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==== Table of Contents ====

[[#g8ppbase_8085|G8PPBase + 8085]]

[[#introduction|Introduction]]

[[#cpu_card|8085 CPU Card]]

[[#prototype_8085_cpu_card|Prototype 8085 CPU Card]]

[[#rc2014_signal_definition|RC2014 Signal Definition]]

[[#g8pp_baseline_configuration|G8PP Baseline Configuration]]

[[#g8ppbase_80851|G8PPBase+8085]]

[[#manuals_and_instructions|Manuals and Instructions]]

====== G8PPBase + 8085 ======

===== Introduction =====

This is a two-board configuration consists of a [[builderpages:plasmo:g8pp:g8ppbase|G8PP in baseline configuration]] and a simple 8085 CPU board on RC2014 backplane.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=2094a7&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/dsc_41501231.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=600&h=399&tok=9b4ae7&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fg8pp%2Fg8pp8085%2Fdsc_41501231.jpg?600x399|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_dsc_41501231.jpg}}]]

===== 8085 CPU Card =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=62c105&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/cpu8085_comp.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=400&h=159&tok=22fc5f&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fg8pp%2Fg8pp8085%2Fcpu8085_comp.jpg?400x159|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_cpu8085_comp.jpg}}]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:cpu8085_scm.pdf|Schematic]] of PCB 8085 CPU card

Gerber [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:cpu8085_r1.zip|photoplots]] of 8085 CPU card

Engineering change of PCB 8085 CPU card

A 1K pull-up resistor is required between X1 input and VCC so clock input swings from 0.8V (low) to 4.0V (high). At the solder side of PCB, install a 1/8 1K resistor between pin 1 (X1) and pin 40 (VCC) of 8085

==== Prototype 8085 CPU Card ====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=64fb4b&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_comp.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=250&h=110&tok=2cd0d5&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fg8pp%2Fg8pp8085%2F8085_cpu_comp.jpg?250x110|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_8085_cpu_comp.jpg}}]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=ff94e5&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/builderpages/plasmo/g8pp/g8pp8085/8085_cpu_solder.jpg|{{https://www.retrobrewcomputers.org/lib/exe/fetch.php?w=250&h=108&tok=44acd7&media=https%3A%2F%2Fwww.retrobrewcomputers.org%2Flib%2Fplugins%2Fckgedit%2Ffckeditor%2Fuserfiles%2Fimage%2Fbuilderpages%2Fplasmo%2Fg8pp%2Fg8pp8085%2F8085_cpu_solder.jpg?250x108|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_builderpages_plasmo_g8pp_g8pp8085_8085_cpu_solder.jpg}}]]

This is a prototype of the 8085 CPU card. It is superseded by the PC board version.

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:8085_cpu_scm.pdf|Schematic]] of prototype 8085 CPU card

===== RC2014 Signal Definition =====

The following RC2014 signals are redefined for G8PPBase+8085

RC2014 Pin 19 (nM1) — ALE (8085 pin 30)

RC2014 Pin 23 (nMREQ) — IOnM (8085 pin 34)

RC2014 Pin 24 (nWR) — nWR (8085 pin 31)

RC2014 Pin 25 (nRD) — nRD (8085 pin 32)

RC2014 Pin 26 (nIORQ) — INTA (8085 pin 11)

RC2014 Pin 37 (Spare 1) — HLD (8085 pin 39)

RC2014 Pin 38 (Spare 2) — RDY (8085 pin 35)

RC2014 Pin 39 (Spare 3) — TRAP (8085 pin 6)

===== G8PP Baseline Configuration =====

Introduction to [[builderpages:plasmo:g8pp|G8PP]]

G8PP [[builderpages:plasmo:g8pp:g8ppbase|baseline configuration]]

Altera [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8ppbase8085_cpld_1_8_19.zip|EPM7128SQC100 design for 8085]]

===== G8PPBase+8085 =====

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp8085load_1_8_19.zip|Serial Bootstrap]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp8085mon_1_14_19.zip|8085 Monitor]]

[[https://www.retrobrewcomputers.org/lib/exe/fetch.php?media=builderpages:plasmo:g8pp:g8pp8085:g8pp_8085_cpm22all.zip|CP/M-2.2]] BIOS/CCP/BDOS

CP/M 2.2 distribution files

===== Manuals and Instructions =====

Getting started with G8PPBase+8085 ←configure altera epm7128, load bootstrap, load 8085 monitor, load cp/m

8085 Monitor manual