101 lines
3.5 KiB
Plaintext
101 lines
3.5 KiB
Plaintext
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==== Non-functioning Apple II Software (that should work) ====
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* Rescue Raiders? Usually launches, but sometimes re-boots mysteriously.
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(Could just be the disk image I'm using.)
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* Stellar 7? Seems okay now, but wasn't working earlier.
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* Apple Panic, GraForth. Something wrong with our keypress buffering?
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==== CPU ====
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* Find quicker Z-flag query expression? (Rethink ZF flag.)
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* Use rotated opcodes: op<<6 | op>>2 ?
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* Keep A in a local variable?
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* Implement old 6502 ADC & SBC behavior (different flags than 65c02)
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* Video floater bytes not correct yet.
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* On ][ and ][+, RESET should not affect the language card state.
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* Keep 'scanLine' in upper bits of 't', instead of extra variable.
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* Peripheral expansion ROMs not being swapped in correctly.
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==== Video ====
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* Review D/HGR rendering. Glitches still apparent?
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* Support European screen glyphs.
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* Support European (PAL) color palette.
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* Implement the "bizarre" (and useless) GR video mode?
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* Simulate color burst for text in graphics mode.
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* Implement Videx 80-column card for IIo and IIp models?
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* Eliminate need to scale array index by 4 when using 'vpix' tables?
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==== Audio ====
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* Add Mockingboard emulation.
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* Add sound effects to printer and disk drive activity.
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* Support cassette tape input? Probably not worth it.
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* There are occasional pops in the audio output.
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==== Disk Drives & Image Files ====
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* Support BZ- and GZ-compressed disk image files.
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* Use track size of 6384-6400 bytes instead of 6656?
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* Infer DO/PO format of 140K disks by examining their contents.
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* On computer Reset, does the IWM mode register revert to 0?
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* Update checksum on modified DiskCopy 4 images.
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* Does IWM mode register change after RESET?
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* Support FDI disk images? NB2?
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* Forbid Disk II drives accepting 2IMG-PO disks > 140 KB.
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* On real Apple II with IWM, verify IWM status register value under all
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possible drive contents: none, read-only, read-write.
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* Failure to load a drive should _not_ empty it?
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* Need to regularize NIB tracks when loading?
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==== Printer ====
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* Not processing rubout characters ($7F) yet.
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* The Flex scanner is not re-entrant, and not thread-safe. Use 're2c'?
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* Output PS should be friendly to A4 paper sizes, and PDF distilling.
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* Use PDF-lib library for printing to PDF?
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* Preferences:
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LF after CR, yes or no
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7 or 8 bit data path
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card DIP switch states
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page size US Letter or A4
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line width 40 or 80
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* Epson emulation:
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Ibsen font bounding boxes needed
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Tab stops are not always a constant width.
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Graphics character set; European character sets.
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Handle rubout and backspace characters properly.
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Vertical tabs not handled.
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==== Model-specific Features ====
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* The IIc+ doesn't work yet. Worth bothering with?
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* IIc: provide a 40/80 column switch?
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* IIc: detect various ROM versions, an act appropriately. In particular,
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the mouse firmware can be in slot 4 or 7, the number of ROM banks can
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be either 1 or 2, and expansion RAM might or might not be available.
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* IIc: reading $C048 should reset the X0/Y0 interrupt flags.
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==== Miscellany ====
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* State saving and restoring!
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* The Apple ][ and ][+ are wasting 64KB for aux. RAM that's never used.
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* Add Z80 and CP/M support?
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* Emulate RAMWorks card? ThunderClock?
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* Use ObjC exceptions instead of error codes? (Requires MacOS 10.3+)
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How about using NSError?
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* Use NSFileHandles or NSStreams instead of Unix FDs and FILE pointers?
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* Add Apple II mouse support.
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* Implement the Parallel Interface Card? It's much simpler than the SSC.
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* Eliminate non-POSIX calls?
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* Have different models inherit from a base class?
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* Save and restore NSUserDefaults for the library.
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