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5X: one byte patch to default to 1 MHz

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mgcaret 2017-03-11 11:16:05 -08:00
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commit 9e5bce35ec
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11
rom5x/README.md
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@ -22,4 +22,15 @@ that we got there from BEEP1) and returns back to BEEP1.
Then, in only 6 bytes I can create two entry points that load the value into
A that we need for the reset or boot routines, and then jump to the above patch.
## Options
The options directory contains one or more subdirectories with optional patches
that change the default behavior of the Apple IIc Plus.
### Accelerator Reverse
The accelerator reverse patch is a 1-byte patch that causes the IIc Plus to boot up
at the normal speed.
Pressing <ESC> at reset time will make the machine run at 4 MHz.

8
rom5x/options/accel_reverse/B1_FDD5_accel_reverse.s Normal file
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@ -0,0 +1,8 @@
; this reverses the accelerator to always start off at 1MHz
; <ESC> at reset then selects 4 MHz
; This is useful if you spend more time at 1 MHz, for games
.text
* = $fdd5
.byte $f0