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  1. Hi, can the experienced programmers confirm if the following statements are true and I understood the topics correct? The background is that I am working on a tool TIcode99 and would like to get it reading in 99xx(x) source code files correct. Special operand types [CruBit <cnt>, Xop <xop>, ShiftCount <scnt>] - If an opcode requires a numeric input for an operand, the sourcecode can define the number as decimal or hexadecimal. - If an opcode requires a numeric input for an operand, the sourcecode can always define a symbol (EQU opcode) and refer the symbol name instead of a direct numeric input - If an opcode requires a numeric input for an operand, the sourcecode can refer a Workspace Register instead (like 'SLA R5,R0'). However not the value of the Workspace Register is used but the number of the Workspace Register - for these operand types I can not use '1+2' as operand. Immediate operand type <iop> - If I define a Symbol, I can refer the symbol as immediate operand. Here I can also use a symbol reference like below to define an immediate operand. -SYMB1 SYMB1+2 SYMB1*256 SYMB1+SYMB2 All of these examples don't work for the operand types CruBit <cnt>, Xop <xop>, ShiftCount <scnt>. - Below instruction is not supported on the TI-99 Editor Assembler, but probably on the TI-990 Assembler (SDSMAC). LI R1,MF1+(>F*4) I assume it can be translated to? LI R1,MF1+>FFFF Questions about the Immediate Operand type: 1. What does this instruction mean? CI R0,@ENDDAT ... ENDDAT EQU $ It fails for me in the EA, never the less the 99/8 source code uses such code in DEBUGG. Other example: PAR02 CI R8,@INTEG$*256 ... INTEG$ EQU >AE 2. How can a String be useful as immediate Value? 'E' 'I'-'0' -'0' '--' '-'*256 I don't understand the usecase when to use a String like shown as Immediate operand. How are these "translated" into a numeric value? Symbol operand type <symbol> This operand type is a bit unclear to me. Afaik this i used by opcodes DEF, REF, SREF, LOAD, DXOP, END and DFOP. Should this solely allow the definition/reference of a symbol? Or should I be able to use something like "SYMB1+2" or other 'expressions'? Workspace operand type <wa> XPTL EQU 6 SRL XPTL,8 Since this works, it seems I can use a Symbol instead of a direct reference of one of the Workspace Register. Is it translated to Shift R6 by 8 to the right? However I can not use "XPTL+2" for that operand. Expression operand type <exp> It is quite clear that wherever the syntax definitions says here should be an <exp> as operand type it allows an expression to be used. However it seems that the Immediate operand type <iop> and the General Address operand types <gas>,<gad> are heavily using expressions as well. Is the assumption correct, that every expression has to result in some number (address) during assembling time? General operand type <gas>, <gad> I see sometimes an operand looking like indexed memory addressing, however the @ sign is not there. WRTADD EQU >402 ... MOVB R4,WRTADD(R9) Any explanations on why this is missing the @ sign? Many thanks for your help in advance.
  2. First, I have a Mini Memory, but after fighting with it for a week, I cannot seem to work out exactly how to create something that will work with Extended Basic & a 32K RAM expansion. So, I've been looking to buy the Editor Assembler package (cart, disks, manual, ref, & keyboard overlay/slip.) Though that might take a while. Until then, I've been working with several emulators to try and get some practice in. The problem is that I cannot seem to write anything that will work. I tried entering a program from the "Introduction to Assembly Language for the TI Home Computer" book available elsewhere here, but it still wouldn't run. I tried the code exactly as written in the TI Basic option of the Editor/Assembler cartridge. I also tried adding in EQU instead of REF for the 2 calls (VSBW & VMBW,) in Extended BASIC. The example program ran fine with (3 Load and Run) from E/A (with the return altered by decrementing twice to freeze at the end.) Am I missing some important step? My code included... It's just a simple program to place text at a specific screen location. IDT 'HSTR' * MAY NOT BE NECESSARY, BUT DOESN'T HURT DEF HSTR VMBW EQU >2024 XMLLNK EQU >2018 NUMREF EQU >2000 *ALSO TRIED REMOVING ALL THESE AND USING STRREF EQU >2014 * COPY "DSK2.XB-EQUATES GPLWS EQU >83E0 *WHICH I PAINSTAKINGLY COPIED FROM THE STATUS EQU >837C *EDITOR/ASSEMBLER MANUAL (WITH CORRECTIONS) CFI EQU >12B8 *ALSO TRIED VALUES FROM A COMPUTE! BOOK FAC EQU >834A USRWS BSS 32 BUFFER BSS 256 SAVRTN DATA >0000 EVEN HSTR MOV R11,@SAVRTN LWPI USRWS CLR R0 LI R1,1 BLWP @NUMREF BLWP @XMLLNK DATA CFI DEC @FAC LI R3,32 MPY @FAC,R3 INC R1 BLWP @NUMREF BLWP @XMLLNK DATA CFI DEC @FAC A @FAC,R3 INC R1 LI R2,>FF00 MOVB R2,@BUFFER LI R2,BUFFER BLWP @STRREF MOV R3,R0 MOV R2,R1 MOVB *R1+,R2 SRL R2,8 BLWP @VMBW LWPI GPLWS MOV @SAVRTN,R11 CLR @STATUS B *R11 * ALSO TRIED RT END
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