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Found 4 results

  1. In post #1 of fbForth—TI Forth with File-based Block I/O , I have updated the fbForth 2.0 Manual (a PDF with today’s date) and the blocks file, FBLOCKS (in a ZIP file with today’s date). The ZIP file also contains two disk images (90KiB and 400KiB) with the updated FBLOCKS file. The cartridge binaries for EPROM, Classic99 and MESS are still current except for FBLOCKS, which you can update from the above ZIP file. ...lee
  2. All... I have a first draft (attached) of my updated version of the (now finished---see later or click link-->) TI Forth Instruction Manual in PDF format. I am working on it in Open Office Writer (ODT format), but it won't look right if someone reading it does not have the fonts I used. I think the PDF will work better. I have elaborated parts of the manual, but I have not started an index, yet. One problem with the indexing in OOO Writer is that I have not yet figured out how to sort the index by ASCII codes. Writer wants to put non-alphabetics at the end and I want them as the TI Forth Glossary has them, i.e., in ASCII order. Anyway, I am very interested in any feedback on this draft, particularly where I have added or changed information and whether you think an index would be useful. ...lee
  3. I decided to move my explorations into TurboForth Assembler to a different thread (this one) rather than hijacking another thread. My post here (http://www.atariage....ost__p__2415039) alludes to my current project, viz., implementing Tursi's TMS9900-Assembler-coded 14-bit countdown timer (http://www.atariage....ost__p__2021341) using the TMS9901 Programmable Systems Interface and based on Thierry Nouspikel's code ("TMS9901" link at http://www.nouspikel...titechpages.htm). My two Forth words have the same name as Tursi's TMS9900 Assembler code: INIT01 to start the timer and READ01 to get its current value. My TurboForth Assembler code follows: ASM: INIT01 ( --- ) R12 R2 MOV, \ Save return address R12 CLR, \ CRU base of the TMS9901 0 SBO, \ Enter timer mode R1 $3FFF LI, \ Maximum value R12 INCT, \ Address of bit 1 R1 14 LDCR, \ Load value R12 DECT, 0 SBZ, \ Exit clock mode, start decrementer R2 R12 MOV, \ Restore return address ;ASM ASM: READ01 ( --- n ) R12 R2 MOV, \ Save return address R12 CLR, \ CRU base of the TMS9901 0 SBO, \ Enter timer mode SP INCT, \ Make space on stack to leave timer value *SP 15 STCR, \ Read current value (plus mode bit) and put on stack *SP 1 SRL, \ Get rid of mode bit 0 SBZ, \ Exit clock mode, decrementer continues R2 R12 MOV, \ Restore return address ;ASM Both words seem to compile OK. INIT01 appears to work, but I cannot tell for sure because executing READ01 causes a stack underflow, which baffles me. Any ideas as to what is wrong? ...lee
  4. Pardon my naiveté, but I have a question about the transfer block for the diskette level 1 formatting subprogram (11h). The docs (GPL Interface Specs for 99/4 Disk Peripheral) say the MSN of 834Ch for the DSR version should be 1 for double-sided formatting, but are a little confusing for when 2 should be used, in particular, for density. Is that any density greater than single? More generally, does anyone from experience reading this have detailed advice about exactly what diskette formats can be written with which DSR version numbers in this nybble (presuming, of course, an appropriate version of the DSR is in place)? For example, what happens if the transfer block has DSR version = 0, Density = 2 and No. of Sides = 2? ...lee
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