SDC_85

The smallest DIL40 8085-based computer

gbm

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DIL40 footprint, 32 KiB RAM, 64 KiB ISP Flash, console via USB VCOM, full hardware monitor.

Features:

footprint: 80C85 DIL40 socket (width: + 50 mils)
hardware monitor with single-stepping, disassembly, memory editing and drag-and-drop HEX file loading
32 KiB RAM, 64 KiB ISP Flash
terminal (console) interface with interrupt capability
timer with interrupt and single LED controlled via an output port
SOD output connected to a LED, SID input controlled by a button or monitor command
Power supply, h/w monitor communication and target computer terminal via USB double VCOM device
whole computer logic implemented in STM32L412C microcontroller placed under the CPU

Software needed on PC side: a terminal emulator program (TeraTerm 4.101 or newer is recommended).

sdc_85b.png Revised schematic w/ corrected LED control by SOD output. Portable Network Graphics (PNG) - 47.87 kB - 02/20/2019 at 19:24	Preview	Download

It's stable now
gbm • 02/19/2019 at 11:49 • 0 comments

Fixed the timing problem related to clock generation, looks like the machine works stable now and TinyBASIC doesn't break..
Mostly working
gbm • 02/06/2019 at 19:21 • 0 comments

The SDC_85 runs TinyBASIC for 15 minutes, then the BASIC goes wild. Looks like some memory corruption - needs sorting out.