Re: [fuse-emulator-devel] Emulation of some Romanian clones

[Alex B. <vam...@gm...>]

Hi,

On Fri, Aug 10, 2012 at 12:06 AM, Alex Badea <vam...@gm...> wrote:
> == Code ==
>
> I've written a proof-of-concept hack[2] for fuse which adds i8272
> support to IF1 code.  In conjunction with the HC IF1 ROM it can
> successfully emulate floppy access from BASIC, including the use of
> disk images dumped from real disks.  Of note, the IF1 controls the
> i8272 Terminal Count (TC) input, and relies on its proper operation;
> support for this was added to upd_fdc.
>
> There are a couple of design choices where I'd like to ask for advice.
>
> 1) How do we implement the floppy-flavoured IF1?
> 1A) implement a whole new peripheral type, with its own paging routines, etc.
> 1B) add a switchable mode to the existing IF1 code, allowing to choose
> between microdrive and floppy
>
> 2) Should we create new machine types for these clones?
> 2A) Yes (presumably one for each model)
> 2B) No, we would simply have some peripherals which can be manually
> enabled on top of spec48
>
> Any and all other feedback is greatly appreciated.

For now, I took the easy way out and prototyped a patch series[1]  for
solutions 1B and 2B.  This is pretty much full HC90 (non-CP/M)
support, except for saving IF1 FDC state in snapshots.

Brief instructions for anyone wishing to try this out:

# clone and build
git clone -b hc-if1-v3 git://github.com/vamposdecampos/fuse-emulator-svn.git
cd fuse-emulator-svn/fuse
./configure && make
# get the IF1 ROM, trim it to 8K
wget -O hc2k_old.zip
https://sites.google.com/site/georgechirtoaca/HC2K_OLD.ZIP?attredirects=0
unzip hc2k.zip  if1_old.rom
dd if=if1_old.rom of=if1_trunc.rom bs=8192 count=1
# run
./fuse -m 48 --rom-interface-i=if1_old_trunc.rom --interface1  --interface1-fdc
# menu: Media, Disk, HC Interface 1, Drive 1, Insert New
# on the speccy:
FORMAT "d";1
SAVE *"d";1;"test"
CAT 1


Cheers,
Alex


[1] https://github.com/vamposdecampos/fuse-emulator-svn/commits/hc-if1-v3

Alex Badea (15):
      upd_fdc: implement Terminal Count support
      debugger: add support for setting IM and IFFs
      gtk debugger: use MEMORY_PAGE_SIZE instead of hard-coded 4k
      disk: allow reading/writing mgt layouts of 80x16x256 and 40x16x256
      memory: change page size from 4k to 1k
      Add skeleton if1_fdc peripheral
      if1_fdc: add periph type and setting for enabling it
      if1_fdc: add 1kB RAM
      if1_fdc: add if1_fdc_available flag
      if1_fdc: create an i8272 / uPD765 FDC
      if1: disable microdrive I/O if if1_fdc is enabled
      if1_fdc: hook up i8272 to I/O ports
      if1_fdc: add UI and drive type settings
      if1_fdc: hook up media menu items
      if1_fdc: emulate 555 timer for fdd deselection

 fuse/debugger/command.c         |   18 ++
 fuse/debugger/commandl.l        |    3 +
 fuse/fuse.c                     |    1 +
 fuse/machines/machines_periph.c |    1 +
 fuse/memory.h                   |    2 +-
 fuse/menu.c                     |   22 ++
 fuse/menu_data.dat              |   26 +++
 fuse/periph.h                   |    1 +
 fuse/peripherals/Makefile.am    |    2 +
 fuse/peripherals/disk/disk.c    |   10 +-
 fuse/peripherals/disk/upd_fdc.c |   44 +++--
 fuse/peripherals/disk/upd_fdc.h |    2 +
 fuse/peripherals/if1.c          |   14 ++-
 fuse/peripherals/if1_fdc.c      |  401 +++++++++++++++++++++++++++++++++++++++
 fuse/peripherals/if1_fdc.h      |   23 +++
 fuse/settings.dat               |    3 +
 fuse/ui.c                       |   62 ++++++-
 fuse/ui/gtk/debugger.c          |    2 +-
 fuse/ui/options.dat             |    3 +
 fuse/ui/ui.h                    |   10 +
 20 files changed, 630 insertions(+), 20 deletions(-)