1 - Al Kossow's Bitsavers

TMS46648192·WORD BY 8·BIT READ·ONLY MEMORYCOMMENT CARDSAny number of comment cards may be used for specifying the customer's name, individual to contact, telephone number,address, any special instructions, etc. The format for these cards is as follows: The Letter 'C' (for comment) must be pun·ched in column 1, columns 2 - 4 must be blank, and comments can be punched in columns 5 - 80.START OF DATA CARDThis card is to identify that the next card will be the beginning of customer's code. Format is as follows: Columns 1 -4must have '&ROM' punched in them. The remainder of card is blank.DATA CARDSThere will be 256 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 - 7680InformationHexadecimal 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 ahexadecimal value of '00' to 'FF'.Checksum. The checksum is the negative of the sum of all 8-bit bytes in the recordfrom columns 1 to 70, evaluate modulo 256 (carry from high order bit ignored). Forpurposes of calculating the checksum, the value of columns 5 and 6 are d~fined tobe zero. Adding together, modulo 256, all 8-bit bytes from columns 1 to 70 (columns5 and 6 = 0), then adding the checksum, results in zero.Blank.Card sequence number, in decimal.(right justified).rnQ)(,)'S:Q)c~oa:Texas Instruments reserves the right to make changes at any time in order to improve design and to supply. the best product possible.94TEXASINSTRUMENTSPOST OFFICE BOX 225012 • DALLAS, TEXAS 752657-5