1 - Al Kossow's Bitsavers

TMS4712816,384·WORD BY 8·BIT READ·ONLY MEMORYDATA CARDSThere will be 512 data cards supplied for each customer code. Each card will contain (in hexadecimal) the data for 32 memorylocations. Each data card shall be in the following format:Card Column1 - 45,67 - 7071,7273 - 7677 - 80InformationHexadecimal address of first word on the card, four bits in length.Blank.Data. Each 8-bit data byte is represented by two ASCII characters to represent a hexadecimalvalue of '00' to 'FF'.Checksum. The checksum is the negative of the sum of all 8-bit bytes in the record fromcolumns 1 to 70, evaluate modulo 256 (carry from high order bit ignored). For purposesof calculating the checksum, the value of columns 5 and 6 are defined to be zero. Addingtogether, modulo 256, all 8-bit bytes from column 1 to 70 (columns 5 and 6 = 0), thenadding the checksum, results in zero.Blank.Card sequence number, in decimal (right justified).:xJo3:cCD