Difference between revisions of "Heathkit H8"
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File:H8-4 Multi Port Serial IO as Received.jpg | File:H8-4 Multi Port Serial IO as Received.jpg | ||
</gallery> | </gallery> | ||
| + | |||
| + | ==Notes== | ||
| + | ===Boot from Older ROM=== | ||
| + | From a discussion on the SEBHC google group [https://groups.google.com/g/sebhc/c/ub92uvlVRP0/m/-wj0DbD8AAAJ Glenn instructs] on how to boot an older ROM. | ||
| + | <syntaxhighlight lang="text"> | ||
| + | You must have an early ROM. It was only later that Heath added single key boot (the early ROMs were developed before the H17 existed). | ||
| + | To boot you must set the Program Counter register manually to 030.000 and then hit GO, so: | ||
| + | |||
| + | REG (decimal points light up...) | ||
| + | PC (the “F” key, same as PC) | ||
| + | ALTER (the “D” key; decimal points flash) | ||
| + | 0 3 0 0 0 0 | ||
| + | ALTER (decimals stop flashing...) | ||
| + | GO (the “4” key) | ||
| + | </syntaxhighlight> | ||
==Documentation== | ==Documentation== | ||
Revision as of 19:24, 9 December 2020
I believe I got this off of Craigslist. This H8 has the Z80 cpu
Contents
Images
Z80
8080
Boots
Serial number: n/a
Boards
HA8-6 Z80 CPU
Part number; 85-2609-11
U13 ROM marked XCONMOD maybe XCON.MOD
Heathkit HA8-6 Z80 CPU
Controller Board
Part number; 85-2204-1
H8-4 Multi Port Serial IO as Received
Notes
Boot from Older ROM
From a discussion on the SEBHC google group Glenn instructs on how to boot an older ROM.
You must have an early ROM. It was only later that Heath added single key boot (the early ROMs were developed before the H17 existed).
To boot you must set the Program Counter register manually to 030.000 and then hit GO, so:
REG (decimal points light up...)
PC (the “F” key, same as PC)
ALTER (the “D” key; decimal points flash)
0 3 0 0 0 0
ALTER (decimals stop flashing...)
GO (the “4” key)
Documentation
Assembly
Operation
File:Heath Zenith H17-floppy-595-2160-03.pdf
