sharp-pc1403h\/useful-memory-addresses\/","title":{"rendered":"Useful memory addresses"},"content":{"rendered":"

Unfortunately I neither know the memory address scheme of the PC1403 – any suggestions would be appreciated – nor the ROM code. The following information was found out by try and error.<\/p>\n

The addressing schematics look very similar to common 8 bit systems, e.g. like the Commodore 64 home computer. If so, the so called ‚zeropage<\/a>‚, the first 1024 bytes of address space, should be handled carefully.<\/p>\n

Anyway, to prevent you from inventing the wheel again, take a look!<\/p>\n

Accessing the display<\/h4>\n

Even the display is very small (5x7x24), you can access every block on the display, and very confusing, the special functions-display.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Bit \/ address<\/th>\n12348<\/th>\n12349<\/th>\n12412<\/th>\n<\/tr>\n
1<\/th>\nJapenese symbols<\/code><\/td>\n\/<\/code><\/td>\nE<\/code><\/td>\n<\/tr>\n
2<\/th>\nJapanese symbols<\/code><\/td>\nDEF<\/code><\/td>\nM<\/code><\/td>\n<\/tr>\n
3<\/th>\nSML<\/code><\/td>\nSHIFT<\/code><\/td>\n()<\/code><\/td>\n<\/tr>\n
4<\/th>\n(STAT)<\/code><\/td>\nHYP<\/code><\/td>\nRAD<\/code><\/td>\n<\/tr>\n
5<\/th>\n(MATRIX)<\/code><\/td>\nPRO<\/code><\/td>\nG<\/code><\/td>\n<\/tr>\n
6<\/th>\n(BASIC)<\/code><\/td>\nRUN<\/code><\/td>\nDE<\/code><\/td>\n<\/tr>\n
7<\/th>\nleft _<\/code><\/td>\nCAL<\/code><\/td>\n(PRINT)_<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

To calculate the value, that needs to be poked, use: 2^(Bit-1)<\/code> for setting the bit, e.g. to activate „SML<\/code>“ on the display, simply use<\/p>\n

POKE 12348,4<\/code>.<\/p><\/blockquote>\n

As long as bit arithmetics is additive and the POKE<\/code> command increases the memory address automatically, a<\/p>\n

POKE 12348,255,255<\/code><\/p><\/blockquote>\n

makes your PC1403 display looking very crazy. A virus? Magic? No, not really, of course…<\/p>\n

Password switch<\/h4>\n

Protecting your source code from foreign eyes is a nice little feature, but not very secure. Use<\/p>\n

POKE 65300,32<\/code><\/p><\/blockquote>\n

to enable password protection,<\/p>\n

POKE 65300,1<\/code><\/p><\/blockquote>\n

for disabling. Also look at the source section, how you can find out the whole password string.<\/p>\n

For some source code samples, take a look at those articles<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Unfortunately I neither know the memory address scheme of the PC1403 – any suggestions would be appreciated – nor the ROM code. The following information was found out by try and error. The addressing schematics look very similar to common … Weiterlesen →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"parent":7,"menu_order":0,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-10","page","type-page","status-publish","hentry"],"yoast_head":"\nUseful memory addresses - Berni's ~page V5 Weblog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.bkits.at\/weblog\/the-sharp-pc1403h\/useful-memory-addresses\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Useful memory addresses - Berni's ~page V5 Weblog\" \/>\n<meta property=\"og:description\" content=\"Unfortunately I neither know the memory address scheme of the PC1403 – any suggestions would be appreciated – nor the ROM code. 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