This repository contains some programs for my STD-85 processor card designed by Craig from Bits of the Golden Age (http://bitsofthegoldenage.org/documentation/std-8085-sbc-v1-x-documentation/)
The STD-85 board is configured with a 6264 SRAM in the M1 socket and an 8264 EEPROM in the M3 socket
The memory map is
| Start Address | End Address | Description |
|---|---|---|
| 0000 | 1FFF | M1 8K SRAM |
| C000 | DFFF | M3 8K EEPROM |
| E000 | FFFF | 256 byte 8155 RAM |
The IO map is configured as
| Start Port | End Port | Description |
|---|---|---|
| 50 | 57 | 7304 dual UART |
| E0 | E8 | 8155 IO |
| F8 | FB | Onboard 8153 |
| FC | FF | Onboard port |
| Bit | Description |
|---|---|
| Q0 | Default/Alternate Memory Map |
| Q1 | MEMEX |
| Q2 | IOEX |
| Q3 | SEG_A, J10-1 |
| Q4 | SEG_B, J10-2 |
| Q5 | SEG_C, J10-3 |
| Q6 | SEG_D, J10-4 |
| Q7 | BUZZER |
| Jumper | Shorted Pins | Description |
|---|---|---|
| J4 | 1, 2 | CLK to 8155 TIMERIN |
| J5 | 1, 2 | Timer out (TO) to INT7.5 |
| SW2 | 7,9 | M1 Default |
| SW3 | 7,9 | M1 Alternate |
| SW6 | x | M2 Default |
| SW7 | x | M2 Alternate |
| SW8 | 1,9 | M3 Default |
| SW9 | 1,9 | M3 Alternate |
| SW10 | 8,9 | 1k Default |
| SW11 | 8,9 | 1k Alternate |
| SW12 | 8,9 | OBP mapped to 4 io ports 0xfc-0xff, 1 needed |
| SW13 | 1,2,9 | 8155 mapped to 8 io ports 0xe0-0xe7, 6 needed |
| wire | SW12-7 | 8153 mapped to 4 io ports 0xf8-0xc, 2 needed |
This assumed the above 1k address range mapping
| SW12 & SW13 Pin | IO Port Range |
|---|---|
| 1 | 0xe0 - 0xe3 |
| 2 | 0xe4 - 0xe7 |
| 3 | 0xe8 - 0xeb |
| 4 | 0xec - 0xef |
| 5 | 0xf0 - 0xf3 |
| 6 | 0xf4 - 0xf7 |
| 7 | 0xf8 - 0xfb |
| 8 | 0xfc - 0xff |
| 9 | Connects to /CE |
This is Version 2 of the Tiny Basic interpreter from Li-Chan Wang.
This is an enhancement of Version 2 Tiny Basic by Anders Hjelm. This version of Tiny Basic was developed to support his micro8085 system as documented in https://hackaday.io/project/176653-micro8085 This basic adds support for PEEK, POKE, INP and OUTP as well as support for talking to SPI EEPROM memory for loading and saving the program.
The version here has been modified to work with the STD-85 board.
This is Version 3 of the Tiny Basic interpreter. This code was reconstructed from the FIXME document as I could not find any version of the assembler code in my searching. The version 3 code incorporates a number of enhancements over the version 2 code.
The eventual aim is to enhance this version with some of the changes from tinybas85
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