TU58 tape formatter (was Re: rebuilding DC100A cartridges?)

Eric Smith spacewar at gmail.com
Wed Nov 14 11:33:32 CST 2018

On Wed, Nov 14, 2018 at 8:53 AM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:

> On Sat, Nov 24, 2012 at 4:08 AM Eric Smith <eric at brouhaha.com> wrote:
> > I spent some time reverse-engineering the firmware.  There is only one
> > undocumented opcode, decimal 10, and I haven't yet figured out what it
> > does, but it definitely doesn't format a tape.
> I looked at the firmware disassemblies.  Opcode 10 appears to only
> point to code (vs NOP) on one version of the firmware
> https://gitlab.com/NF6X_Retrocomputing/tu58firmware/blob/master/disassembly/23-089e2.asm

Well, yes, that's my disassembly. So now you know about as much about
opcode 10 as I do.  :-)

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